Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437..599r&link_type=abstract
Astronomy and Astrophysics, Volume 437, Issue 2, July II 2005, pp.599-609
Astronomy and Astrophysics
Astrophysics
6
Stars: Early-Type, Stars: Winds, Outflows, Stars: Variables: Β Cephei
Scientific paper
We present XMM-Newton observations of the B giant β Centauri (B1 III). The spectra are rich of spectral lines from a wide range of ionization stages which indicate temperatures in the range ~0.1-0.6 keV. Simultaneous fits to the rgs, epic-mos, and epic-pn spectra yield three plasma temperatures (0.1, 0.2, and 0.6 keV), emission measures, and elemental abundances which are quite close to solar values. These temperatures are confirmed by DEM modeling. According to the derived models the intrinsic source X-ray luminosity in the energy range 0.3-10 keV is Lx = 10 × 1030 erg s-1 at a distance of 161 pc. An analysis of the X-ray light curve suggests that the photospheric variability does not have much of an effect on the properties of the X-ray luminosity. The sensitivity of the He-like forbidden and intercombination lines to a strong ultraviolet stellar radiation field is used to constrain the radial distances at which the lines of Ne ix, O vii, and N vi originate.
Cassinelli Joe P.
Mewe Rolf
Miller Nancy A.
Raassen A. J. J.
Tepedelenlioglu Emre
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