Photometry of ET Andromedae and pulsation of HD 219891

Weiss, W. W. and Kuschnig, R. and Mkrtichian, D. E. and Kusakin, A. V. and Kreidl, T. J. and Bus, S. J. and Osip, D. J. and Guo, Z. and Hao, J. and Huang, L. and Sareyan, J. P. and Alvarez, M. and Bedolla, S. G. and Zverko, J. and Ziznovsky, J. and Mittermayer, P. and Zwintz, K. and Polosukhina, N. and Mironov, A. V. and Dorokhov, N. I. and Goranskij, V. P. and Dorokhova, T. N. and Schneider, H. and Hiesberger, F. (1998) Photometry of ET Andromedae and pulsation of HD 219891. Astronomy & Astrophysics, 338 (3). pp. 919-922. ISSN 1432-0746

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Abstract

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(.)(d)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 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.

Item Type:	Article
Publisher’s Statement:	© 1998 Astronomy and Astrophysics. Published by EDP Sciences.
Keywords:	ap-stars; b-type stars; calibration; delta-scuti; effective temperatures; geneva photometry; mass; si; stars : binaries : spectroscopic; stars : chemically peculiar; stars : individual : ET And; stars : oscillations; stars : rotation
Subjects:	Q Science > QB Astronomy
NAU Depositing Author Academic Status:	Faculty/Staff
Department/Unit:	College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited:	30 Sep 2015 17:06
URI:	http://openknowledge.nau.edu/id/eprint/390

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