H Scorpii

H Scorpii (H Sco) is a single[11] star in the southern constellation Scorpius. It is faintly visible to the naked eye with an apparent visual magnitude of 4.18.[2] The star is located at a distance of approximately 343 light-years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −2 km/s.[5] This star was initially given the Bayer designation Beta Normae by Lacaille but it was later reassigned from Norma to Scorpius.[12]

H Scorpii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 16h 36m 22.47192s[1]
Declination −35° 15′ 19.1803″[1]
Apparent magnitude (V) 4.18[2]
Characteristics
Evolutionary stage giant[3]
Spectral type K6III[4]
B−V color index 1.535±0.069[2]
Astrometry
Radial velocity (Rv)−2.10±0.7[5] km/s
Proper motion (μ) RA: 15.61±0.17 mas/yr[1]
Dec.: 11.33±0.14 mas/yr[1]
Parallax (π)9.52 ± 0.16 mas[1]
Distance343 ± 6 ly
(105 ± 2 pc)
Absolute magnitude (MV)−0.84±0.037[6]
Details
Mass1.06+0.74
−0.28 M☉[7]
1.81[8] M☉
Radius52.79±5.47[3] R☉
Luminosity389 L☉[7]
562 L☉[8]
582±147[3] L☉
Surface gravity (log g)1.30±0.15[3] cgs
Temperature3,875±21[8] K
Metallicity [Fe/H]0.00±0.20 dex[3]
−0.30[7] dex
Rotational velocity (v sin i)3.1[9] km/s
Age2.18[8] Gyr
Other designations
H Sco, NSV 7844, CD−34° 11112, GC 22311, HD 149447, HIP 81304, HR 6166, SAO 207814, PPM 295235[10]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K6III.[4] After exhausting the supply of hydrogen at its core, this star cooled and expanded off the main sequence. It now has around 53 times the radius of the Sun.[3] The star is about 2.2[8] billion years old with only a mild level of magnetic activity, and is spinning with a projected rotational velocity of 3.1 km/s.[9] It is radiating 4–600 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,875 K.[8]

References
  1. van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Decin, L.; et al. (March 2003). "ISO-SWS calibration and the accurate modelling of cool-star atmospheres. IV. G9 to M2 stars". Astronomy and Astrophysics. 400 (2): 709–727. arXiv:astro-ph/0207653. Bibcode:2003A&A...400..709D. doi:10.1051/0004-6361:20021786. S2CID 55244849.
  4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 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. Park, Sunkyung; et al. (2013). "Wilson-Bappu Effect: Extended to Surface Gravity". The Astronomical Journal. 146 (4): 73. arXiv:1307.0592. Bibcode:2013AJ....146...73P. doi:10.1088/0004-6256/146/4/73. S2CID 119187733.
  7. Charbonnel, C.; et al. (2020-01-01). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. S2CID 204907220.
  8. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  9. Pérez Martínez, M. I.; et al. (November 2014). "The non-active stellar chromosphere: Ca II basal flux". Monthly Notices of the Royal Astronomical Society. 445 (1): 270–279. Bibcode:2014MNRAS.445..270P. doi:10.1093/mnras/stu1706.
  10. "H Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-12.
  11. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  12. Ridpath, Ian (June 28, 2018). "Norma, the Set Square". Ian Ridpath's Star Tales. Retrieved 2021-11-13.
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