2004A&A...427..995D


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET02:00:35

2004A&A...427..995D - Astronomy and Astrophysics, volume 427, 995-1008 (2004/12-1)

Line profile variability in the spectra of Oef stars. II. HD 192281, HD 14442 and HD 14434.

DE BECKER M. and RAUW G.

Abstract (from CDS):

We present the very first analysis of the spectroscopic variability of the three rapidly rotating Oef stars HD 192281 (O5(ef)), HD 14442 (O5.5ef) and HD 14434 (O6.5(ef)). Radial velocities of the HeII λ 4541 line reveal no evidence of binarity on time scales of a few days, or from one year to the next, for any of the targets. The HeII λ 4686 double-peaked emission and, to some extent, the Hβ absorption line display significant profile variability in the spectra of all three stars. Data gathered during different observing runs spread over six years reveal a rather stable time scale for HD 192281 and HD 14442, whereas the variability pattern changes significantly from one year to the other. The case of HD 14434 is less clear as no obvious time scale emerges from our analysis. In a tentative way to interpret this variability, stellar rotation remains a possible clock for HD 192281 and HD 14442. However, currently available models addressing stellar rotation fail to explain some crucial aspects of the observed variability behaviour, which appear to be even more complex in the case of HD 14434.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: individual: HD 192281 - stars: individual: HD 14442 - stars: individual: HD 14434 - stars: variables: general - stars: winds, outflows

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 14434 Em* 02 21 52.4122106464 +56 54 18.032877629 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 172 0
2 HD 14442 V* 02 22 10.7000311184 +59 32 58.894123083 9.01 9.58 9.27     O5n(f)p 99 0
3 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1294 1
4 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1107 1
5 V* V2011 Cyg SB* 20 12 33.1205906584 +40 16 05.442931142 7.32 7.85 7.55     O4.5V(n)((f)) 198 0
6 HD 192639 s*b 20 14 30.4275040181 +37 21 13.815126140 6.83 7.46 7.11     O7.5Iabf 272 0
7 * lam Cep s*b 22 11 30.5750839949 +59 24 52.147736074 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 652 1
8 BD+60 2522 Em* 23 20 44.5136097871 +61 11 40.528599394 8.46 9.08 8.67     O6.5(n)fp 202 1

    Equat.    Gal    SGal    Ecl

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2021.03.08-02:00:35

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