Photometry of ET Andromedae and pulsation of HD 219891

Autor(en)
Werner Wolfgang Weiss, Rainer Kuschnig, David E. Mkrtichian, A V Kusakin, Tobias J N Kreidl, Schelte J. Bus, David J. Osip, Zhiyu Y. Guo, Jinxin X. Hao, Liangren R. Huang, Jean Pierre Sareyan, M Alvarez, S G Bedolla, J Zverko, Jozef Ziznovsky, Peter Mittermayer, Konstanze Zwintz, Nina Polosukhina, Aleksey V. Mironov, N I Dorokhov, Vitaly P. Goranskij, Tatyana N Dorokhova, Hartmut Schneider, Felicitas Hiesberger
Abstrakt

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 1d.618875 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 10.0816-1, a semi-amplitude of 2.5 mmag, Teff and Mv suggest this comparison star to be a d 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.

Organisation(en)
Institut für Astrophysik
Externe Organisation(en)
Odessa Astronomical Observatory, Lomonosov Moscow State University (MSU), Northern Arizona University, Peking University, Chinese Academy of Sciences (CAS), Université Côte d'Azur, Observatorio Astronomico Nacional (IA-UNAM), Universidad Nacional Autonoma de Mexico, Slovenian Academy of Sciences and Arts, Crimean Astrophysical Observatory, Max-Planck-Institut für Astronomie
Journal
Astronomy & Astrophysics
Band
338
Seiten
919-922
Anzahl der Seiten
4
ISSN
0004-6361
Publikationsdatum
1998
Peer-reviewed
Ja
ÖFOS 2012
103003 Astronomie
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/photometry-of-et-andromedae-and-pulsation-of-hd-219891(fb5b58f5-ad5a-499a-8fad-53eb7fbb5c47).html