2008A&A...478..513R


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET20:25:20

2008A&A...478..513R - Astronomy and Astrophysics, volume 478, 513-520 (2008/2-1)

XMM-Newton observations of ζ Orionis (O9.7 Ib): a collisional ionization equilibrium model.

RAASSEN A.J.J., VAN DER HUCHT K.A., MILLER N.A. and CASSINELLI J.P.

Abstract (from CDS):

We present XMM-Newton observations of the O supergiant ζ Orionis (O9.7 Ib). The spectra are rich in emission lines over a wide range of ionization stages. The rgs spectra show for the first time lines of low ion stages such as CVI, NVI, NVII, and OVII. The line profiles are symmetric and rather broad (FWHM≃1500km/s) and show only a slight blue shift. With the XMM-epic spectrometer several high ions are detected in this star for the first time including ArXVII and Sxv. Simultaneous multi-temperature fits and DEM-modeling were applied to the rgs and epic spectra to obtain emission measures, elemental abundances and plasma temperatures. The calculations show temperatures in the range ≃0.07-0.6keV. According to the derived models the intrinsic source X-ray luminosity at a distance of 251pc is Lx=1.37(.03)x1032erg/s in the energy range 0.3-10keV. In the best multi-temperature model fit, the abundances of C, N, O, and Fe are near their solar values, while the abundances of Ne, Mg, and Si appear somewhat enhanced. The sensitivity of the He-like forbidden and intercombination lines to ζ Ori's strong radiation field is used to derive the radial distances at which lines are formed. Values of 34R* for NVI, 12.5R* for OVII, 4.8R* for NeIX, and 3.9R* for MgXI are obtained.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: winds, outflows - X-rays: individual: ζ Orionis - X-rays: stars

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 74 * 00 05 39.5754746928 -07 54 12.929373991   10.49 9.59     K2V 8 0
2 * del02 Ori SB* 05 32 00.4062922775 -00 17 04.345829128 5.97 6.67 6.83     B2Vsn 268 0
3 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 240 0
4 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 866 0
5 * zet Ori ** 05 40 45.52666 -01 56 33.2649 0.50 1.56 1.77 1.85 2.05 O9.7Ib+B0III 334 0
6 * zet Ori A ** 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 647 0
7 * zet Ori B * 05 40 45.571207 -01 56 35.58704   3.55 3.73     O9.5II-III(n) 167 0
8 * zet Ori C * 05 40 46.1666849078 -01 55 36.342369603   9.64 9.54     ~ 9 0

    Equat.    Gal    SGal    Ecl

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