LHA 120-S 79

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]
Distance	50,000 pc
Absolute magnitude (MV)	−4.725
Details[4]
Radius	35.09[lower-alpha 1] R☉
Luminosity	14,073 L☉
Temperature	10,624 K
Other designations
	OGLE LMC-T2CEP-199, 2MASS J05044482-6858317[5]
Database references
SIMBAD	data

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.

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

Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
${\sqrt {(5772/10624)^{4}*14,073}}=35.09\ R\odot$

References

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.
Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
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.
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.
"LHA 120-S 79". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.

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[RadiusCalculationFromTemperatureLuminosity-5] Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
${\sqrt {(5772/10624)^{4}*14,073}}=35.09\ R\odot$

[edr3-1] 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.

[ucac4-2] Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.

[reid2012-3] 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.

[manick-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.

[simbad-6] "LHA 120-S 79". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.