 H Scorpii and the dark clouds Barnard 231 Credit: DECaPS DR2 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16 36 22.47192 |
| Declination | −35° 15′ 19.1803″ |
| Apparent magnitude (V) | 4.18 |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K6III |
| B−V color index | 1.535±0.069 |
| Astrometry | |
| Radial velocity (Rv) | −2.10±0.7 km/s |
| Proper motion (μ) | RA: 15.61±0.17 mas/yr Dec.: 11.33±0.14 mas/yr |
| Parallax (π) | 9.52 ± 0.16 mas |
| Distance | 343 ± 6 ly (105 ± 2 pc) |
| Absolute magnitude (MV) | −0.84±0.037 |
| Details | |
| Mass | 1.06+0.74 −0.28 M☉ 1.81 M☉ |
| Radius | 52.79±5.47 R☉ |
| Luminosity | 389 L☉ 562 L☉ 582±147 L☉ |
| Surface gravity (log g) | 1.30±0.15 cgs |
| Temperature | 3,875±21 K |
| Metallicity | 0.00±0.20 dex −0.30 dex |
| Rotational velocity (v sin i) | 3.1 km/s |
| Age | 2.18 Gyr |
| Other designations | |
| H Sco, NSV 7844, CD−34° 11112, GC 22311, HD 149447, HIP 81304, HR 6166, SAO 207814, PPM 295235 | |
| Database references | |
| SIMBAD | data |
H Scorpii (H Sco) is a single star in the southern constellation Scorpius. It is faintly visible to the naked eye with an apparent visual magnitude of 4.18. 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. This star was initially given the Bayer designation Beta Normae by Lacaille but it was later reassigned from Norma to Scorpius.
This is an aging giant star with a stellar classification of K6III. 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. The star is about 2.2 billion years old with only a mild level of magnetic activity, and is spinning with a projected rotational velocity of 3.1 km/s. It is radiating 4–600 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,875 K.
References
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- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- 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.
- ^ 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.
- ^ 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.
- ^ 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.
- "H Sco". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-12.
- 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.
- Ridpath, Ian (June 28, 2018). "Norma, the Set Square". Ian Ridpath's Star Tales. Retrieved 2021-11-13.
