Astronomy:LHA 120-S 79
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 50,000 pc |
| Absolute magnitude (MV) | −4.725[citation needed] |
| Details[4] | |
| Radius | 35.09[lower-alpha 1] R☉ |
| Luminosity | 14,073 L☉ |
| Temperature | 10,624 K |
| Other designations | |
| 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 RV Tauri variable 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:
- [math]\displaystyle{ \sqrt{(5772/10624)^4 * 14,073} = 35.09\ R\odot }[/math]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 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. doi:10.1111/j.1365-2966.2012.21471.x. Bibcode: 2012MNRAS.425..355R.
- ↑ 4.0 4.1 4.2 4.3 4.4 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. doi:10.1051/0004-6361/201833130. ISSN 0004-6361. Bibcode: 2018A&A...618A..21M.
- ↑ "LHA 120-S 79". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LHA+120-S+79.
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