Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1221m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1221-1228. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
11
Eclipsing Binary Stars, Stellar Evolution, Stellar Spectrophotometry, Curve Fitting, Light Curve, Radial Velocity, Stellar Mass, Stellar Models
Scientific paper
The star FO Vir, a recently discovered eclipsing binary with a period of 0.776 days, has been observed photometrically and spectroscopically. Light-curve and line-profile synthesis shows that FO Vir is semidetached with a mass ratio of 0.15 + or - 0.02. The A7 V primary component very nearly fills its Roche lobe. Radial velocities from the observed and synthesized profiles have been measured by cross correlation. The theoretical radial-velocity curve fits the observations well, to yield a mass of 1.9 + 0.9 or - 0.6 solar mass for the primary and 0.29 + 0.08 or - 0.06 solar mass for the secondary. The mean density is 0.17 + or - 0.02 g/cu cm for the primary, 0.33 + or - 0.03 g/cu cm for the secondary, with log g about 3.9 and Mv about 1.7 for the primary. This suggests the primary has evolved off the zero-age main sequence, while the secondary has a density that shows that for its mass it is highly evolved. The period and mass ratio are typical of the more extreme 'A-type' W UMa systems, which suggests that FO Vir will evolve into a contact binary of this type. Short-period semidetached binaries may be the progenitors of at least some W UMa systems.
Fernie Donald J.
Gray Richard O.
Lyons Ron
Mochnacki Stefan Wladyslaw
Schmidt Fred H.
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