Z Lac: Orbital Circularization in Supergiants

Details Z Lac: Orbital Circularization in Supergiants Z Lac: Orbital Circularization in Supergiants

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1670s&link_type=abstract

Astronomical Journal v.112, p.1670

Astronomy and Astrophysics

Astronomy

13

Stars: Individual: Z Lac, Cepheids

Scientific paper

We have obtained new radial velocities for the binary Cepheid Z Lac. These data have been combined with new velocities by Imbert (1996) and other data in the literature to derive an orbit. The orbital period is close to a year, making Z Lac the Cepheid with the shortest orbital period known. It is also the only Cepheid with an orbital eccentricity indistinguishable from zero. Comparison between the projected semi-major axis and the radii of S and 7 Msun stars at the tip of the red giant branch [from the evolutionary tracks of Schaller et al. (1992)] indicates that the orbit was probably circularized during the red giant phase.

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