Relevant bibliographies by topics / Stars: individual: eta Carinae

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Academic literature on the topic 'Stars: individual: eta Carinae'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Stars: individual: eta Carinae"

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Groh, Jose H. "Zooming into Eta Carinae with interferometry." Proceedings of the International Astronomical Union 9, S307 (2014): 267–72. http://dx.doi.org/10.1017/s1743921314006917.

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AbstractShaped by strong mass loss, rapid rotation, and/or the presence of a close companion, the circumstellar environment around the most massive stars is complex and anything but spherical. Here we provide a brief overview of the high spatial resolution observations of Eta Carinae performed with the Very Large Telescope Interferometer (VLTI). Special emphasis is given to discuss VLTI/AMBER and VLTI/VINCI observations, which directly resolve spatial scales comparable to those where mass loss originates. Studying scales as small as a few milli-arcseconds allows us to investigate kinematical e
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Gull, Theodore R., and Augusto Damineli. "JD13 – Eta Carinae in the Context of the Most Massive Stars." Proceedings of the International Astronomical Union 5, H15 (2009): 373–98. http://dx.doi.org/10.1017/s1743921310009890.

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Eta Car, with its historical outbursts, visible ejecta and massive, variable winds, continues to challenge both observers and modelers. In just the past five years over 100 papers have been published on this fascinating object. We now know it to be a massive binary system with a 5.54-year period. In January 2009, η Car underwent one of its periodic low-states, associated with periastron passage of the two massive stars. This event was monitored by an intensive multi-wavelength campaign ranging from γ-rays to radio. A large amount of data was collected to test a number of evolving models includ
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Baratta, Giovanni Battista, and Roberto Viotti. "Eta Carinae: UV constraints on possible models. The close binary hypothesis." International Astronomical Union Colloquium 113 (1989): 277–78. http://dx.doi.org/10.1017/s0252921100004619.

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η Car is one of the brightest stars in our Galaxy. For its luminosity, huge mass loss, large variability can be considered as an ideal laboratory to study the LBV phenomenon, and to give constraints on possible models of LBVs. We propose that η Car is a – possibly binary –F-type hypergiantwhose wind isheated by dissipation of mechanical energy.
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Groh, J. H. "Multi-dimensional Modeling of Massive Binary Interaction in Eta Carinae." Proceedings of the International Astronomical Union 7, S282 (2011): 259–60. http://dx.doi.org/10.1017/s1743921311027505.

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AbstractWe summarize recent efforts from our group to constrain the nature of both stars in the Eta Carinae binary system and its orbital parameters by studying the influence of the companion star on the spectrum of the primary star. We find that the cavity in the dense wind of the primary star strongly affects multi-wavelength diagnostics such as the ultraviolet spectrum, the optical hydrogen lines, and the shape of the near-infrared continuum region. These diagnostics have been previously interpreted as requiring a latitude-dependent wind generated by a fast-rotating primary star, but the ef
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Kashi, Amit. "Accretion simulations of Eta Carinae and implications to massive binaries." Proceedings of the International Astronomical Union 14, S346 (2018): 93–97. http://dx.doi.org/10.1017/s1743921319002059.

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AbstractUsing high resolution 3D hydrodynamical simulations we quantify the amount of mass accreted onto the secondary star of the binary system η Carinae during periastron passage on its highly eccentric orbit. The accreted mass is responsible for the spectroscopic event occurring every orbit close to periastron passage, during which many lines vary and the x-ray emission associated with the destruction wind collision structure declines. The system is mainly known for its giant eruptions that occurred in the nineteenth century. The high mass model of the system, M1=170M⊙ and M2=80M⊙, gives Ma
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Viotti, R., L. Rossi, A. Altamore, C. Rossi, and A. Cassatella. "New Results on Eta Carinae. Evidence for an Asymmetric, Inhomogeneous Wind." Symposium - International Astronomical Union 116 (1986): 249–52. http://dx.doi.org/10.1017/s0074180900149022.

