Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.401.2739l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 4, pp. 2739-2752.
Astronomy and Astrophysics
Astronomy
5
Binaries: Spectroscopic, Stars: Chemically Peculiar, Circumstellar Matter, Stars: Individual: Hd36485, Stars: Magnetic Fields
Scientific paper
Extensive Hα spectroscopy of the cool, helium-strong star δOriC obtained over two decades has enabled a detailed analysis of the variable Hα emission observed in this sharp-lined and strongly magnetic B3V star. Radial velocity measurements from these and other spectra have also confirmed the binary nature of the star, the first detection of the secondary being provided, and permitted an improved determination of the system's orbital parameters. The amplitude of the radial velocities and a preliminary spectroscopic analysis indicate that the secondary component is an early A-type star. Disentangling the contribution of the two components to the Balmer line profiles, we determine an effective temperature for δOriC slightly larger than previously adopted in the literature. The Hα emission is variable with a period of 1.47775 +/- 0.00004d, assumed to be the rotation period of the primary component. After removal of the binary system's photospheric contribution to the Hα line, we find that the emission arises from two distinct, but asymmetrical, optically translucent circumstellar clouds. When strongest the emission peaks have intensities of approximately 15 per cent of the continuum level at about 150kms-1 on either side of the line centre, and emission is apparent to +/-225kms-1, or 6R* above the photosphere if we assume that the magnetic field forces the circumstellar material into rigid rotation about the star. New 6cm Very Large Array radio measurements, when combined with archival data, suggest that the radio flux of the star is also variable. An analysis of new and previously published magnetic field observations enabled us to derive a value for the inclination of the rotation axis of i = 12° +/- 3° and an obliquity of the magnetic axis of β <= 52°. The nature of the emission variability is similar to that of the prototypical helium-strong star σ Ori E, but since the latter object has an inclination of >75°, δOriC provides us with an opportunity to investigate the cool components of the winds and magnetospheres of the helium-strong stars from a different vantage point.
Based on observations obtained at the European Southern Observatory, Complejo Astrónomico El Leoncito, Osservatorio Astrofisico di Catania and Italian Telescopio Nazionale Galileo, the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, the University of Hawaii, the Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada and the David Dunlap Observatory, University of Toronto.
E-mail: fleone@oact.inaf.it
Bohlender David A.
Bolton Charles T.
Buemi Carla
Catanzaro Giovanni
Hill Grant Michael
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