AH Scorpii

AH Scorpii (shortened as AH Sco) is a red supergiant variable star in the constellation Scorpius. It is a very large star at 1,411 times the radius of our Sun and one of the most luminous stars of its type. It is one of the largest stars in the Milky Way.

AH Scorpii
Location of AH Sco
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension  17h 11m 17.01945s[1]
Declination −32° 19′ 30.7140″[1]
Apparent magnitude (V) 6.5 - 9.6[2]
Characteristics
Spectral type M4-5 Ia-Iab[3]
B−V color index +2.57[4]
Variable type SRc[3]
Astrometry
Radial velocity (Rv)−13.40±2.4[5] km/s
Proper motion (μ) RA: −2.322±0.115[1] mas/yr
Dec.: −2.610±0.068[1] mas/yr
Parallax (π)0.5632 ± 0.0799[1] mas
Distance7,400 ly
(2,260[6] pc)
Absolute magnitude (MV)−5.8[7]
Details
Mass10[6] M☉
Radius1,411[4] R☉
Luminosity330,000+270,000
−150,000[4] L☉
Surface gravity (log g)−0.5[4] cgs
Temperature3,450[8] - 3,682[4] K
Other designations
AH Sco, AN 223.1907, GSC 07365-00527, HD 155161, HIP 84071, CD−32°12429, 2MASS J17111702-3219308, IRC−30282, IRAS 17080-3215, RAFGL 1927, AAVSO 1704-32
Database references
SIMBADdata

References
  1. Brown, A. G. A (2020). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. arXiv:2012.01553. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657.
  2. Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID 5203133.
  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. Bibcode:2009yCat....102025S.
  4. Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Hauschildt, P. H. (2013). "The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy & Astrophysics. 554: A76. arXiv:1305.6179. Bibcode:2013A&A...554A..76A. doi:10.1051/0004-6361/201220920. S2CID 73575062.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. Chen, Xi; Shen, Zhi-Qiang (2008). "VLBI Observations of SiO Masers around AH Scorpii". The Astrophysical Journal. 681 (2): 1574–1583. arXiv:0803.1690. Bibcode:2008ApJ...681.1574C. doi:10.1086/588186. S2CID 7603031.
  7. Baudry, A.; Le Squeren, A. M.; Lepine, J. R. D. (1977). "The supergiant OH stars S Per and AH SCO - Conditions for OH emission in circumstellar envelopes". Astronomy and Astrophysics. 54: 593. Bibcode:1977A&A....54..593B.
  8. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
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