A spectroscopic orbit of RZ Cassiopeiae

Details A spectroscopic orbit of RZ Cassiopeiae A spectroscopic orbit of RZ Cassiopeiae

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...38..155d&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 38, Nov. 1979, p. 155-159.

Astronomy and Astrophysics

Astrophysics

15

Eclipsing Binary Stars, Orbit Calculation, Radial Velocity, Stellar Motions, Stellar Spectra, Algol, Circular Orbits, Orbital Elements, Stellar Envelopes, Velocity Measurement

Scientific paper

Radial-velocity measurements and a spectroscopic orbital solution based on 55 spectrograms obtained in the wavelength range from 3700 to 4600 A are presented for the Algol-type eclipsing binary RZ Cas. Recent period variations of RZ Cas are briefly discussed, and it is shown that peculiar features of the radial-velocity curves are most likely produced by circumstellar matter. A secondary/primary mass ratio of 0.35 is derived, along with a primary mass of 1.9 solar masses, a secondary mass of 0.65 solar mass, a primary radius of 1.47 solar radii, a secondary radius of 1.84 solar radii, and an orbital semimajor axis of 4.44 million km. It is concluded that the subgiant component nearly fills its Roche lobe, that the colors of RZ Cas are those of a slightly reddened A3 main-sequence star, and that the primary component is overluminous for its mass and will soon evolve away from the main sequence.

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