astro.wikisort.org - Star
V1936 Aquilae is a blue supergiant and candidate Luminous blue variable located in the nebula Westerhout 51, in the constellation Aquila, about 20,000 light years away. The star was originally identified as a massive star in 2000,[2] and was thought to be an O-type supergiant. However, subsequent analyses have shown it to be not O but B-type, as well as being possibly an LBV.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 23m 47.64168s[1] |
| Declination | 14° 36′ 39.06463″[1] |
| Apparent magnitude (V) | 15.1 |
| Characteristics | |
| Evolutionary stage | Blue supergiant |
| Spectral type | O4I[2] |
| Variable type | cLBV[3] |
| Astrometry | |
| Parallax (π) | 0.5076 ± 0.1157 mas[1] |
| Distance | 6,000[4] pc |
| Details | |
| Mass | 25[4] M☉ |
| Radius | 143.4[lower-alpha 1] R☉ |
| Luminosity | 562,000[4] L☉ |
| Temperature | 13,213[4] K |
| Other designations | |
LS1, 2MASS J19234764+1436391 | |
| Database references | |
| SIMBAD | data |
Properties
V1936 Aquilae is a very luminous star. Recent measurements hint at a bolometric luminosity of around 560,000 suns, assuming a distance of 6 kiloparsecs, consistent with the distance of Westerhout 51, the very large H II region (nebula) it is located in. The star likely has a temperature of around 13,200 Kelvins.[4] The Stefan-Boltzmann Law suggests a radius of around 143 times that of the Sun.
Notes
- Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
References
- Gaia Collaboration (2018-04-01). "VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)". VizieR Online Data Catalog. 1345. Bibcode:2018yCat.1345....0G.
- Okumura, Shin-ichiro; Mori, Atsushi; Nishihara, Eiji; Watanabe, Etsuji; Yamashita, Takuya (2000-11-01). "The Initial Mass Function of a Massive Star-forming Region W51". The Astrophysical Journal. 543 (2): 799–821. Bibcode:2000ApJ...543..799O. doi:10.1086/317116. ISSN 0004-637X.
- Smith, Nathan; Aghakhanloo, Mojgan; Murphy, Jeremiah W.; Drout, Maria R.; Stassun, Keivan G.; Groh, Jose H. (2019-09-01). "On the Gaia DR2 distances for Galactic luminous blue variables". Monthly Notices of the Royal Astronomical Society. 488 (2): 1760–1778. Bibcode:2019MNRAS.488.1760S. doi:10.1093/mnras/stz1712. ISSN 0035-8711.
- Bik, A.; Henning, Th.; Wu, S. -W.; Zhang, M.; Brandner, W.; Pasquali, A.; Stolte, A. (2019-04-01). "Near-infrared spectroscopy of the massive stellar population of W51: evidence for multi-seeded star formation". Astronomy and Astrophysics. 624: A63. arXiv:1902.05460. Bibcode:2019A&A...624A..63B. doi:10.1051/0004-6361/201935061. ISSN 0004-6361. S2CID 118711844.
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