WR 30a

WR 30a
Location of WR 30a (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 51m 38.906s[1]
Declination −60° 56′ 34.91″[1]
Apparent magnitude (V) 12.73[2]
Characteristics
Evolutionary stage Wolf–Rayet star
Spectral type WO4 + O5((f))[3]
U−B color index −0.22[4]
B−V color index +1.04[4]
Variable type WR[2]
Astrometry
Proper motion (μ) RA: −5.642[1] mas/yr
Dec.: 2.842[1] mas/yr
Parallax (π)0.1201 ± 0.0099 mas[1]
Distance6,720+1,400
−1,090[5] pc
Absolute magnitude (MV)−5.39[6] (−2.80 + −5.38)
Orbit
PrimaryWR
CompanionO
Period (P)4.619 days[7]
Semi-major axis (a)35.4 R☉[8]
Eccentricity (e)0.2[8]
Inclination (i)20 ± 5[8]°
Semi-amplitude (K1)
(primary)		189[4] km/s
Semi-amplitude (K2)
(secondary)		25[8] km/s
Details
WR
Mass7.5-9.7[8] M☉
Radius0.88[a] R☉
Luminosity195,000[9] L☉
Temperature129,500[9] K
O
Mass40-60[8] M☉
Other designations
WR 29a, V574 Carinae, GSC 08958-04143, MS4
Database references
SIMBADdata

WR 30a is a massive spectroscopic binary in the Milky Way galaxy, in the constellation Carina. The primary is an extremely rare star on the WO oxygen sequence and the secondary a massive class O star. It appears near the Carina Nebula but is much further away.

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