104 Herculis

104 Herculis is a solitary[9] variable star[10] located around 560[1] light years away from the Sun in the northern constellation of Hercules.[7] It has the variable star designation V669 Herculis and the Bayer designation A Herculis, while 104 Herculis is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with a baseline apparent visual magnitude of 4.96.[2] It is moving closer to the Earth with a heliocentric radial velocity of −1.2 km/s.[2]

104 Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension  18h 11m 54.15649s[1]
Declination +31° 24′ 19.2469″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M3 III[4]
B−V color index 1.643±0.004[2]
Variable type semiregular[5]
Astrometry
Radial velocity (Rv)−1.19±0.29[2] km/s
Proper motion (μ) RA: −15.172[1] mas/yr
Dec.: +25.084[1] mas/yr
Parallax (π)5.8167 ± 0.1769[1] mas
Distance560 ± 20 ly
(172 ± 5 pc)
Absolute magnitude (MV)−1.15[2]
Details
Radius85.80+6.65
−10.88[1] R☉
Luminosity1,202.3±42.1[1] L☉
Surface gravity (log g)0.99±0.29[6] cgs
Temperature3,535±24[6] K
Metallicity [Fe/H]−0.08±0.10[6] dex
Other designations
A Her, 104 Her, V669 Her, BD+31°3199, FK5 3448, HD 167006, HIP 89172, HR 6815, SAO 66737[7][8]
Database references
SIMBADdata

This is an aging red giant star on the asymptotic giant branch[3] with a stellar classification of M3 III.[4] It is a semiregular variable[5] with an amplitude of 0.14 in the B-band[11] and pulsation periods of 22.9 and 24.0 days.[12] Having exhausted the hydrogen at its core, the star has expanded to 86[1] times the Sun's radius. It is radiating 1,202[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,535 K.[6]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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.
  3. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  4. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 378 (4): 1543, arXiv:0704.3150, Bibcode:2007MNRAS.378.1543G, doi:10.1111/j.1365-2966.2007.11903.x.
  6. Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769.
  7. "104 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-17.
  8. Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
  9. 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.
  10. Adelman, Saul J.; Harrell, William L. (2006), "BVRI Photometry of nz Gem, HD 73017, HD 77247, RT Vir and 104 Her", Baltic Astronomy, 15: 363–381, Bibcode:2006BaltA..15..363A.
  11. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  12. Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–1961, arXiv:0908.3228, Bibcode:2009MNRAS.400.1945T, doi:10.1111/j.1365-2966.2009.15588.x.
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