Astronomy:HD 37836
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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]
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.[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]
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.[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]
References
 |  |
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940
- ↑ 2.0 2.1 2.2 2.3 2.4 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. doi:10.3847/1538-3881/ad011e. ISSN 0004-6256. Bibcode: 2023AJ....166..214M.
- ↑ 3.0 3.1 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" (in en). Astronomy & Astrophysics 603: A75. doi:10.1051/0004-6361/201630076. ISSN 0004-6361. Bibcode: 2017A&A...603A..75L.
- ↑ Genderen, A. M. van (2001-02-01). "S Doradus variables in the Galaxy and the Magellanic Clouds" (in en). Astronomy & Astrophysics 366 (2): 508–531. doi:10.1051/0004-6361:20000022. ISSN 0004-6361. Bibcode: 2001A&A...366..508V.
- ↑ 5.0 5.1 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. doi:10.3847/2515-5172/aad1f3. ISSN 2515-5172. Bibcode: 2018RNAAS...2..121R.
- ↑ Pickering, E. C.; Fleming, W. P. (1901-09-01). "Objects having peculiar spectra". The Astrophysical Journal 14: 144–146. doi:10.1086/140844. ISSN 0004-637X. Bibcode: 1901ApJ....14..144P. https://zenodo.org/record/2421319/files/article.pdf.
- ↑ Smith, Henry J. (1957-04-01). "Spectra of Bright-Line Stars in the Large Magellanic Cloud" (in en). Publications of the Astronomical Society of the Pacific 69 (407): 137. doi:10.1086/127032. ISSN 1538-3873. Bibcode: 1957PASP...69..137S.
- ↑ Balona, L A; Handler, G; Chowdhury, S; Ozuyar, D; Engelbrecht, C A; Mirouh, G M; Wade, G A; David-Uraz, A et al. (2019-05-21). "Rotational modulation in TESS B stars" (in en). Monthly Notices of the Royal Astronomical Society 485 (3): 3457–3469. 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. ISSN 0004-6361. Bibcode: 1983A&A...117...53V.
- ↑ Stahl, O.; Wolf, B. (1987-07-01). "The peculiar emission-line supergiant HD 37836". Astronomy and Astrophysics 181: 293–299. ISSN 0004-6361. Bibcode: 1987A&A...181..293S.
- ↑ 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. ISSN 1169-8837. Bibcode: 1988BICDS..35..145L.
- ↑ 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. ISSN 0004-6361. Bibcode: 1998A&A...332..857V.
