Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109.1351m&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.109, p.1351-1358
Astronomy and Astrophysics
Astronomy
11
Stars: Peculiar, Novae
Scientific paper
High-speed photometric UBV observations of the nova-like variable V Sagittae conducted during 1994 and 1995 are reported. The data consist of a total of 152 hours of observations, covering the entire 12.3 hr orbital period. Analysis of the photometry using the new Wilson eclipsing-binary code suggests a model where mass is being transferred from a 0.86 Msun, evolved, Helium-burning star, which fills its Roche lobe, to a 3.48 Msun evolved companion. Thirteen new timings of primary eclipse in conjunction with published timings from 1946 to 1996 show that the orbital period is changing at a rate dot {P} = -5.1(+/- 1.0) x 10(-10) . We derive a lower limit to the mass loss rate from the primary star of dot {M_1} ~ -4.4(+/- 0.1) x 10(-7) Msun yr(-1) . V Sge appears to be in a short-lived evolutionary state with a lifetime of ~ 2 x 10(6) yr. (SECTION: Stars)
Mader Jeff
Shafter Allen
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