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Relevant bibliographies by topics / David Dunlap Observatory

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Academic literature on the topic 'David Dunlap Observatory'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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Journal articles on the topic "David Dunlap Observatory"

1

Fowler, Carlie, John Pluff, and Joshua Thomas. "Updated Orbit and Observations of Spectroscopic Binary HD 2019." Research Notes of the AAS 6, no. 10 (October 17, 2022): 211. http://dx.doi.org/10.3847/2515-5172/ac99e1.

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Abstract Binary star system HD 2019 was studied by the David Dunlap Observatory between 1935 and 1947. From the spectroscopic data obtained, the orbital elements of the system were defined. Between then and now, there have been no updated studies of this binary star system. We set out to update the orbit of HD 2019 with new spectroscopic data obtained at Clarkson University's Reynolds Observatory. After finding the radial velocities of the star or stars visible in each spectrum, estimates of the error for each measurement were made. From the radial velocities and error estimates, new orbital elements were fit using the data from David Dunlap Observatory combined with the new data collected at Clarkson. These results lead to further investigation of the eccentricity of the orbit. Using the method of Lucy 2005, we ran a test to check the statistical significance of the eccentric orbit using p-value testing.

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2

Chu, Y.-H., C. M. Clement, H. Sawyer Hogg, and T. R. Wells. "Two Mid-Giant Branch Stars in M15." International Astronomical Union Colloquium 82 (1985): 264–67. http://dx.doi.org/10.1017/s0252921100109480.

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AbstractHigh precision photographic photometry indicates that two stars lying on the giant branch in the C-M diagram of M15 are small amplitude (~0.2 mag) variables. The two stars are Kustner 64 and 152. This investigation is based on plates taken with three telescopes: the Dominion Astrophysical Observatory 1.8-metre reflector, the David Dunlap 1.9-metre reflector and the Yunnan 1-metre reflector in China. The existing data is not sufficient for period determination.

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Wehlau, Amelia, Philip Rice, Marcia Wehlau, and Helen Sawyer Hogg. "The LongTerm Behaviour of Two Pulsating Variables in M56." International Astronomical Union Colloquium 82 (1985): 284–87. http://dx.doi.org/10.1017/s0252921100109534.

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Of twelve variables known in Messier 56 in Lyra, two, V1 and V6 are the subject of this paper. VI was discovered by Shapley (1920) and first determined by Sawyer Hogg (1942) to be a Cepheid with a period of 1.5 days. V6 was discovered by Sawyer Hogg (1940) from her early plates at the David Dunlap Observatory. Later Sawyer Hogg (1949) showed it to be an RV Tauri type with a period of 90.02 days, one of the first such to be identified in a globular cluster. A.H.Joy (1949) determined spectral type and radial velocity for both of these variables.

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Bishop, Roy L. "The R.A.S.C. Observer’s Handbook." International Astronomical Union Colloquium 105 (1990): 225–26. http://dx.doi.org/10.1017/s0252921100086826.

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Except for two years, 1909 and 1910, the Observer’s Handbook of The Royal Astronomical Society of Canada has been published every year since 1907. It was founded by Clarence Augustus Chant, who also was responsible for the founding at the University of Toronto, of Canada’s first and largest department of astronomy, and who established the David Dunlap Observatory, which contains the largest optical telescope in Canada. In addition, Chant served as Editor of the Observer’s Handbook for 50 years, which is the main reason I am only the fourth editor since 1907. I should mention that John Percy, Chairman of the Scientific Organizing Committee of this Colloquium, was the third editor.

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5

Clement, C., H. Sawyer Hogg, and T. Wells. "Eight PopII Cepheids Recently Identified in Globular Clusters." International Astronomical Union Colloquium 82 (1985): 262–63. http://dx.doi.org/10.1017/s0252921100109479.

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The University of Toronto 24-inch telescope at the Las Campanas Observatory of the Carnegie Institution of Washington has beerused for the study of variables in four southern globular clusters: NGC 6273=1119, NGC 6284, NGC 6293 and NGC 6333-M9.The first three of these clusters lie about 2° from one another in the sky at southern declinations ranging from about 24.5° to 26.5°. They were investigated by one of us (Sawyer 1943) using photographs obtained at the Steward Observatory in Arizona in 1939. A number of variables were discovered, but even with additional David Dunlap plates, it was not possible to determine any periods because of the large southern declinations. At Las Campanas (latitude 29°S), they pass close to the zenith and therefore the periods are more readily determined. From our Las Campanas data, we have found that there are four Cepheids in NGC 6273, two in NGC 6284 and one in NGC 6293.

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6

Clement, C., H. Sawyer Hogg, and K. Lake. "Two PopII Cepheids in the Globular Cluster M10." International Astronomical Union Colloquium 82 (1985): 260–61. http://dx.doi.org/10.1017/s0252921100109467.

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The globular cluster Messier 10 has three known variables. The first two of these were discovered by one of us (Sawyer 1933) and the third by Arp (1955). Two of the variables, V2 (P=18.7226) and V3 (P=7.831), are population II cepheids while V1 appears to be an irregular variable. Another star which lies in the Schwarzschild gap on the horizontal branch is a suspected variable (Voroshilov 1971).In this investigation, we examine the variations in the periods of the two cepheids over the interval 1912 to 1983 (for V2) and 1931 to 1983 (for V3). The study is based on photographs obtained with seven different telescopes - the Mt.Wilson 100-inch and 60-inch (1912 to 1919), the Dominion Astrophysical Observatory 72-inch, the David Dunlap 74-inch and 19-inch, the 16-inch at the University of Toronto downtown campus and the University of Toronto 24-inch at the Las Campanas Observatory of the Carnegie Institution of Washington. Some of our magnitudes have already been published (Sawyer 1938) and the remaining ones will be submitted to the Astronomical Journal for publication. We have also included material published by Arp (1955, 1957) in our study.

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Books on the topic "David Dunlap Observatory"

1

Observatory, David Dunlap. David Dunlap Observatory Logbook, September 1994- November 1994. Nabu Press, 2011.

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2

Observatory, David Dunlap. David Dunlap Observatory Logbook, August 1981-July 1982. Palala Press, 2015.

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3

Observatory, David Dunlap. Publications of the David Dunlap Observatory- University of Toronto. Arkose Press, 2015.

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Observatory, David Dunlap. Publications of the David Dunlap Observatory- University of Toronto: 2. Creative Media Partners, LLC, 2018.

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Observatory, David Dunlap. Publications of the David Dunlap Observatory- University of Toronto: 1. Creative Media Partners, LLC, 2018.

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6

Observatory, David Dunlap. David Dunlap Observatory Logbook, June 1977-April 1978: 51,, Plate Nos. 41672-42538. Creative Media Partners, LLC, 2018.

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7

Observatory, David Dunlap. David Dunlap Observatory Logbook, July 1939-March 1940: 7, July 1939-March 1940, Plate Nos. 4743-5494. Creative Media Partners, LLC, 2018.

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8

Observatory, David Dunlap. David Dunlap Observatory Logbook, September 1941- September 1942: 10, September 1941- September 1942, Plate Nos. 7117-8229. Creative Media Partners, LLC, 2018.

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9

Observatory, David Dunlap. David Dunlap Observatory Logbook, June 1993-November 1993: 74, June 1993-November 1993, Plate Nos. 15029-16942. Creative Media Partners, LLC, 2018.

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10

Observatory, David Dunlap. David Dunlap Observatory Logbook, November 1993-March 1994: 75, November 1993-March 1994, Plate Nos. 16943-20408. Creative Media Partners, LLC, 2018.

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