2010ApJ...715.1327S

Query : 2010ApJ...715.1327S

2010ApJ...715.1327S - Astrophys. J., 715, 1327-1337 (2010/June-1)

Chandra detects the rare oxygen-type Wolf-Rayet star WR 142 and OB stars in Berkeley 87.

SOKAL K.R., SKINNER S.L., ZHEKOV S.A., GUDEL M. and SCHMUTZ W.

Abstract (from CDS):

We present first results of a Chandra X-ray observation of the rare oxygen-type Wolf-Rayet (WR) star WR 142 (= Sand 5 = St 3) harbored in the young, heavily obscured cluster Berkeley 87. Oxygen-type WO stars are thought to be the most evolved of the WRs and progenitors of supernovae or gamma-ray bursts. As part of an X-ray survey of supposedly single WR stars, we observed WR 142 and the surrounding Berkeley 87 region with Chandra ACIS-I. We detect WR 142 as a faint yet extremely hard X-ray source. Due to weak emission, its nature as a thermal or non-thermal emitter is unclear and thus we discuss several emission mechanisms. Additionally, we report seven detections and eight non-detections by Chandra of massive OB stars in Berkeley 87, two of which are bright yet soft X-ray sources whose spectra provide a dramatic contrast to the hard emission from WR 142.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: Berkeley 87 - stars: individual (WR 16, WR 142 = Sand 5 = St 3, BD+36 4032, HD 229059, V439 Cyg) - stars: Wolf-Rayet - X-rays: stars

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 6327 WR* 01 05 23.0309242057 +60 25 18.900677036   11.49 11.33     WN2-w 122 0
2 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
3 HD 50896 WR* 06 54 13.0439608392 -23 55 42.023319852 5.74 6.63 6.91 7.74   WN4b 794 0
4 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 951 0
5 HD 86161 WR* 09 54 52.9033957968 -57 43 38.274644604 7.94 8.65 8.36 8.93   WN8h 230 0
6 HD 89358 WR* 10 17 02.2743231360 -57 54 46.875258324 11.1 11.19 10.83 10.59   WN4-s 181 1
7 PN Th 2-A PN 13 22 33.9621965258 -63 21 02.014697519           [WO3]pec 99 1
8 HD 152408 WR* 16 54 58.5051071856 -41 09 03.093075612 5.17 5.92 5.77 7.00   O8Iape 388 0
9 HD 165688 WR* 18 07 56.9609461704 -19 23 56.863324824 10.46 10.31 9.87 9.85   WN5-6b 162 0
10 HD 191765 WR* 20 10 14.1928045152 +36 10 35.070683376 7.64 8.08 8.08     WN6-s 452 0
11 HD 229059 s*b 20 21 15.3643937664 +37 24 31.106402136 10.66 10.23 8.70     B2Iabe 102 0
12 LS II +37 73 * 20 21 19.2550073064 +37 23 24.728636868 12.4 12.18 10.92     B0.2III 26 0
13 Cl Berkeley 87 13 * 20 21 31.5600459840 +37 20 41.414090928 12.53 12.41 11.32     B0.5III: 15 0
14 EM* MWC 1015 Be* 20 21 33.5822468448 +37 24 51.700205016 13.75 13.28 11.84     B1.5Ve 61 1
15 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0
16 Cl Berkeley 87 24 LP? 20 21 38.0978213760 +37 25 17.211356832 13.19 12.82 11.48     B1Ib 11 0
17 V* BC Cyg s*r 20 21 38.5478957040 +37 31 58.925226936   14.61 11.30     M3.5Ia 171 0
18 BD+36 4032 Em* 20 21 38.6831894784 +37 25 15.208439844 11.94 11.64 10.30 10.09   O8.5III 29 0
19 Cl Berkeley 87 26 * 20 21 39.6899416032 +37 25 05.582975052 13.63 13.25 11.83     B0.5I 14 0
20 WR 142 WR* 20 21 44.3438785440 +37 22 30.544989960   14.39 12.99 12.73 11.04 WO2 134 0
21 Cl Berkeley 87 32 * 20 21 47.3420980392 +37 26 31.999589664 13.22 12.91 11.57     B0.5III 14 0
22 EM* AS 431 WR* 20 36 43.6322747712 +40 21 07.442607924     13.73 12.51   WN8(h)+B0.5V 228 0

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