Absolute dimensions of eclipsing binaries. XII - TZ Mensae

Details Absolute dimensions of eclipsing binaries. XII - TZ Mensae Absolute dimensions of eclipsing binaries. XII - TZ Mensae

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175...60a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 60-70. Research supported by the Statens Naturvid

Astronomy and Astrophysics

Astrophysics

18

A Stars, Eclipsing Binary Stars, Main Sequence Stars, Size Determination, Stellar Mass, Stellar Spectra, Astronomical Photometry, Orbital Elements, Stellar Evolution, Stellar Orbits, Stellar Rotation

Scientific paper

A definitive redetermination of the masses and radii of the bright early A-type eclipsing binary TZ Men has been made, based on an analysis of 36 high dispersion coudé spectrograms and of complete uvby light curves, each containing 864 points. The components are of considerably different mass, radius, temperature, and luminosity, the masses (2.5 and 1.5 M_sun;) and radii (2.0 and 1.4 R_sun;) being determined to a precision of about 1%. Both stars are situated in the lower part of the main-sequence band with an estimated age of 108yr. Slight night-to-night photometric variability, of unidentified type, is ascribed to the secondary component. The rotation of the components, uncertain for the faint secondary, appears to be synchronous. Calculation of the expected apsidal motion shows it to be dominated by the general relativistic term, but observable effects appear to be undetectable within a practicable span of time.

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