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Dissertations / Theses on the topic 'Brightest Stars'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Wu, Ya-Lin, Laird M. Close, Jinyoung Serena Kim, Jared R. Males, and Katie M. Morzinski. "The Intricate Structure of HH 508, the Brightest Microjet in the Orion Nebula." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/627097.

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We present Magellan adaptive optics Ha imaging of HH 508, which has the highest surface brightness among protostellar jets in the Orion Nebula. We find that HH 508 actually has a shorter component to the west, and a longer and knotty component to the east. The east component has a kink at 0.'' 3 from the jet-driving star theta(1) Ori B-2, so it may have been deflected by the wind/radiation from the nearby theta(1) Ori B1B5. The origin of both components is unclear, but if each of them is a separate jet, then theta(1) Ori B-2 may be a tight binary. Alternatively, HH 508 may be a slow-moving out

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2

Boyajian, Tabetha S., Roi Alonso, Alex Ammerman, et al. "The First Post-Kepler Brightness Dips of KIC 8462852." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/626540.

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We present a photometric detection of the first brightness dips of the unique variable star KIC 8462852 since the end of the Kepler space mission in 2013 May. Our regular photometric surveillance started in 2015 October, and a sequence of dipping began in 2017 May continuing on through the end of 2017, when the star was no longer visible from Earth. We distinguish four main 1%-2.5% dips, named "Elsie," "Celeste," "Skara Brae," and " Angkor," which persist on timescales from several days to weeks. Our main results so far are as follows: (i) there are no apparent changes of the stellar spectrum

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3

Jeffers, Sandra Victoria. "Surface brightness distributions of late-type stars." Thesis, University of St Andrews, 2005. http://hdl.handle.net/10023/12941.

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The aim of this work has been to increase our understanding of the surface brightness distributions of late-type stars through Doppler imaging and eclipse mapping techniques. Combining spectroscopic and photometric observations with the technique of Doppler Imaging, I have reconstructed surface images of the G2V star He 699 (for 08 October 2000), which show high latitude and polar structures. In the case of the KOV star AB Dor, the Doppler images for January 1992 and November 1993 show a large polar cap with small dark features also present at intermediate to high latitudes. As the phase sampl

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4

Canning, Rebecca Elizabeth Ann. "Star and filament formation in brightest cluster galaxies." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610523.

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5

Harris, William E., Stephanie M. Ciccone, Gwendolyn M. Eadie, et al. "GLOBULAR CLUSTER SYSTEMS IN BRIGHTEST CLUSTER GALAXIES. III. BEYOND BIMODALITY." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/622870.

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We present new deep photometry of the rich globular cluster (GC) systems around the Brightest Cluster Galaxies UGC 9799 (Abell 2052) and UGC 10143 (Abell 2147), obtained with the Hubble Space Telescope (HST) ACS and WFC3 cameras. For comparison, we also present new reductions of similar HST/ACS data for the Coma supergiants NGC 4874 and 4889. All four of these galaxies have huge cluster populations (to the radial limits of our data, comprising from 12,000 to 23,000 clusters per galaxy). The metallicity distribution functions (MDFs) of the GCs can still be matched by a bimodal-Gaussian form whe

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6

Kim, Ji Hoon. "The star formation history of low surface brightness galaxies." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7646.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Astronomy. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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7

Pickering, Timothy Edward 1970. "Kinematics and star formation properties of low surface brightness galaxies." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282756.

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We present detailed studies of the kinematics and star formation properties of low surface brightness (LSB) galaxies. A total of five giant LSB galaxies including the prototype, Malin 1, were imaged in the 21-cm line of H sc I to provide the first glimpse into the kinematics of these systems. We find that these are some of the first examples to be uncovered of galaxies that are both massive and dark matter dominated. We also find that most of the galaxies have gas surface densities that lie below the critical density for star formation at all radii, consistent with their lack of star formation

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8

Amazo, Gomez Eliana Maritza [Verfasser]. "Understanding the brightness variations of Sun-like stars on timescales of stellar rotation / Eliana Maritza Amazo Gomez." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1225556074/34.

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9

Cañameras, Raoul. "Zooming in on star formation in the brightest galaxies of the early universe discovered with the Planck and Herschel satellites." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS237/document.

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Les galaxies amplifiées par lentillage gravitationnel fort offrent une opportunité exceptionnelle pour caractériser la formation stellaire intense au sein des galaxies poussiéreuses les plus distantes. Dans les cas les plus favorables, il est possible d'étudier les mécanismes qui régissent la formation stellaire jusqu'aux échelles des régions de formation d'étoiles individuelles. Les alignements fortuits entre ces galaxies actives et des structures d'avant-plan produisant des facteurs d'amplification par lentillage gravitationnel >> 10 restent néanmoins très rares. L'échantillon des Plan

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10

Mitzkus, Martin [Verfasser], Martin M. [Akademischer Betreuer] Roth, and C. Jakob [Akademischer Betreuer] Walcher. "Spectroscopic surface brightness fluctuations : probing bright evolved stars in unresolved stellar populations / Martin Mitzkus ; Martin M. Roth, C. Jakob Walcher." Potsdam : Universität Potsdam, 2017. http://d-nb.info/121840325X/34.

