Four-colour photometry of eclipsing binaries. XXVI A - RY Aqr: A low-mass semidetached system with intrinsic variability

Details Four-colour photometry of eclipsing binaries. XXVI A - RY Aqr: A low-mass semidetached system with intrinsic variability Four-colour photometry of eclipsing binaries. XXVI A - RY Aqr: A low-mass semidetached system with intrinsic variability

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172..155h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 155-166. Research supported by the Danish Board fo

Astronomy and Astrophysics

Astrophysics

15

Eclipsing Binary Stars, Electrophotometry, Spectrum Analysis, Stellar Evolution, Stellar Spectrophotometry, Ubv Spectra, Early Stars, F Stars, Main Sequence Stars, Stellar Magnitude, Stellar Models, Variable Stars

Scientific paper

The first photoelectric analysis is presented of new uvby light curves (Helt, 1986) of the variable star RY Aquarii. RY Aqr is a double-lined, eclipsing binary consisting of a late A/early F main sequence star and an early K subgiant. The analysis is based on an improved determination of the dimensions from the light curves combined with the spectroscopic results from Popper. The analysis is complicated by intrinsic variability, leading to an accuracy in the radii of about 3 percent and in the masses of 4-5 percent. The hotter star has an unusually low mass (1.27 solar masses) and may be slightly metal deficient (Fe/H = -0.4). Its empirical log g value is large (4.33) so that the star lies close to the ZAMS. The photometrically best fitting solution leads to a volume for the K subgiant that is a few percent smaller than its available Roche lobe volume.

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