EZ CMa
HIP 33165
Star
CMa
Visible
Level 3
Medium telescope (6-8")
Physical Properties
Magnitude
6.91
Range
6.71 - 6.95
Period
3.8 days
Variable Type
Wolf-Rayet Variable
Spectral Type
WN5-B
Star Color
Blue
(B-V -0.28)
Position & Identifiers
RA
06h 54m 13.0s
Dec
-23° 55' 42.0"
Constellation
CMa
HR
2583
HIP
33165
Variable ID
EZ CMa
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Stellar Notes
E? 6.71 - 6.95V, 3.763d, possibly irregular. HeII 4686 var. about 13d; profiles var. in minutes. Suspected SN remnant. | Companion is probably a neutron star.
3.763d, K 36.1k/s, V0 +46.9k/s.
In HII region; member OB group near Omicron CMa; in cluster Collinder 121 (#4). The central star of a ring nebula.
One of only four WR stars bright enough to have been observed spectroscopically in UV by COPERNICUS. Reminiscent of | spectra of nova-like variables during an outburst, which is typical of close binaries. Circumstellar matter. Helium | rich. HII ring. Shell surrounding the star is estimated to be three solar masses. The B in the spectral type denotes | broad lines here, not a B-type spectrum.
Var. by 300k/s in less than 1d. Suspected binary. Interstellar lines RV +36k/s.
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