Astronomy:93 Herculis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 00m 03.41611s[1] |
| Declination | +16° 45′ 03.2855″[1] |
| Apparent magnitude (V) | 4.67[2] |
| Characteristics | |
| Spectral type | K0.5IIb[3] |
| B−V color index | 1.254±0.007[2] |
| Astrometry | |
| Radial velocity (Rv) | −24.47±0.20[4] km/s |
| Proper motion (μ) | RA: −6.878[1] mas/yr Dec.: −9.696[1] mas/yr |
| Parallax (π) | 4.5894 ± 0.3311[1] mas |
| Distance | 710 ± 50 ly (220 ± 20 pc) |
| Absolute magnitude (MV) | −1.85[2] |
| Details | |
| Radius | 47[5] R☉ |
| Luminosity | 868[5] L☉ |
| Surface gravity (log g) | 1.74[6] cgs |
| Temperature | 4,594[5] K |
| Metallicity [Fe/H] | −0.01[6] dex |
| Rotational velocity (v sin i) | 1.3[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
93 Herculis is a star located around 750[1] light years away from the Sun in the northern constellation of Hercules.[8] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.67[2] The brightness of the star is diminished by an extinction of 0.21 due to interstellar dust.[9] It is moving closer to the Earth with a heliocentric radial velocity of −24.5 km/s.[4] This star, together with 95 Her, 102 Her, and 109 Her, made up the obsolete constellation Cerberus.[10]
This object has a stellar classification of K0.5IIb,[3] which indicates it is an evolved bright giant. With the supply of hydrogen at its core exhausted, the star has expanded to 47 times the Sun's radius. It is radiating around 868 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,594 K.[5] It is generally deficient in metal elements, but appears weakly enhanced in barium and other heavier elements.[11] This is a suspected barium star and hence may have a white dwarf companion in orbit.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F.
- ↑ 6.0 6.1 Coelho, Paula R. T.; Bruzual, Gustavo; Charlot, Stéphane (2020). "To use or not to use synthetic stellar spectra in population synthesis models?". Monthly Notices of the Royal Astronomical Society 491 (2): 2025. doi:10.1093/mnras/stz3023. Bibcode: 2020MNRAS.491.2025C.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ 8.0 8.1 "93 Her". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=93+Her.
- ↑ Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
- ↑ Ridpath, Ian, Ian Ridpath's Star Tales - Cerberus, http://www.ianridpath.com/startales/cerberus.htm, retrieved 2019-06-16.
- ↑ Smith, G. R.; Harmer, D. L. (January 1982), "A differential curve-of-growth analysis of the candidate barium star 93 Her", Monthly Notices of the Royal Astronomical Society 198: 273–280, doi:10.1093/mnras/198.1.273, Bibcode: 1982MNRAS.198..273S.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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