A study of two spectroscopic binary systems

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dc.contributor.authorRosvick, Joanne Marieen_US
dc.date.accessioned2024-08-15T17:41:47Z
dc.date.available2024-08-15T17:41:47Z
dc.date.copyright1990en_US
dc.date.issued1990
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractStromgren uvby photometry of the spectroscopic-visual triple system 20 Leonis was obtained at the San Diego State University's Mount Laguna Observatory. The 8 Scuti visual component was found to have only one period of 0.0826 days , although another may be present in the data. The close pair was found to undergo grazing eclipses from which an inclination of 75 ± 1 degrees was tentatively determined. The close pair's radial ve­locities obtained from the Dominion Astrophysical Observatory's 48 inch telescope were combined with Fekel and Bopp's (1977) velocities and new orbital elements were calculated. Spectroscopic observations of the visual component also showed that there has been an observable change in the system since 1977. High dispersion (2.4 A/mm) photographic spectra of the composite spectrum binary a Equulei were reduced using the ARCTURUS measur­ing machine for the G component's spectrum, and a radial velocity cross­-correlation package within IRAF for the A component's spectrum, to ob­tain new orbital elements and investigate the awkward possibility that the evolved G star is less massive than the main sequence A star. It was found that subtraction of the G star's contribution to the composite spectrum be­fore cross-correlation gave consistently better results than cross-correlation alone. New orbital elements were calculated and it was determined that the mass ratio Ma/MA is equal to 1.149 ± 0.046. Thus the mass of the evolved star is greater than that of its companion as expected from evolutionary considerations.
dc.format.extent115 pages
dc.identifier.urihttps://hdl.handle.net/1828/19522
dc.rightsAvailable to the World Wide Weben_US
dc.titleA study of two spectroscopic binary systemsen_US
dc.typeThesisen_US

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