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The very peculiar object Eta Car is one of the best laboratory for the study of those physical processes - such as mass loss, superionization, dust condensation, wind interaction with the i.s. medium - that presently are of great astrophysical interest, especially for the study of the most luminous stars. For its light history and high luminosity Eta Car may also be considered as the galactic counterpart of the Hubble-Sandage variables. Eta Car is one of the rare astrophysical objects with evidence of dust condensation from ejected stellar matter (Andriesse et al. 78) On the other side the sta
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Dufour, Reginald J. "Oxygen Depletion Variations in Planetary Nebulae and Shells Ejected from Luminous Population I Stars." Symposium - International Astronomical Union 131 (1989): 216. http://dx.doi.org/10.1017/s0074180900138288.

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Recent studies by the Peimberts have noted an anticorrelation between 0 and N abundances in the Type I He- and N-rich PN, such that N+) is approximately constant. We report observations of the spectra and composition of several “planetary nebula-like” shells surrounding more luminous population I O- and WR-stars, which indicate that this 0-N anticorrelation extends upwards in the HR diagram to among the most luminous stars known, with O/H values in the shells ranging down to −2 dex below Solar. We report optical and UV spectrophotometry of the shell nebulae NGC 2359, NGC 6164-5, NGC 6888, NGC
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Massey, Philip, and Jennifer Johnson. "Massive stars near Eta Carinae - The stellar content of TR 14 and TR 16." Astronomical Journal 105 (March 1993): 980. http://dx.doi.org/10.1086/116487.

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Madura, Thomas I., Theodore Gull, Mairan Teodoro, et al. "4-D Imaging and Modeling of Eta Carinae’s Inner Fossil Wind Structures." Proceedings of the International Astronomical Union 12, S329 (2016): 420. http://dx.doi.org/10.1017/s1743921317000291.

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AbstractEta Carinae is the most massive active binary within 10,000 light-years and is famous for the largest non-terminal stellar explosion ever recorded. Observations reveal that the supermassive (~120 M⊙) binary, consisting of an LBV and either a WR or extreme O star, undergoes dramatic changes every 5.54 years due to the stars’ very eccentric orbits (e ≈ 0.9). Many of these changes are caused by a dynamic wind-wind collision region (WWCR) between the stars, plus expanding fossil WWCRs formed one, two, and three 5.54-year cycles ago. The fossil WWCRs can be spatially and spectrally resolved
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Madura, Thomas, T. R. Gull, N. Clementel, et al. "3D time-dependent hydrodynamical and radiative transfer modeling of Eta Carinae’s innermost fossil colliding wind structures." Proceedings of the International Astronomical Union 14, S346 (2018): 62–66. http://dx.doi.org/10.1017/s1743921318007949.

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AbstractEta Carinae is the most massive active binary within 10,000 light-years. While famous for the largest non-terminal stellar explosion ever recorded, observations reveal a supermassive (∼120 M⊙) binary consisting of an LBV and either a WR or extreme O star in a very eccentric orbit (e=0.9) with a 5.54-year period. Dramatic changes across multiple wavelengths are routinely observed as the stars move about in their highly elliptical orbits, especially around periastron when the hot (∼40 kK) companion star delves deep into the denser and much cooler (∼15 kK) extended wind photosphere of the
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Dissertations / Theses on the topic "Stars: individual: eta Carinae"

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Wu, Ya-Lin, Nathan Smith, Laird M. Close, Jared R. Males, and Katie M. Morzinski. "Resolving the H alpha-emitting Region in the Wind of eta Carinae." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624482.

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The massive evolved star. Carinae is the most luminous star in the Milky Way and has the highest steady wind mass-loss rate of any known star. Radiative transfer models of the spectrum by Hillier et al. predict that Ha is mostly emitted in regions of the wind at radii of 6-60 au from the star (2.5-25 mas at 2.35 kpc). We present diffraction-limited images (FWHM similar to 25 mas) with Magellan adaptive optics in two epochs, showing that. Carinae consistently appears similar to 2.5-3 mas wider in Ha emission compared to the adjacent 643 nm continuum. This implies that the H alpha line-forming r
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Kiminki, Megan M., Megan Reiter та Nathan Smith. "Ancient eruptions of η Carinae: a tale written in proper motions". OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/622109.

