On the absence of ellipsoidal light variations in X Per

Details On the absence of ellipsoidal light variations in X Per On the absence of ellipsoidal light variations in X Per

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76..217m&link_type=abstract

Astronomy and Astrophysics, vol. 76, no. 2, July 1979, p. 217-220.

Astronomy and Astrophysics

Astrophysics

1

Binary Stars, Light Curve, Stellar Models, Stellar Radiation, Variability, X Ray Sources, Light Modulation, Mass Ratios, Roche Limit, Stellar Mass Accretion, Von Zeipel Method

Scientific paper

The implications of the absence of a 22.4-hr optical modulation for a binary model of the X-ray source X Per/4U 0352 + 30 are investigated by comparison with computed synthetic light curves. The computer program used for generating light curves improves previously published work by taking into proper account the dependence on several model parameters and large mass ratios. The results confirm evidence reported by Ferrari-Toniolo et al. (1977) that a model for X Per based on a primary overflowing its Roche lobe is untenable. To be consistent with the absence of optical modulation, Roche-lobe overflow may occur only if the primary to secondary mass ratio is larger than 170. Some considerations on the validity of Roche models for X Per and on ellipsoidal light curves in general are also given.

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