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LHA 120-S 79 is an RV Tauri variable star located in the Large Magellanic Cloud, located about 163,000 light years away in the constellation of Dorado, with a period of 37.203 days. The star is extremely hot for a star of its type, as its temperature is over 10,000 K,[4] and it is hot enough to be classified as a B-type blue giant, as well as being the hottest star of its type in the LMC. LHA 120-S 79 is also extremely luminous, at over 14,000 L☉,[4] and it is the most luminous known star of its type in the galaxy.

LHA 120-S 79
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 04m 44.84888s[1]
Declination −68° 58′ 31.5436″[1]
Apparent magnitude (V) 13.77[2]
Characteristics
Spectral type B2IIIe[3]
U−B color index -0.19[2]
B−V color index 0.84[2]
Variable type RV Tauri variable[4]
Astrometry
Proper motion (μ) RA: 1.672[1] mas/yr
Dec.: 0.061[1] mas/yr
Parallax (π)−0.0139 ± 0.0142 mas[1]
Distance50,000 pc
Absolute magnitude (MV)−4.725[citation needed]
Details[4]
Radius35.09[lower-alpha 1] R☉
Luminosity14,073 L☉
Temperature10,624 K
Other designations
OGLE LMC-T2CEP-199, 2MASS J05044482-6858317[5]
Database references
SIMBADdata

However, the star may be less luminous than it seems, as its spectral energy distribution is contaminated by a very nearby star, 2MASS J05044388−6858371, which is also a long-period variable star and is just 8 arcseconds from LHA 120-S 79.[4]


Notes


  1. Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:

References


  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  3. Reid, Warren A.; Parker, Quentin A. (September 2012). "Emission-line stars discovered in the UKST Hα survey of the Large Magellanic Cloud - I. Hot stars". Monthly Notices of the Royal Astronomical Society. 425 (11): 355–404. arXiv:1207.1950. Bibcode:2012MNRAS.425..355R. doi:10.1111/j.1365-2966.2012.21471.x. S2CID 118934356.
  4. Manick, Rajeev; Van Winckel, Hans; Kamath, Devika; Sekaran, Sanjay; Kolenberg, Katrien (2018-10-01). "The evolutionary nature of RV Tauri stars in the SMC and LMC". Astronomy and Astrophysics. 618: A21. arXiv:1806.08210. Bibcode:2018A&A...618A..21M. doi:10.1051/0004-6361/201833130. ISSN 0004-6361. S2CID 119404763.
  5. "LHA 120-S 79". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.


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