V518 Carinae (HR 4196) is a naked-eye variable star in the constellation Carina. It is a member of the bright open cluster IC 2602 near the Carina Nebula.
Location of V518 Carinae in IC 2602 (circled) | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Carina |
Right ascension | 10h 42m 14.12040s[1] |
Declination | −64° 27′ 59.1323″[1] |
Apparent magnitude (V) | 4.82[2] |
Characteristics | |
Spectral type | B3/5V[3] |
U−B color index | −0.58[2] |
B−V color index | −0.14[2] |
Variable type | γ Cas?[4] |
Astrometry | |
Parallax (π) | 7.19 ± 0.20 mas[1] |
Distance | 450 ± 10 ly (139 ± 4 pc) |
Absolute magnitude (MV) | −1.169[5] |
Details | |
Mass | 6.2[6] M☉ |
Radius | 3.30±0.07[7] R☉ |
Luminosity | 753[5] L☉ |
Surface gravity (log g) | 4.015[8] cgs |
Temperature | 15,397[5] K |
Rotational velocity (v sin i) | 120[8] km/s |
Age | 17.2[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
V518 Carinae lies in the open cluster IC 2602, 5 arc minutes from its brightest member θ Carinae.
518 Carinae was discovered to change in brightness after analysis of Hipparcos photometry. The amplitude of the variations seen is 0.2 magnitudes, with possible periods of 100 and 971 days.[11] It is classified as a γ Cassiopeiae variable.[12][4]
V518 Carinae is classified as a B-type main sequence star between B3 and B5.[13] It is also catalogued as a helium star, a chemically peculiar star with abnormally strong helium absorption lines in its spectrum and relatively weak hydrogen lines. It is possibly a blue straggler.[14]
V518 Carinae is also a Be star, a hot star with emission lines in its spectrum due to a disk of material around the star. Be stars that show irregular brightness changes due to the disk are grouped as γ Cassiopeiae variables. V518 Carinae is known to produce disk outbursts lasting several hundred days.[15]