2002A&A...396..877K


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET12:29:25

2002A&A...396..877K - Astronomy and Astrophysics, volume 396, 877-884 (2002/12-4)

A 2.4-12µm spectrophotometric study with ISO of CygnusX-3 in quiescence.

KOCH-MIRAMOND L., ABRAHAM P., FUCHS Y., BONNET-BIDAUD J.-M. and CLARET A.

Abstract (from CDS):

We present mid-infrared spectrophotometric results obtained with the ISO on the peculiar X-ray binary Cygnus X-3 in quiescence, at orbital phases 0.83 to 1.04. The 2.4-12µm continuum radiation observed with ISOPHOT-S can be explained by thermal free-free emission in an expanding wind with, above 6.5µm, a possible additional black-body component with temperature T∼250K and radius R∼5000R at 10kpc, likely due to thermal emission by circumstellar dust. The observed brightness and continuum spectrum closely match that of the Wolf-Rayet star WR 147, a WN8+B0.5 binary system, when rescaled at the same 10 kpc distance as Cygnus X-3. A rough mass loss estimate assuming a WN wind gives ∼1.2x10–4M/yr. A line at ∼4.3µm with a more than 4.3σ detection level, and with a dereddened flux of 126mJy, is interpreted as the expected He I 3p-3s line at 4.295µm, a prominent line in the WR147 spectrum. These results are consistent with a Wolf-Rayet-like companion to the compact object in Cyg X-3 of WN8 type, a later type than suggested by earlier works.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: individual: Cyg X-3 - stars: Wolf-Rayet - stars: mass-loss - infrared: stars

Simbad objects: 5

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Number of rows : 5

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 151932 WR* 16 52 19.2478420644 -41 51 16.269632432 6.06 6.79 6.51 7.64   WN7h 296 0
2 HD 191765 WR* 20 10 14.1929815789 +36 10 35.069005168 7.64 8.08 8.08     WN6-s 425 0
3 HD 192163 WR* 20 12 06.5420067895 +38 21 17.783840972 7.12 7.49 7.50     WN6(h)-s 522 0
4 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1788 2
5 EM* AS 431 WR* 20 36 43.6345223872 +40 21 07.453291511       12.51   WN8(h)+B0.5V 211 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-12:29:25

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