The Binary Type II Cepheids IX CAS and TX Del

Details The Binary Type II Cepheids IX CAS and TX Del The Binary Type II Cepheids IX CAS and TX Del

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..981h&link_type=abstract

Astronomical Journal v.98, p.981

Astronomy and Astrophysics

Astronomy

21

Stars: Cepheids, Stars: Binaries, Stars: Individual

Scientific paper

Radial-velocity observations show that the metal-rich Type II Cepheids IX Cas and TX Del are single-line spectroscopic binaries. Their orbital periods are found to be 110 and 133 days, respectively, and orbits are determined. Together with AU Peg, with a period of 53 days, there are now three Type II Cepheids known to have binary companions. All three stars appear to have binary separations near the minimum allowable for the size of the Cepheid, and all have probably undergone mass transfer during their evolution. The possible influence of mass transfer in causing these and other metal-rich stars to populate the instability strip is discussed.

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