2003A&A...399..287R


Query : 2003A&A...399..287R

2003A&A...399..287R - Astronomy and Astrophysics, volume 399, 287-296 (2003/2-3)

Line profile variability in the spectra of Oef stars. I. BD+60deg2522.

RAUW G., DE BECKER M. and VREUX J.-M.

Abstract (from CDS):

We report the analysis of a long term observing campaign designed to monitor the spectroscopic variability of the Oef star BD+60°2522. We find that the double-peaked He II λ4686 emission line undergoes strong profile variability on time scales of 2-3day. However, the time scale as well as the pattern of these variations turn out to be epoch dependent and the phenomenon is thus most likely not ruled by a single stable clock. On the other hand, the absorption lines in the spectrum of BD+60°2522 display line profile variability on time scales of a few hours that might be related to non-radial pulsations. We tentatively propose that the beating of several non-radial pulsation modes triggers transient large-scale density perturbations in a confined stellar wind that produce the 2-3day time scale variability.

Abstract Copyright:

Journal keyword(s): line: profiles - stars: early-type - stars: mass-loss - stars: individual: BD+60°2522 - stars: variables: general

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 14434 Em* 02 21 52.4121560832 +56 54 18.032028876 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 187 0
2 HD 14442 V* 02 22 10.7004415512 +59 32 58.893287604 9.01 9.58 9.27     O5n(f)p 106 0
3 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1150 1
4 V* V2011 Cyg SB* 20 12 33.1203741480 +40 16 05.445674868 7.32 7.85 7.55     O4.5V(n)((f)) 207 0
5 * lam Cep s*b 22 11 30.5765111040 +59 24 52.154264880 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 683 1
6 BD+60 2522 Em* 23 20 44.5134945744 +61 11 40.530567984 8.46 9.08 8.67     O6.5(n)fp 212 1
7 NGC 7635 HII 23 20 48.3 +61 12 06           ~ 171 2

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