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We analyse eight epochs of Hubble Space Telescope H alpha+[N ii] imaging of eta Carinae's outer ejecta. Proper motions of nearly 800 knots reveal that the detected ejecta are divided into three apparent age groups, dating to around 1250 A.D., to around 1550 A.D., and to during or shortly before the Great Eruption of the 1840s. Ejecta from these groups reside in different locations and provide a firm constraint that eta Car experienced multiple major eruptions prior to the nineteenth century. The 1250 and 1550 events did not share the same axisymmetry as the Homunculus; the 1250 event was parti
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Teodoro, Mairan Macedo. "Análise multi-espectral dos eventos cíclicos de Carinae." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-14012010-140113/.

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Nesta tese foi feito um estudo dos eventos cíclicos em Carinae em diversas faixas espectrais. A presença de um buraco na região polar do Homúnculo foi confirmada pelos mapas de velocidade da linha do [Fe II] 12567. A componente em emissão da linha do He I 10830, detectada na linha de visada do lóbulo NW e que apresenta velocidades negativas, foi mapeada e está contida no plano equatorial. Foi observado que durante um período de 206 dias, centrado na fase zero, a linha do He I 10830 apresenta um aumento na velocidade máxima da componente em absorção, atingindo 1800 km/s. Tal comportamento favo
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Smith, Nathan, Adam Ginsburg, and John Bally. "A disrupted molecular torus around Eta Carinae as seen in 12CO with ALMA." OXFORD UNIV PRESS, 2018. http://hdl.handle.net/10150/627134.

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We present Atacama Large Millimeter Array (ALMA) observations of (CO)-C-12 2-1 emission from circumstellar material around the massive star Eta Carinae (eta Car). These observations reveal new structural details about the cool equatorial torus located similar to 4000 au from the star. The CO torus is not a complete azimuthal loop, but rather, is missing its near side, which appears to have been cleared away. The missing material matches the direction of apastron in the eccentric binary system, making it likely that eta Car's companion played an important role in disrupting portions of the toru
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Teodoro, Mairan Macedo. "Espectroscopia de campo integral do Homúnculo de eta Carinae." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/14/14131/tde-12042006-105530/.

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Nesta dissertação são apresentados os resultados obtidos da espectroscopia de campo integral da nebulosa do Homúnculo. As observações foram feitas na banda J, no intervalo de 10620 Å até 12960 Å, utilizando o IFU (Integral Field Unit) do espectrógrafo CIRPASS (Cambridge Infrared Panoramic Survey Spectrograph), que possui 499 lentes hexagonais. A amostragem espacial é de 0,25"/lente e a resolução espectral, R=3200. A linha do [Fe II] λ12567 permitiu a identificação de duas estruturas no lóbulo NW que ainda não haviam sido relatadas. Através da tomografia Doppler, essas estruturas indicara
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Smith, Nathan. "A moderately precise dynamical age for the Homunculus of Eta Carinae based on 13 years of HST imaging." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/625797.

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The Hubble Space Telescope archive contains a large collection of images of eta Carinae, and this paper analyses those most suitable for measuring its expanding Homunculus Nebula. Multiple intensity tracings through the Homunculus reveal the fractional increase in the overall size of the nebula; this avoids registration uncertainty, mitigates brightness fluctuations, and is independent of previous methods. Combining a 13 yr baseline ofWide Field Planetary Camera 2 images in the F631N filter, with a 4 yr baseline of Advanced Camera for Surveys/ High Resolution Channel images in the F550M filter
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Dodson-Robinson, Sarah E., Kate Y. L. Su, Geoff Bryden, Paul Harvey, and Joel D. Green. "HERSCHEL OBSERVATIONS AND UPDATED SPECTRAL ENERGY DISTRIBUTIONS OF FIVE SUNLIKE STARS WITH DEBRIS DISKS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622672.

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Observations from the Herschel Space Observatory have more than doubled the number of wide debris disks orbiting Sunlike stars to include over 30 systems with R > 100 AU. Here we present new Herschel PACS and re-analyzed Spitzer MIPS photometry of five Sunlike stars with wide debris disks, from Kuiper belt size to R > 150 AU. The disk surrounding HD 105211 is well resolved, with an angular extent of >14" along the major axis, and the disks of HD 33636, HD 50554, and HD 52265 are extended beyond the PACS PSF size (50% of energy enclosed within radius 4.23"). HD 105211 also has a 24 mu m infrare
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Dorland, Bryan Currie Doug. "An Astrometric Analysis of eta Carinae's Eruptive History using HST WFPC2 and ACS Observations /." 2007. https://drum.umd.edu/dspace/handle/1903/7220.

