HD 37836
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 5h 35m 16.633s[2] |
| Declination | −69° 40′ 38.44″[2] |
| Apparent magnitude (V) | 10.55[3] |
| Characteristics | |
| Spectral type | B0Iae[4] |
| 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[2] |
| Distance | 163,000 ly (49,970 pc) |
| Absolute magnitude (MV) | −8.5[5] |
| Details | |
| Radius | 85[3] R☉ |
| Luminosity | 4,169,000[3] L☉ |
| Surface gravity (log g) | 2.14[2] cgs |
| Temperature | 28,200[3] 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.[4][6]
History
[edit]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.[7] 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.[8]
Stellar properties
[edit]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.[9] 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.[10]
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☉.[11]
A year later, it was classified as a possible S Doradus variable.[12] A 1998 paper considers it an active LBV, an Alpha Cygni variable, and a 2018 census of LBVs considers it to be a candidate.[6][13]
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.[3]
References
[edit]- ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875.
- ^ a b c d e Martin, John C.; Humphreys, Roberta M. (2023-10-30). "A Census of the Most Luminous Stars. I. The Upper HR Diagram for the Large Magellanic Cloud". The Astronomical Journal. 166 (5): 214. Bibcode:2023AJ....166..214M. doi:10.3847/1538-3881/ad011e. ISSN 0004-6256.
- ^ a b Lennon, Daniel J.; Marel, Roeland P. van der; Lerate, Mercedes Ramos; O’Mullane, William; Sahlmann, Johannes (2017-07-01). "Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars - Candidate hypervelocity star discovery and the nature of R 71". Astronomy & Astrophysics. 603: A75. arXiv:1611.05504. Bibcode:2017A&A...603A..75L. doi:10.1051/0004-6361/201630076. ISSN 0004-6361. S2CID 119474184.
- ^ Genderen, A. M. van (2001-02-01). "S Doradus variables in the Galaxy and the Magellanic Clouds". Astronomy & Astrophysics. 366 (2): 508–531. Bibcode:2001A&A...366..508V. doi:10.1051/0004-6361:20000022. ISSN 0004-6361. S2CID 55796300.
- ^ a b Richardson, Noel D.; Mehner, Andrea (2018-07-11). "The 2018 Census of Luminous Blue Variables in the Local Group". Research Notes of the AAS. 2 (3): 121. arXiv:1807.04262. Bibcode:2018RNAAS...2..121R. doi:10.3847/2515-5172/aad1f3. ISSN 2515-5172.
- ^ Pickering, E. C.; Fleming, W. P. (1901-09-01). "Objects having peculiar spectra" (PDF). The Astrophysical Journal. 14: 144–146. Bibcode:1901ApJ....14..144P. doi:10.1086/140844. ISSN 0004-637X.
- ^ Smith, Henry J. (1957-04-01). "Spectra of Bright-Line Stars in the Large Magellanic Cloud". Publications of the Astronomical Society of the Pacific. 69 (407): 137. Bibcode:1957PASP...69..137S. doi:10.1086/127032. ISSN 1538-3873. S2CID 122612430.
- ^ Balona, L A; Handler, G; Chowdhury, S; Ozuyar, D; Engelbrecht, C A; Mirouh, G M; Wade, G A; David-Uraz, A; Cantiello, M (2019-05-21). "Rotational modulation in TESS B stars". Monthly Notices of the Royal Astronomical Society. 485 (3): 3457–3469. arXiv:1902.09470. doi:10.1093/mnras/stz586. ISSN 0035-8711.
- ^ van Genderen, A. M.; Groot, M.; The, P. S. (1983-01-01). "On the photometric differences between luminous OBA type stars in the LMC with and without P Cygni characteristics". Astronomy and Astrophysics. 117: 53–59. Bibcode:1983A&A...117...53V. ISSN 0004-6361.
- ^ Stahl, O.; Wolf, B. (1987-07-01). "The peculiar emission-line supergiant HD 37836". Astronomy and Astrophysics. 181: 293–299. Bibcode:1987A&A...181..293S. ISSN 0004-6361.
- ^ Lortet, M. C. (1988-12-01). "A provisory catalogue of S-Dor candidate stars in the Magellanic Clouds". Bulletin d'Information du Centre de Donnees Stellaires. 35: 145–154. Bibcode:1988BICDS..35..145L. ISSN 1169-8837.
- ^ van Genderen, A. M.; Sterken, C.; de Groot, M.; Reijns, R. A. (1998-04-01). "Light variations of massive stars (alpha Cyg variables). XV. The LMC supergiants R99 (LBV), R103, R123 (LBV) and R128". Astronomy and Astrophysics. 332: 857–866. Bibcode:1998A&A...332..857V. ISSN 0004-6361.
