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HV 2112

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HV 2112
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Tucana
Right ascension 01h 10m 03.858s[1]
Declination −72° 36′ 52.62″[1]
Apparent magnitude (V) 13.7[2] (13.7-16.5[3])
Characteristics
Spectral type M3-7.5e[4]
Apparent magnitude (J) 10.020[1]
Apparent magnitude (H) 9.100[1]
Apparent magnitude (K) 8.723[1]
U−B color index +0.33[5]
B−V color index +1.80[5]
Astrometry
Radial velocity (Rv)157[2] km/s
Absolute magnitude (MV)−5.2[2]
Details[2]
Luminosity120,000 L☉
Surface gravity (log g)0.0 cgs
Temperature3,450 K
Other designations
HV 2112, 2MASS J01100385-7236526
Database references
SIMBADdata

HV 2112 is a red supergiant star in the Small Magellanic Cloud. It is considered to be the most likely candidate for a Thorne–Żytkow object. It was identified using the Magellan Clay telescope in Chile.[6][2] The star contains unusually high levels of the elements lithium, molybdenum and rubidium.[6] To find a candidate Thorne–Żytkow object Emily Levesque used the Apache Point Observatory to examine 24 red supergiant stars in the Milky Way, and the Magellan Clay telescope to look at 16 in the Large Magellanic Cloud and 22 in the Small Magellanic Cloud.[7]

References

  1. ^ a b c d e Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C.
  2. ^ a b c d e Levesque, Emily (1 September 2014). "Discovery of a Thorne-̇Żytkow object candidate in the Small Magellanic Cloud". Monthly Notices of the Royal Astronomical Society: Letters. 443: L94. arXiv:1406.0001. Bibcode:2014MNRAS.443L..94L. doi:10.1093/mnrasl/slu080.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  3. ^ Leavitt, Henrietta S. (1908). "1777 variables in the Magellanic Clouds". Annals of Harvard College Observatory. 60: 87. Bibcode:1908AnHar..60...87L.
  4. ^ Wood, P. R.; Bessell, M. S.; Fox, M. W. (1983). "Long-period variables in the Magellanic Clouds - Supergiants, AGB stars, supernova precursors, planetary nebula precursors, and enrichment of the interstellar medium". Astrophysical Journal. 272: 99. Bibcode:1983ApJ...272...99W. doi:10.1086/161265.
  5. ^ a b Boyer, Martha L.; Srinivasan, Sundar; Van Loon, Jacco Th.; McDonald, Iain; Meixner, Margaret; Zaritsky, Dennis; Gordon, Karl D.; Kemper, F.; Babler, Brian; Block, Miwa; Bracker, Steve; Engelbracht, Charles W.; Hora, Joe; Indebetouw, Remy; Meade, Marilyn; Misselt, Karl; Robitaille, Thomas; Sewiło, Marta; Shiao, Bernie; Whitney, Barbara (2011). "Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). II. Cool Evolved Stars". The Astronomical Journal. 142 (4): 103. arXiv:1106.5026. Bibcode:2011AJ....142..103B. doi:10.1088/0004-6256/142/4/103.
  6. ^ a b Eller, Cynthia (30 June 2014). "Kip Thorne discusses first discovery of Thorne-Zytkow object". Retrieved 30 June 2014.
  7. ^ "First Thorne-Zytkow Object Found 200,000 Light-Years Away". 5 June 2014. Retrieved 30 June 2014.
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