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11

Bouquin, Alexandre Y. K., de Paz Armando Gil, Juan Carlos Muñoz-Mateos, et al. "The GALEX/S4G Surface Brightness and Color Profiles Catalog. I. Surface Photometry and Color Gradients of Galaxies." IOP PUBLISHING LTD, 2018. http://hdl.handle.net/10150/627045.

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We present new spatially resolved surface photometry in the far-ultraviolet (FUV) and near-ultraviolet (NUV) from images obtained by the Galaxy Evolution Explorer (GALEX) and IRAC1 (3.6 mu m) photometry from the Spitzer Survey of Stellar Structure in Galaxies (S(4)G). We analyze the radial surface brightness profiles mu(FUV), mu(NUV), and mu[3.6], as well as the radial profiles of (FUV - NUV), (NUV -[3.6]), and (FUV -[3.6]) colors in 1931 nearby galaxies (z < 0.01). The analysis of the 3.6 mu m surface brightness profiles also allows us to separate the bulge and disk components in a quasi-auto

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12

Hill, David T. "The optical and NIR luminous energy output of the Universe : the creation and utilisation of a 9 waveband consistent sample of galaxies using UKIDSS and SDSS observations with the GAMA and MGC spectroscopic datasets." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1696.

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Theories of how galaxies form and evolve depend greatly on constraints provided by observations. However, when those observations come from different datasets, systematic offsets may occur. This causes difficulties measuring variations in parameters between filters. In this thesis I present the variation in total luminosity density with wavelength in the nearby Universe (z<0.1), produced from a consistent reanalysis of NIR and optical observations, taken from the MGC, UKIDSS and SDSS surveys. I derive luminosity distributions, best-fitting Schechter function parameterisations and total luminos

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13

Bildfell, Christopher John. "The Stellar Content in Clusters of Galaxies." Thesis, 2013. http://hdl.handle.net/1828/4562.

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We investigate three separate topics associated with the formation and evolution of the stellar mass component in galaxy clusters. The work presented herein is based primarily on optical imaging and spectra taken with, respectively, the Canada-France-Hawaii Telescope and Gemini North/South. We confront the result from the optical data analysis with the results from the analysis of high-resolution X-ray data taken with the Chandra and XMM-Newton space observatories. Confirming earlier results, we find that 22% of brightest cluster galaxies (BCGs) show central inversions in their optical colo

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14

Amazo, Gomez Eliana Maritza. "Understanding the brightness variations of Sun-like stars on timescales of stellar rotation." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1552-7.

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El brillo solar varía en escalas de tiempo de minutos a décadas. En particular, la variabilidad fotométrica observada puede relacionarse directamente con el período de rotación. Nuestro conocimiento de este vínculo permite extrapolaciones desde el Sol a otras estrellas. Incluso después de los exitosos estudios estelares logrados por las misiones Kepler o TESS, todavía hay una falta de información en los registros fotométricos de los períodos de rotación de estrellas similares al Sol. Los perfiles de curvas de luz no periódicas, la amplitud de modulación baja (los generados por la aparición ale

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15

Haberzettl, Lutz [Verfasser]. "Star formation history of low surface brightness galaxies in the HDF-S / von Lutz Haberzettl." 2005. http://d-nb.info/978298071/34.

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16

Thorat, Kshitij. "The Cosmic Population of Extended Radio Sources : A Radio-Optical Study." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2690.

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This thesis presents studies of cosmic populations of extragalactic radio sources. The problems selected for this thesis are 1) the derivation of constraints on the emergence of new sub-mJy populations at flux density below about 1mJy (at1.4 GHz) paying careful attention to including sources with low surface brightness and counting sources rather than components 2) development of a new method to estimate the asymmetry in the large scale galaxy environment with respect to the axes of extended radio sources and use this to examine for evidence of impact of the environment on the morphology of ra

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17

Thorat, Kshitij. "The Cosmic Population of Extended Radio Sources : A Radio-Optical Study." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2690.

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This thesis presents studies of cosmic populations of extragalactic radio sources. The problems selected for this thesis are 1) the derivation of constraints on the emergence of new sub-mJy populations at flux density below about 1mJy (at1.4 GHz) paying careful attention to including sources with low surface brightness and counting sources rather than components 2) development of a new method to estimate the asymmetry in the large scale galaxy environment with respect to the axes of extended radio sources and use this to examine for evidence of impact of the environment on the morphology of ra

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