HD 37836
Star in Large Magellanic Cloud
From Wikipedia, the free encyclopedia
HD 37836 is a candidate luminous blue variable located in the Large Magellanic Cloud and one of the brightest stars in its galaxy.[5][7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado[2] |
| Right ascension | 05h 35m 16.633s[3] |
| Declination | −69° 40′ 38.44″[3] |
| Apparent magnitude (V) | 10.55[4] |
| Characteristics | |
| Spectral type | B0Iae[5] |
| Apparent magnitude (U) | 9.87 |
| Apparent magnitude (B) | 10.736 |
| Apparent magnitude (R) | 10.73 |
| Apparent magnitude (I) | 10.164 |
| Apparent magnitude (J) | 9.886 |
| Apparent magnitude (H) | 9.72 |
| Apparent magnitude (K) | 9.381 |
| Variable type | cLBV and α Cygni |
| Astrometry | |
| Radial velocity (Rv) | −474.41 km/s |
| Parallax (π) | 0.0271±0.0139 mas[3] |
| Distance | 163,000 ly (49,970 pc) |
| Absolute magnitude (MV) | −8.5[6] |
| Details | |
| Radius | 85[4] R☉ |
| Luminosity | 4,169,000[4] L☉ |
| Surface gravity (log g) | 2.14[3] cgs |
| Temperature | 28,200[4] K |
| Other designations | |
| HD 37836, RMC 123, R123, HIP 26222 | |
| Database references | |
| SIMBAD | data |
History
The star was first mentioned in a 1901 paper as an object with an unusual spectrum with bright H-alpha, H-beta and H-delta lines located in the LMC.[8] Later it was catalogued in the Henry Draper Catalogue and given the designation HD 37836. In 1957 it was noted that its spectral lines show a P Cygni profile.[9]
Stellar properties
HD 37836 is an extremely luminous blue supergiant with parameters similar to other similar stars, such as η Carinae A. It is also an α Cygni variable.[10] Its apparent magnitude varies by ~0.2 magnitudes.
In 1983, its luminosity was estimated to be 5.6 million L☉ and its mass was estimated to be 100 M☉, which would make it one of the most luminous and most massive known stars.[11]
A paper published in 1987 again noted the star's peculiar spectrum. It also concluded that the star might be similar to HD 269445 and Hen S 131. The star's luminosity was estimated to be around 4 million L☉.[12]
A year later, it was classified as a possible S Doradus variable.[13] A 1998 paper considers it an active LBV, an Alpha Cygni variable, and a 2018 census of LBVs considers it to be a candidate.[7][14]
A 2023 paper estimates its luminosity to be 4.2 million solar luminosities and its temperature to be 28,200 K based on the star's spectral type, corresponding to a radius of 85 solar radii, comparable to that of Rigel.[4]