Simultaneous differential photometry with the ST Andrews twin photometric telescope. II - The eclipsing binaries SX Aurigae and TT Aurigae

Details Simultaneous differential photometry with the ST Andrews twin photometric telescope. II - The eclipsing binaries SX Aurigae and TT Aurigae Simultaneous differential photometry with the ST Andrews twin photometric telescope. II - The eclipsing binaries SX Aurigae and TT Aurigae

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..649b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Feb. 1, 1987, p. 649-673.

Astronomy and Astrophysics

Astronomy

18

Eclipsing Binary Stars, Light Curve, Stellar Evolution, Stellar Spectrophotometry, Telescopes, Radial Velocity, Stellar Orbits

Scientific paper

Data from B photometric observations of SX Aur (obtained with the twin photometric telescope at St Andrews on four nights in February 1984 and January 1985) and medium-resolution 404 and 440-nm spectroscopic observations of SX Aur and TT Aur (obtained with the 2.5-m Isaac Newton Telescope on August 25-30, 1985) are presented in tables and graphs and analyzed by comparison with the evolutionary tracks of Hejlesen (1980). It is inferred that SX Aur is similar to V Pup, having a primary which has evolved into contact (after passing through Case A mass-ratio reversal) at temperature 25,000 K and chemical composition X = 0.70 and Z = 0.02. The TT Aur data are shown to be in agreement with those of Wachmann et al. (1986), indicating that TT Aur is a less evolved semidetached system with a near-ZAMS 23,600-K (X = 0.70; Z = 0.02) primary slightly smaller than the Roche-lobe-filling secondary. Both secondaries are found to be overluminous for their masses by about 0.8 mag.

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