2011MNRAS.411..635D

Query : 2011MNRAS.411..635D

2011MNRAS.411..635D - Mon. Not. R. Astron. Soc., 411, 635-643 (2011/February-2)

Spectroscopic study of the short-period WN5o + O8.5V binary system WR127 (HD 186943).

DE LA CHEVROTIERE A., MOFFAT A.F.J. and CHENE A.-N.

Abstract (from CDS):

Combined with previous information (orbital period P= 9.5550 d and inclination {img}), new optical spectroscopic data lead to improved circular orbits for this WR + O system, with mass 13.4 M☉ of the WN5o star and 23.9 M☉ of its O8.5V companion. These are normal for their spectral types. The WR/O mass ratio, q ≃ 0.56, is reasonable for such a binary. The relatively large orbital separation between the two components ( ∼ 63 R☉) implies that there is currently no interaction between the two stars beyond their colliding winds. Analysis of the excess line emission and absorption arising in the wind-wind collision zone yields the following parameters: streaming velocity vstrm= 1104 km/s, cone opening half-angle θ ≃ 59° and Coriolis angle shift {img}. Using probable values of mass-loss rate and terminal wind velocity for each star, a value of θ ≃ 37° is obtained. The difference in θ is likely due to a combination of uncertainty in these parameters and radiative braking. Altogether, WR127 is a normal, detached and non-photospherically eclipsing binary system, although it does show atmospheric `eclipses'.

Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS

Journal keyword(s): techniques: spectroscopic - binaries: spectroscopic - stars: individual: WR127 - stars: mass-loss - stars: winds, outflows - stars: Wolf-Rayet

Simbad objects: 1

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Number of rows : 1
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 186943 WR* 19 46 15.9393580368 +28 16 19.077099276 9.86 10.50 10.23     WN3+O9.5V 192 0

Query : 2011MNRAS.411..635D

Basic data :
HD 186943 -- Wolf-Rayet
Other object types: otypes_help 		* (HD,ALS,...), SB* (2022A&A,SBC7,...), WR* (MR,WR), Em* (Hen,[KW97]), EB* (2012A&A), Pu* (2022yCat), V* (V*), NIR (2MASS), Opt (LAMOST)
ICRS coord. (ep=J2000) : 		19 46 15.9393580368 +28 16 19.077099276 (Optical) [ 0.0081 0.0107 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		19 44 14.2968220608 +28 08 55.131049021 [ 0.0081 0.0107 90 ]
Gal coord. (ep=J2000) : 		064.0594626746335 +01.7334191575144 [ 0.0081 0.0107 90 ]
Proper motions mas/yr : 		-3.295 -5.908 [0.011 0.013 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 146.00 [10] / z(~) 0.000487 [0.000033] / cz 146.04 [10.00]
   D 2007AN....328..889K
Parallaxes (mas): 		0.2139 [0.0133] A 2020yCat.1350....0G
Spectral type: 		WN3+O9.5V C 2006A&A...457.1015H
Fluxes (7) :
U 9.86 [~] C 2002yCat.2237....0D
B 10.50 [~] C 2002yCat.2237....0D
V 10.23 [~] C 2002yCat.2237....0D
G 10.023361 [0.003387] C 2020yCat.1350....0G
J 9.182 [0.024] C 2003yCat.2246....0C
H 9.015 [0.030] C 2003yCat.2246....0C
K 8.761 [0.018] C 2003yCat.2246....0C
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Identifiers (29) :
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HD 186943 HIC 97281 SBC7 765 WR 127
ALS 10501 Hilt 828 SBC9 1173 [KW97] 39-36
CSI+28-19442 HIP 97281 TIC 452026724 Gaia DR3 2028294667765054464
GCRV 12144 JP11 3133 TYC 2151-4277-1 Gaia DR1 2028294663406184576
GCRV 69851 LAMOST J194615.78+281620.7 UBV 16833 Gaia DR2 2028294667765054464
GEN# +1.00186943 LS II +28 7 UBV M 24142
GSC 02151-04277 2MASS J19461593+2816191 V* QY Vul
Hen 3-1772 MR 94 WEB 17089

References (192 between 1850 and 2026) (Total 192)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 3    Distance : 2    Var : 2    Plx : 3    PM : 4    SpT : 11   

   

Observing logs
IUE : 20   

   

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HD 186943 ALS 10501 GSC 02151-04277 HIC 97281 HIP 97281
LS II +28 7 2MASS J19461593+2816191 TYC 2151-4277-1 V* QY Vul Gaia DR3 2028294667765054464
Gaia DR1 2028294663406184576 Gaia DR2 2028294667765054464

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