1996A&A...306..771R

Query : 1996A&A...306..771R

1996A&A...306..771R - Astronomy and Astrophysics, volume 306771-782 (1996/2-3)

WR22: the most massive Wolf-Rayet star ever weighed.

RAUW G., VREUX J.-M., GOSSET E., HUTSEMEKERS D., MAGAIN P. and ROCHOWICZ K.

Abstract (from CDS):

The results of an extensive spectroscopic campaign on the eclipsing binary WR22 are presented. A new radial velocity curve is deduced for the WN7 component, allowing us to improve the parameters of the orbit, formerly determined on the basis of photographic spectra. The high signal-to-noise ratio of our data also allows the detection of some weak absorption lines which, for the first time, can definitely be attributed to the companion. A study of their radial velocities gives a mass ratio of mWR/mO=2.78 leading to a minimum mass of 72M☉ for the WN7 star. The companion can be classified as a "late O" (O6.5-O8.5) star with a luminosity ratio of the system q=LWRy/LOy at 5500A of about 8. The exceptionally high mass of the WN7 star and its high hydrogen mass-fraction suggest that WR22 is at the beginning of its Wolf-Rayet evolution. As a matter of fact, with such a high mass, WR22 most probably is still a hydrogen burning object. Therefore, the WN7 component is much closer to a main sequence O star with a "Wolf-Rayet clothing" than to the other members of the Wolf-Rayet family, which are rather highly evolved He-burning descendants of massive progenitors.

Abstract Copyright: ∼

Journal keyword(s): stars: individual: WR 22 - stars: Wolf-Rayet - binaries: spectroscopic - binaries: eclipsing - stars: fundamental parameters

Simbad objects: 1

goto View the references in ADS

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 92740 WR* 10 41 17.5158425712 -59 40 36.895992960 5.68 6.50 6.42 7.38   WN7h+O9III-V 426 0

Query : 1996A&A...306..771R

Basic data :
HD 92740 -- Wolf-Rayet
Other object types: otypes_help 		* (1971PW&SO,HD,...), X (CXOGNC,1E,...), V* (2012ApJ,CSV,...), WR* (MR,WR), SB* (SBC7,SBC9), Em* (Hen,WRAY), UV (CEL,TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		10 41 17.5158425712 -59 40 36.895992960 (Optical) [ 0.0207 0.0184 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		10 39 22.5439042665 -59 24 54.506389902 [ 0.0207 0.0184 90 ]
Gal coord. (ep=J2000) : 		287.1741975273765 -00.8475397372766 [ 0.0207 0.0184 90 ]
Proper motions mas/yr : 		-7.540 2.990 [0.027 0.025 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -28.00 [7.4] / z(~) -0.000093 [0.000025] / cz -28.00 [7.40]
   D 2007AN....328..889K
Parallaxes (mas): 		0.3898 [0.0223] A 2020yCat.1350....0G
Spectral type: 		WN7h+O9III-V C 2006A&A...457.1015H
Fluxes (9) :
U 5.68 [~] C 2002yCat.2237....0D
B 6.50 [~] C 2002yCat.2237....0D
V 6.42 [~] C 2002yCat.2237....0D
R 7.38 [0.31] E 2012yCat.1322....0Z
G 6.257005 [0.002968] C 2020yCat.1350....0G
J 5.705 [0.029] C 2003yCat.2246....0C
H 5.578 [0.038] C 2003yCat.2246....0C
K 5.389 [0.018] C 2003yCat.2246....0C
i 7.50 [0.01] E 2012yCat.1322....0Z
SIMBAD within arcmin
Overlay Simbad points in this preview
Back
All CDSPortal (CDSPortal)
Send to sendBySAMP sendBySAMP
sedIcon
within arcsec sed-help-icon

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 7028 Display criteria :

Identifiers (50) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 92740 GCRV 6657 NSV 4939 UCAC4 152-051964
AGASC 1130643264 GEN# +1.00092740 PPM 339335 uvby98 100092740
ALS 1761 GOS G287.17-00.85 01 SAO 238353 V* V429 Car
CD-59 3221 GSC2 S1113030700 SBC7 413 WEB 9523
CEL 3643 GSC 08626-02024 SBC9 629 WRAY 15-628
Cl Bochum 10 54 Hen 3-470 SKY# 20475 WR 22
CPC 20 3104 HIC 52308 SV* ZI 842 2XMM J104117.5-594038
CPD-59 2450 HIP 52308 TD1 15070 XMMU J104117.5-594038
CSV 101151 HR 4188 TIC 458559498 Gaia DR2 5350370026290390912
CXOGNC J104117.50-594037.0 LLNS 2297 TYC 8626-2024-1 Gaia DR3 5350370026290390912
1E 1039.4-5924 LS 1761 UBV 9823 Gaia DR1 5350370021964583040
1eRASS J104117.5-594036 2MASS J10411749-5940369 UBV M 16451
GC 14707 MR 25 UCAC3 61-116878

References (426 between 1850 and 2026) (Total 426)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements Description of Measurements

Velocities : 4    Distance : 3    Plx : 5    PM : 5    SpT : 9   

   

Observing logs
IUE : 15    XMM : 10   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

HD 92740 ALS 1761 CD-59 3221 CEL 3643 CPD-59 2450
GSC 08626-02024 HIC 52308 HIP 52308 HR 4188 LS 1761
2MASS J10411749-5940369 NSV 4939 PPM 339335 SAO 238353 TD1 15070
TYC 8626-2024-1 UCAC3 61-116878 UCAC4 152-051964 uvby98 100092740 V* V429 Car
Gaia DR2 5350370026290390912 Gaia DR3 5350370026290390912 Gaia DR1 5350370021964583040

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 1996A&A...306..771R and select 'bookmark this link' or equivalent in the popup menu