The binary Cepheid AU Peg

Details The binary Cepheid AU Peg The binary Cepheid AU Peg

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1598h&link_type=abstract

Astronomical Journal, vol. 84, Oct. 1979, p. 1598-1602.

Astronomy and Astrophysics

Astronomy

9

Astronomical Photometry, Astronomical Spectroscopy, Binary Stars, Cepheid Variables, Light Curve, Ubv Spectra, Velocity Distribution

Scientific paper

A photometric and spectroscopic study of the Type II Cepheid AU Pegasi indicates it is a member of a binary with a period of no more than about 50 days. Constraints on the orbit indicate the companion is likely to be more massive than AU Peg and may be a compact object. The light curve, pulsation-velocity curve, and spectrum of AU Peg are consistent with its Cepheid nature. However, the colors are peculiar, and the large period changes remain to be explained.

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