HV 888

HV 888, also known as WOH S140, is a red supergiant (RSG) star located in the Large Magellanic Cloud.[10] It is among the largest known stars, with estimates of its radius ranging from 765 R☉ to over 1,700 R☉, and is also one of the most luminous of its type with a range of nearly 300,000 to over 500,000 times that of the Sun (L☉).[11][9][7] The effective temperature is estimated to be around 3,500 K.[5] If placed at the center of the Solar System, its 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) 11.57[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M4 Ia[3]
Apparent magnitude (K) 6.781[4]
Apparent magnitude (U) 15.876[4]
Apparent magnitude (B) 13.949[4]
Variable type SRc[3]
Astrometry
Radial velocity (Rv)291.53[1] km/s
Proper motion (μ) RA: +1.773[1] mas/yr
Dec.: +0.049[1] mas/yr
Parallax (π)0.0079 ± 0.0173 mas[1]
Distance50,000[5] pc
Details
Mass25[6] M☉
Radius762[1]-1,765[6] R☉
Luminosity302,000+29,000
−27,000[7] (190,000[8] – 527,000[5]) L☉
Surface gravity (log g)+0.5[5] cgs
Temperature3,442[6]–3,500[5][9] K
Other designations
WOH S140, 2MASS J05041413-6716143, IRAS 05042-6720
Database references
SIMBADdata

The apparent magnitude of HV 888 is variable, with an amplitude of 0.59 magnitudes around a mean value of about 11.57.[2] It is classified as a semiregular variable of type SRc indicating a cool supergiant.[3] Variations in its radial velocity have led to the suggestion that it is a binary.[12]

See also

References
  1. 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. Gaia DR3 record for this source at VizieR.
  2. "LMC V0852". International Variable Star Index. AAVSO. Retrieved 2023-01-11.
  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. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. "HV888". Simbad.
  11. 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.
  12. Dorda, R.; Patrick, L. R. (2021). "Multiplicity among the cool supergiants in the Magellanic Clouds". Monthly Notices of the Royal Astronomical Society. 502 (4): 4890. arXiv:2010.15627. Bibcode:2021MNRAS.502.4890D. doi:10.1093/mnras/stab303.
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