| Issue |
A&A
Volume 411, Number 3, December I 2003
|
|
|---|---|---|
| Page(s) | 565 - 579 | |
| Section | Stellar atmospheres | |
| DOI | https://doi.org/10.1051/0004-6361:20031342 | |
| Published online | 17 November 2003 | |
Rotation, pulsations and magnetic field in V 2052 Ophiuchi: A new He-strong star *,**
1
Sterrenkundig Instituut “Anton Pannekoek”, Universiteit van Amsterdam, The Netherlands
2
GEPI/UMR 8111 du CNRS, Observatoire de Paris-Meudon, France
3
Current affiliation: RSSD, Estec / ESA, Keplerlaan 1, 2201 AZ, Noordwijk ZH, The Netherlands
4
Max Planck Institut für Aeronomie, Lindau, Germany
5
Harvard/Smithsonian Center for Astrophysics, Cambridge, MA, USA
6
Observatoire de la Côte d'Azur, France
7
Astronomical Observatory Beograd, Yugoslavia
Corresponding author: C. Neiner, cneiner@rssd.esa.int
Received:
13
August
2002
Accepted:
19
August
2003
V 2052 Oph is a β Cep star with 
km s-1.
The behavior of its stellar wind was studied in the ultraviolet wavelength region
with the IUE satellite. It revealed periodic variations in the equivalent
widths (EW)
of the resonance lines of wind-sensitive ions with a period of 3.638833 d, which is
identified as the rotational period. These variations are typical of magnetic stars.
Therefore time-resolved circular spectropolarimetric observations were
obtained with the Musicos échelle spectropolarimeter at the 2-m Télescope Bernard
Lyot (TBL) to search for a magnetic field in the star. Stokes V patterns were
observed, the inclination and magnetic
angles were derived and a value was determined for the polar magnetic field
(
G)
using an oblique rotator dipole model.
The spectroscopic information was used to search for periodicity in line-profile
variations (lpv), radial velocity and minimum intensity curves. Multiperiodicity was
found, corresponding to radial (
c d-1) and non-radial
(
c d-1, 
or 4) pulsation modes. The rotation period is also
detected in rotationally modulated observables because of the magnetic poles
passing through the observer's line of sight.
We determined the stellar parameters of the star, which was found to be chemically
peculiar, in particular He-enriched. This makes V 2052 Oph the first
magnetic He-strong early B star with known pulsational properties.
Key words: stars: magnetic fields / stars: winds, outflows / stars: chemically peculiar / stars: early-type / stars: oscillations
Based on observations obtained with the MuSiCoS spectropolarimeter at the Observatoire du Pic du Midi, France, and by the International Ultraviolet Explorer, collected at NASA Goddard Space Flight Center and Villafranca Satellite Tracking Station of the European Space Agency, retrieved from the INES database.
© ESO, 2003
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