Photometric study of the W UMa eclipsing binaries VW LMi and BX Dra

• Published in: Astrophysics and space science Vol. 312; no. 3-4; pp. 151 - 159
• Main Authors: Sanchez-Bajo, F, Garcia-Melendo, E, Gomez-Forrellad, J M
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.12.2007
• Subjects: Astrophysics; Contact; Double stars; Eclipsing binary stars; Luminosity; Minima; Spectroscopic analysis; Spectroscopy; Spectrum analysis; Stars & galaxies
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/s10509-007-9668-4

New ephemeris and the absolute parameters--masses, radii and luminosities--of the contact systems VW LMi and BX Dra have been obtained, by means of the analysis of the minima data available in the literature (for the determination of the ephemeris) and combining the previously published spectroscopic information and the results of the Wilson-Devinney method using photometric data (for the determination of the absolute parameters). The VW LMi O-C analysis confirms the multiplicity of the system detected previously from the spectroscopic data. Masses of the VW LMi contact system primary and secondary components are 1.67 c 0.02M sub() and 0.70 c 0.02M sub(), respectively. The corresponding radii are 1.709 c 0.007R sub() and 1.208 c 0.006R sub(), respectively. For the BX Dra contact system the masses are 2.19 c 0.13M sub() and 0.63 c 0.06M sub(), and the radii, 2.13 c 0.04R sub() and 1.26 c 0.03R sub(), for the primary and secondary, respectively. In both cases, the estimated luminosities seem to be slightly greater that the values derived from the Hipparcos distances.