Studies of early-type varaible stars. VII. The orbit and physical parameters for TV Cassiopeiae.
Abstract
From a new spectroscopic orbit of the Algol system TV Cas, based on Reticon observations, we find: V(o) = -4.1 +/- 0.8 km/s, K(p) = 86.1 +/- 1.0 km/s and K(s) = 212.9 +/- 3.6 km/s, and m(p)/m(s) = 2.47 +/- 0.05. This measurement of the mass ratio is the first reliable determination but confirms Plaskett's detection of the secondary. The velocity measures themselves are based on fitting theoretical profiles generated by a physical model of the binary, to the observed cross-correlation function. Such profiles match this function very well, much better in fact than Gaussian profiles which are generally used. FWHM measures of the secondary's ccf indicate a rotational velocity of 60 km/s only two-thirds that of synchronism. This result must be checked by measures of the Rossiter effect within secondary eclipse or by direct line measures of the, as yet, unseen secondary spectrum.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1992
- Bibcode:
- 1992A&A...257..199K
- Keywords:
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- Early Stars;
- Eclipsing Binary Stars;
- Stellar Orbits;
- Stellar Systems;
- Variable Stars;
- Interstellar Extinction;
- Radial Velocity;
- Stellar Mass;
- Stellar Models;
- Stellar Rotation;
- Astrophysics