2006A&A...449..305A


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.06CEST03:03:58

2006A&A...449..305A - Astronomy and Astrophysics, volume 449, 305-311 (2006/4-1)

Multiperiodicity in the large-amplitude rapidly-rotating βCephei star HD203664.

AERTS C., DE CAT P., DE RIDDER J., VAN WINCKEL H., RASKIN G., DAVIGNON G. and UYTTERHOEVEN K.

Abstract (from CDS):

We made a seismic study of the young massive β Cephei star HD 203664 with the goal of constraining its interior structure. Our study is based on a time series of 328 new Geneva 7-colour photometric data of the star spread over 496.8 days. The data confirm the frequency of the dominant mode of the star, which we refined to f1=6.02885c/d. The mode has a large amplitude of 37mmag in V and is unambiguously identified as a dipole mode (l=2) from its amplitude ratios and non-adiabatic computations. Besides f1, we discovered two additional new frequencies in the star with amplitudes above 4σ: f2=6.82902c/d and f3=4.81543c/d, or one of their daily aliases. The amplitudes of these two modes are only between 3 and 4mmag, which explains why they were not detected before. Their amplitude ratios are too uncertain for mode identification. We show that the observed oscillation spectrum of HD 203664 is compatible with standard stellar models but that we have insufficient information for asteroseismic inferences. Among the large-amplitude β Cephei stars, HD 203664 stands out as the only one rotating at a significant fraction of its critical rotation velocity (∼40%).

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: variables: general - stars: early-type - stars: individual: HD 203664 - stars: interiors

VizieR on-line data: <Available at CDS (J/A+A/449/305): table1.dat>

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* KP Per bC* 03 32 38.9775724956 +44 51 20.734842154 5.7 6.44 6.41     B2IV 119 0
2 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 366 0
3 V* IL Vel bC* 09 17 31.1517723026 -52 50 19.474514114 8.51 9.13 9.16     B2III 34 0
4 V* KZ Mus bC* 12 39 19.1643133160 -71 37 18.462449095 8.49 9.09 9.02     B2III 42 0
5 V* V836 Cen bC* 14 46 25.7600874450 -37 13 20.072260223 7.04 7.88 8.05     B2 100 0
6 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 90 0
7 V* BW Vul bC* 20 54 22.3949148537 +28 31 19.182736153 5.47 6.40 6.54     B2IIIv 284 0
8 V* SY Equ bC* 21 23 28.8088793903 +09 55 54.912227772 7.37 8.33 8.53     B0.5IIIn 83 0
9 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 343 0

    Equat.    Gal    SGal    Ecl

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2020.08.06-03:03:58

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