Photometry of ET Andromedae and pulsation of HD 219891

Details Photometry of ET Andromedae and pulsation of HD 219891 Photometry of ET Andromedae and pulsation of HD 219891

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338..919w&link_type=abstract

Astronomy and Astrophysics, v.338, p.919-922 (1998)

Astronomy and Astrophysics

Astrophysics

11

Stars: Binaries: Spectroscopic, Stars: Chemically Peculiar, Stars: Individual: Et And, Stars: Oscillations, Stars: Rotation

Scientific paper

ET And is a binary system with a B9p(Si) star as the main component. We report on the photometric observing campaigns in 1988, 1989 and 1994 which confirmed the rotation period of 1.618875 deg for ET And while refuting other published values. Furthermore, the controversial issue of pulsational stability of ET And is resolved since we have discovered pulsation for HD 219891, which was the main comparison star and sometimes exclusively used. The frequency of 10.0816 d(-1) , a semi-amplitude of 2.5 mmag, T_eff\ and M_v suggest this comparison star to be a delta Scuti variable close to the blue border of the instability strip. The pulsational stability of ET And could be clearly established and hence no need exists to derive new driving mechanisms for stars between the classical instability strip and the region of slowly pulsating B-type (SPB) stars. Based on observations obtained at the Bulgarian National Observatory, Crimean Astrophysical Observatory (Ukraine), Lowell Observatory (USA), Mauna Kea (USA), Mt. Dushak-Erekdak (Turkmenistan), San Pedro (Mexico), Skalnate Pleso (Slovakia), Tien Shan (Kazakhstan) and Wise Observatory (Israel)

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