1998A&A...338..919W

Query : 1998A&A...338..919W

1998A&A...338..919W - Astronomy and Astrophysics, volume 338919-922 (1998/10-3)

Photometry of ET Andromedae and pulsation of HD 219891.

WEISS W.W., KUSCHNIG R., MKRTICHIAN D.E., KUSAKIN A.V., KREIDL T.J., BUS S.J., OSIP D.J., GUO Z., HAO J., HUANG L., SAREYAN J.-P., ALVAREZ M., GONZALEZ-BEDOLLA S., ZVERKO J., ZIZNOVSKY J., MITTERMAYER P., ZWINTZ K., POLOSUKHINA N., MIRONOV A.V., DOROKHOV N.I., GORANSKIJ V.P., DOROKHOVA T.N., SCHNEIDER H. and HIESBERGER F.

Abstract (from CDS):

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 1.618875d 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 10.0816d–1, a semi-amplitude of 2.5mmag, Teff and Mv suggest this comparison star to be a δScuti 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.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: spectroscopic - stars: chemically peculiar - stars: individual: ET And - stars: oscillations - stars: rotation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 218525 * 23 08 12.4165501632 +44 33 42.654171384   6.665 6.513     A2IV 27 0
2 HD 219668 PM* 23 17 16.6735839312 +45 09 51.000175260   7.533 6.455     K0IV 45 0
3 V* ET And a2* 23 17 56.0115388728 +45 29 20.119357248   6.447 6.479     A0VpSiSr 151 0
4 HD 219891 dS* 23 19 02.4129346656 +45 08 12.297468732 6.800 6.670 6.510     A5Vn 50 0

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