Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Dorado |
Right ascension | 5h 35m 16.633s [1] |
Declination | −69° 40′ 38.44″ [1] |
Apparent magnitude (V) | 10.55 [2] |
Characteristics | |
Spectral type | B0Iae [3] |
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 [1] |
Distance | 163,000
ly (49,970 pc) |
Absolute magnitude (MV) | −8.5 [4] |
Details | |
Radius | 85 [2] R☉ |
Luminosity | 4,169,000 [2] L☉ |
Surface gravity (log g) | 2.14 [1] cgs |
Temperature | 28,200 [2] K |
Other designations | |
HD 37836, RMC 123, R123, HIP 26222 | |
Database references | |
SIMBAD | data |
HD 37836 is a candidate luminous blue variable located in the Large Magellanic Cloud and one of the brightest stars in its galaxy. [3] [5]
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. [6] 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. [7]
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. [8] 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. [9]
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☉. [10]
A year later, it was classified as a possible S Doradus variable. [11] A 1998 paper considers it an active LBV, an Alpha Cygni variable, and a 2018 census of LBVs considers it to be a candidate. [5] [12]
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. [2]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Dorado |
Right ascension | 5h 35m 16.633s [1] |
Declination | −69° 40′ 38.44″ [1] |
Apparent magnitude (V) | 10.55 [2] |
Characteristics | |
Spectral type | B0Iae [3] |
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 [1] |
Distance | 163,000
ly (49,970 pc) |
Absolute magnitude (MV) | −8.5 [4] |
Details | |
Radius | 85 [2] R☉ |
Luminosity | 4,169,000 [2] L☉ |
Surface gravity (log g) | 2.14 [1] cgs |
Temperature | 28,200 [2] K |
Other designations | |
HD 37836, RMC 123, R123, HIP 26222 | |
Database references | |
SIMBAD | data |
HD 37836 is a candidate luminous blue variable located in the Large Magellanic Cloud and one of the brightest stars in its galaxy. [3] [5]
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. [6] 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. [7]
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. [8] 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. [9]
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☉. [10]
A year later, it was classified as a possible S Doradus variable. [11] A 1998 paper considers it an active LBV, an Alpha Cygni variable, and a 2018 census of LBVs considers it to be a candidate. [5] [12]
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. [2]