1999A&A...347..583G

Query : 1999A&A...347..583G

1999A&A...347..583G - Astronomy and Astrophysics, volume 347583-589 (1999/7-2)

Long-term coherent variations in the WR system EZ Canis Majoris: the binary scenario revisited.

GEORGIEV L.N., KOENIGSBERGER G., IVANOV M.M., ST-LOUIS N. and CARDONA O.

Abstract (from CDS):

An analysis of seven different spectroscopic and eight photometric sets of observations of the WN5 star HD 50896=EZ CMa, distributed over more than 15 years is used to refine the known 3.76 days period. The value of P=3.7650±0.0001d yields variations which have coherent phase-dependence. Although not conclusive, this coherence in the 3.7650 day periodic variations over such a long time revives scenarios in which HD 50896 consists of a binary system, a hypothesis that had been nearly completely discarded over the past few years. A binary scenario is not in contradiction with the presence of a non-spherically symmetric wind distribution or instabilities in the WR star's wind and, in fact, mechanisms such as these are probably responsible for the difficulty in having until now obtained a period which yields coherent variations. The low X-ray fluxes suggest that the possible companion may not be a collapsed object, or that the accretion process is inhibited.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: spectroscopic - stars: Wolf-Rayet - stars: variables: general - stars: individual: HD 50896 = EZ CMa = WR6

VizieR on-line data: <Available at CDS (J/A+A/347/583): table3a.dat table3b.dat table3c.dat>

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 50896 WR* 06 54 13.0439608392 -23 55 42.023319852 5.74 6.63 6.91 7.74   WN4b 794 0

Query : 1999A&A...347..583G

Basic data :
HD 50896 -- Wolf-Rayet
Other object types: otypes_help 		* (1971PW&SO,HD,...), X (2E,1RXS,...), WR* (2003AstL,MR,...), V* (2012ApJ,CSV,...), HII (LBN,RCW,...), Em* (Hen,WRAY), UV (CEL,TD1), SB* (2022A&A), ISM (BRAN), EmO (LMA), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		06 54 13.0439608392 -23 55 42.023319852 (Optical) [ 0.0170 0.0273 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		06 52 08.1365593570 -23 51 51.750211015 [ 0.0170 0.0273 90 ]
Gal coord. (ep=J2000) : 		234.7567724008183 -10.0832262647064 [ 0.0170 0.0273 90 ]
Proper motions mas/yr : 		-4.322 3.098 [0.024 0.033 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 164.00 [~] / z(~) 0.000547 [~] / cz 164.04 [~]
   D 1994A&AS..108..603B
Parallaxes (mas): 		0.6505 [0.0366] A 2020yCat.1350....0G
Spectral type: 		WN4b C 1996MNRAS.281..163S
Fluxes (8) :
U 5.74 [~] C 2002yCat.2237....0D
B 6.63 [~] C 2002yCat.2237....0D
V 6.91 [~] C 2002yCat.2237....0D
R 7.74 [0.12] E 2012yCat.1322....0Z
G 6.583162 [0.003003] C 2020yCat.1350....0G
J 6.353 [0.029] C 2003yCat.2246....0C
H 6.226 [0.038] C 2003yCat.2246....0C
K 5.893 [0.020] C 2003yCat.2246....0C
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Identifiers (53) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 50896 GEN# +5.11210004 N30 1504 uvby98 511210004
ALS 98 GSC 06522-03270 PPM 251223 V* EZ CMa
BRAN 2 Hen 3-20 RCW 11 WRAY 15-2
CD-23 4553 HIC 33165 1RXS J065413.8-235543 WR 6
CEL 1426 HIP 33165 SAO 172546 2XMM J065413.0-235542
Cl Collinder 121 4 HR 2583 SH 2-308 YZ 113 4156
CMC 203719 IRAS 06521-2351 SKY# 12250 [BNJ2003] XMM 1
CMC 172546 JP11 4532 TD1 8528 [TSA98] J065412.01-235541.40
CPD-23 1588 LBN 234.57-10.00 TIC 78959225 Gaia DR2 2922367976673391232
CSV 6527 LBN 1052 TYC 6522-3270-1 Gaia DR3 2922367976673391232
2E 1743 LMA IC 1613 10 UBV M 12581 Gaia DR1 2922367972368451072
2E 0652.1-2351 LS 98 UBV M 40625
GC 9061 2MASS J06541303-2355422 UBV 6842
GCRV 4522 MR 6 UCAC4 331-017802

References (794 between 1850 and 2026) (Total 794)
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 : 1    Distance : 2    Var : 1    Plx : 5    PM : 6    SpT : 10   

   

Observing logs
Herschel : 5    ISO : 1    IUE : 351    XMM : 5   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : HD 50896

Link by name to the catalogue in VizieR :

HD 50896 ALS 98 CD-23 4553 CEL 1426 CPD-23 1588
2E 1743 GSC 06522-03270 HIC 33165 HIP 33165 HR 2583
IRAS 06521-2351 LS 98 2MASS J06541303-2355422 PPM 251223 1RXS J065413.8-235543
SAO 172546 TD1 8528 TYC 6522-3270-1 UCAC4 331-017802 uvby98 511210004
V* EZ CMa Gaia DR2 2922367976673391232 Gaia DR3 2922367976673391232 Gaia DR1 2922367972368451072

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