Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...411..565n&link_type=abstract
Astronomy and Astrophysics, v.411, p.565-579 (2003)
Astronomy and Astrophysics
Astrophysics
54
Stars: Magnetic Fields, Stars: Winds, Outflows, Stars: Chemically Peculiar, Stars: Early-Type, Stars: Oscillations
Scientific paper
V 2052 Oph is a beta Cep star with v sin i ~ 60 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 (250 +/- 190 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 (f_1=7.15 c d-1) and non-radial (f_2=6.82 c d-1, l=3 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.
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.}\fnmsep\thanks{Table \ref{tabmagV} is only available in electronic form at
http://www.edpsciences.org
Floquet Michele
Frémat Yves
Geers Vincent Carlo
Henrichs Hubertus F.
Hubert Anne-Marie
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