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Books on the topic "Stars: individual: eta Carinae"

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HVEN, 2000 Conference (2000 Ven Island Sweden). Eta Carinae and other mysterious stars: The hidden opportunities of emission line spectroscopy : proceedings of an international conference held at Tycho Brahe's Island, Hven, Sweden, 24-26 August 2000. Astronomical Society of the Pacific, 2001.

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Humphreys, Roberta M., and Kris Davidson. Eta Carinae and the Supernova Impostors. Springer, 2014.

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Eta Carinae And The Supernova Impostors. Springer, 2012.

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Kris, Davidson, Gull Theodore R, and Johansson S. 1942-, eds. Eta Carinae and other mysterious stars: The hidden opportunities of emission line spectroscopy : proceedings of an international conference held at Tycho Brahe's Island, Hven, Sweden, 24-26 August 2000. Astronomical Society of the Pacific, 2001.

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Book chapters on the topic "Stars: individual: eta Carinae"

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Najarro, Francisco Paco, and D. John Hillier. "The Winds of Eta Carinae and Other Very Luminous Stars." In Eta Carinae and the Supernova Impostors. Springer US, 2012. http://dx.doi.org/10.1007/978-1-4614-2275-4_4.

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Davidson, Kris. "Giant Outbursts of the Eta Carinae - P Cygni Type." In Instabilities in Luminous Early Type Stars. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3901-1_8.

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Schulte-Ladbeck, Regina E., Anna Pasquali, Mark Clampin, Antonella Nota, John Hillier, and O. L. Lupie. "Imaging polarimetry of eta carinae with the hubble space telescope." In Variable and Non-spherical Stellar Winds in Luminous Hot Stars. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/bfb0106387.

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van Genderen, A. M., and P. S. Thé. "The light- and colour variation of Eta Carinae for the years 1983–1986 in the VBLUW system." In Instabilities in Luminous Early Type Stars. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3901-1_26.

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Metcalfe, David, and Harveer Dev. "Patient Focus." In Oxford Assess and Progress: Situational Judgement Test. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805809.003.0023.

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As a junior doctor, you are constantly pulled in different directions by multiple competing interests. These include those of your immediate bosses (possibly multiple consultants, a registrar, and an SHO), Educational Supervisors (Clinical Supervisor, Foundation Programme Director), fellow FY1 doctors, other healthcare professionals (nurses, physiotherapists), ancillary services (laboratory, radiology), patients’ relatives, representatives of the Trust (infection control, human resources, information technology), and many others. In amongst all of these is a patient, if not many, for whom all of these individuals are also working. It will not come as a surprise that Good Medical Practice (2013) states early on that you must ‘make the care of your patient your first concern’ and ‘treat patients as individuals and respect their dignity’. In addition, Good Medical Practice requires that you: ● listen to, and respond to, their concerns and preferences ● give patients the information they want or need in a way they can understand ● respect patients’ right to reach decisions with you about their treatment and care ● support patients in caring for themselves to improve and maintain their health. One challenge is when patients reach decisions that are contrary to the best available medical advice. The archetypal case in point is that of a Jehovah’s Witness at risk of life- threatening haemorrhage but refusing a blood transfusion. In such cases, remember that: ● you should never assume what someone’s beliefs are just because they come bearing a particular religious label. It is always right to ask the patient what they believe and what they will accept under different circumstances. For example, some Jehovah’s Witnesses will accept cell salvage and some blood substitutes ● seek advice early, particularly if the stakes are high (e.g. active bleeding). Your own seniors (SpR, consultant, etc.) and the on- call haematology team are good places to start. They may direct you to other resources that you might contact (with the patient’s consent) such as the Jehovah’s Witnesses’ Hospital Liaison Committee ● document all conversations (with the patient and colleagues) carefully ● ultimately, an adult patient with capacity has the right to refuse treatments— however much you disagree and even if this ultimately results in their death.
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