SIMBAD references

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 M_☉, evolved, Helium-burning star, which fills its Roche lobe, to a 3.48 M_☉ 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) ×10^{-10}. We derive a lower limit to the mass loss rate from the primary star of {dot}M_1 ∼-4.4(±0.1) ×10^{-7} M_☉∼yr^{-1}. V∼Sge appears to be in a short-lived evolutionary state with a lifetime of ∼2 ×10^6∼yr.(c) Astronomical Society of the Pacific