2013A&A...560A..27P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST11:32:52

2013A&A...560A..27P - Astronomy and Astrophysics, volume 560A, 27-27 (2013/12-1)

WR 138: new results from X-ray and optical spectroscopy.

PALATE M., RAUW G., DE BECKER M., NAZE Y. and EENENS P.

Abstract (from CDS):

Massive-binary evolution models predict that some systems will go through an evolutionary phase where the original primary has become a supernova and left a compact object behind that then orbits a Wolf-Rayet (WR) star. WR138 is an X-ray bright WR star that has been described as a triple system, including a compact companion in a short-period orbit. Our goal is to search for spectroscopic evidence of a compact companion around WR138. We used optical and X-ray spectra to search for signatures of a compact companion, which can be revealed by systematic variations in WR optical spectral lines induced by orbital motion of the compact companion or by hard, luminous X-rays from accretion onto this companion. The optical spectra display emission-line profile variations that are most probably caused by clumps inside the stellar winds. The radial velocities do not vary on a short time-scale compatible with the suggested orbital period of a putative compact companion. The X-ray spectra are found to be normal for a WN5-6+OB system with no indication of accretion by a compact companion. There is no evidence for the presence of a compact companion, and we therefore conclude that WR138 is a normal long-period (P∼1521d) eccentric WR+OB system.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: Wolf-Rayet - stars: massive - stars: individual: WR 138 (HD 193077) - X-rays: stars

Simbad objects: 6

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Number of rows : 6

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 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 381 0
2 HD 93162 WR* 10 44 10.3888220947 -59 43 11.105959983 7.90 8.55 8.80 8.66   O2.5If*/WN6+OB 334 1
3 HD 96548 WR* 11 06 17.2033098417 -65 30 35.237611013 7.10 7.80 7.70 8.49   WN8h 388 0
4 HD 193077 WR* 20 17 00.0264117871 +37 25 23.780238760 7.82 8.32 8.01 8.71   WN5-w+B? 277 0
5 HD 228766 WR* 20 17 29.7043498327 +37 18 31.125286410 9.42 9.79 9.14     O4If+O8:II: 111 0
6 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1765 2

    Equat.    Gal    SGal    Ecl

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2020.07.11-11:32:52

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