2004A&A...421..715S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET08:42:19

2004A&A...421..715S - Astronomy and Astrophysics, volume 421, 715-727 (2004/7-2)

XMM-Newton observations of the σ Ori cluster. I. The complex RGS spectrum of the hot star σ Ori AB.

SANZ-FORCADA J., FRANCIOSINI E. and PALLAVICINI R.

Abstract (from CDS):

We present XMM-Newton observations of the young (∼2-5Myr) cluster around the hot (O9.5V) star σ Orionis AB, aimed at obtaining a high resolution RGS spectrum of the hot star as well as EPIC imaging data for the whole field. We show that the RGS spectrum of σ Ori AB may be contaminated by weaker nearby sources which required the development of a suitable procedure to extract a clean RGS spectrum and to determine the thermal structure and wind properties of the hot star. We also report on the detection of a flare from the B2Vp star σ Ori E and we discuss whether the flare originated from the hot star itself or rather from an unseen late-type companion. Other results of this observation include: the detection of 174 X-ray sources in the field of σ Ori of which 76 are identified as cluster members, including very low-mass stars down to the substellar limit; the discovery of rotational modulation in a late-type star near σ Ori AB; no detectable line broadenings and shifts (≲800km/s) in the spectrum of σ Ori AB together with a remarkable low value of the OVII forbidden to intercombination line ratio and unusually high coronal abundances of CNO elements.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: winds, outflows - stars: individual: σ Ori - stars: early-type - stars: late-type

Nomenclature: Table 1: [W96] rJ053841-0237 added.

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * lam Eri Be* 05 09 08.7831482 -08 45 14.690823 3.17 4.07 4.27 4.35 4.55 B2III(e)p 282 1
2 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 234 0
3 [W96] 4771-1147 Y*O 05 38 38.4905071912 -02 34 55.092418953 15.117 13.49 12.35 11.73 10.97 K2.0 15 0
4 UCAC2 30800097 LM* 05 38 41.2928629867 -02 37 22.625846957 16.93 15.86 14.54 13.67 12.78 M0.0 16 0
5 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 477 0
6 * sig Ori C Y*? 05 38 44.1192385581 -02 36 06.309707031   8.77 8.79   9.63 A2Vn 26 0
7 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 734 0
8 * sig Ori D Y*O 05 38 45.6255496741 -02 35 58.888435332 5.7 6.51 6.69   6.98 B2V 47 0
9 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 394 0
10 * zet Ori ** 05 40 45.52666 -01 56 33.2649   1.59 1.79     O9.7Ib+B0III 327 0
11 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1087 1
12 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1480 1
13 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 261 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-08:42:19

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