HV 888

HV 888, also known as WOH S140, is a red supergiant (RSG) star located in the Large Magellanic Cloud.[9] It is among the largest known stars, with a radius ranging from over 1,400 to nearly 2,000 times that of the Sun (R☉) and is also one of most luminous of its type with a range of nearly 300,000 to over 500,000 times that of the Sun (L☉).[10][5][6] The effective temperature is estimated to be around 3,500 K.[4] If placed at the center of the Solar System, it's photosphere would engulf the orbit of Jupiter and possibly even Saturn.

HV 888
The red supergiant HV 888 located in the LMC. Its position is circled.
Credit: Université de Strasbourg/CNRS
Observation data
Epoch J2000      Equinox
Constellation Dorado (LMC)
Right ascension 05h 04m 14.116s[1]
Declination −67° 27′ 06.40″[1]
Apparent magnitude (V) 11.861[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M4 Ia[3]
Apparent magnitude (K) 6.781[2]
Apparent magnitude (U) 15.876[2]
Apparent magnitude (B) 13.949[2]
Variable type SRc[3]
Astrometry
Radial velocity (Rv)291.53[1] km/s
Proper motion (μ) RA: 1.701[1] mas/yr
Dec.: 0.054[1] mas/yr
Distance50,000[4] pc
Details
Radius1,477[5]–1,974[4][lower-alpha 1] R☉
Luminosity302,000+29,000
−27,000[6] (190,000[7] – 527,000[4]) L☉
Surface gravity (log g)+0.5[4] cgs
Temperature3,442[8]–3,500[4][5] K
Other designations
WOH S140, 2MASS J05041413-6716143, IRAS 05042-6720
Database references
SIMBADdata

See also

Notes
  1. The radius of HV 888 can be calculated using the Stefan–Boltzmann law and the solar effective temperature of 5,772 K:


References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Bonanos, A. Z.; Massa, D. L.; Sewilo, M.; Lennon, D. J.; Panagia, N.; Smith, L. J.; Meixner, M.; Babler, B. L.; Bracker, S.; Meade, M. R.; Gordon, K. D.; Hora, J. L.; Indebetouw, R.; Whitney, B. A. (2009). "Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud". The Astronomical Journal. 138 (4): 1003–1021. arXiv:0905.1328. Bibcode:2009AJ....138.1003B. doi:10.1088/0004-6256/138/4/1003. S2CID 14056495.
  3. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. Groenewegen, M. A. T.; Sloan, G. C. (2018). "Luminosities and mass-loss rates of Local Group AGB stars and red supergiants". Astronomy & Astrophysics. 609: A114. arXiv:1711.07803. Bibcode:2018A&A...609A.114G. doi:10.1051/0004-6361/201731089. S2CID 59327105.
  5. Kamath, D.; Wood, P. R.; Van Winckel, H. (December 2015). "Optically visible post-AGB stars, post-RGB stars and young stellar objects in the Large Magellanic Cloud". Monthly Notices of the Royal Astronomical Society. 454 (2): 1468–1502. arXiv:1508.00670. Bibcode:2015MNRAS.454.1468K. doi:10.1093/mnras/stv1202. S2CID 59496789.
  6. Davies, Ben; Crowther, Paul A.; Beasor, Emma R. (2018). "The luminosities of cool supergiants in the Magellanic Clouds, and the Humphreys–Davidson limit revisited". Monthly Notices of the Royal Astronomical Society. 478 (3): 3138–3148. arXiv:1804.06417. Bibcode:2018MNRAS.478.3138D. doi:10.1093/mnras/sty1302. S2CID 59459492.
  7. Kastner, Joel H.; Thorndike, Stephen L.; Romanczyk, Paul A.; Buchanan, Catherine L.; Hrivnak, Bruce J.; Sahai, Raghvendra; Egan, Michael (2008). "The Large Magellanic Cloud's Top 250: Classification of the Most Luminous Compact 8 μm Sources in the Large Magellanic Cloud". The Astronomical Journal. 136 (3): 1221–1241. arXiv:astro-ph/0703584. Bibcode:2008AJ....136.1221K. doi:10.1088/0004-6256/136/3/1221. S2CID 117820349.
  8. Ren, Yi; Jiang, Bi-Wei (2020-07-20). "On the Granulation and Irregular Variation of Red Supergiants". The Astrophysical Journal. 898 (1): 24. arXiv:2006.06605. Bibcode:2020ApJ...898...24R. doi:10.3847/1538-4357/ab9c17. ISSN 1538-4357.
  9. "HV888". Simbad.
  10. Van Loon, J. Th.; Cioni, M.-R. L.; Zijlstra, A. A.; Loup, C. (2005). "An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch stars". Astronomy and Astrophysics. 438 (1): 273–289. arXiv:astro-ph/0504379. Bibcode:2005A&A...438..273V. doi:10.1051/0004-6361:20042555. S2CID 16724272.


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