Astronomy:104 Herculis

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Short description: Star in the constellation Hercules
104 Herculis
V669HerLightCurve.png
A visual band light curve for V669 Herculis. The main plot shows the long-term variation (plotted from data published by Tabur et al.[1]) and the inset plot shows the short-term periodic variation (adapted from Adelman and William[2]).
Observation data
Equinox J2000.0]] (ICRS)
Constellation Hercules
Right ascension  18h 11m 54.15649s[3]
Declination +31° 24′ 19.2469″[3]
Apparent magnitude (V) 4.96[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M3 III[6]
B−V color index 1.643±0.004[4]
Variable type semiregular[7]
Astrometry
Radial velocity (Rv)−1.19±0.29[4] km/s
Proper motion (μ) RA: −15.172[3] mas/yr
Dec.: +25.084[3] mas/yr
Parallax (π)5.8167 ± 0.1769[3] mas
Distance560 ± 20 ly
(172 ± 5 pc)
Absolute magnitude (MV)−1.15[4]
Details
Radius85.80+6.65
−10.88
[3] R
Luminosity1,202.3±42.1[3] L
Surface gravity (log g)0.99±0.29[8] cgs
Temperature3,535±24[8] K
Metallicity [Fe/H]−0.08±0.10[8] dex
Other designations
A Her, 104 Her, V669 Her, BD+31°3199, FK5 3448, HD 167006, HIP 89172, HR 6815, SAO 66737[9][10]
Database references
SIMBADdata


104 Herculis is a solitary[11] variable star[2] located around 560[3] light years away from the Sun in the northern constellation of Hercules.[9] 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.[4] It is moving closer to the Earth with a heliocentric radial velocity of −1.2 km/s.[4]

This is an aging red giant star on the asymptotic giant branch[5] with a stellar classification of M3 III.[6] It is a semiregular variable[7] with an amplitude of 0.14 in the B-band[12] and pulsation periods of 22.9 and 24.0 days.[1] Having exhausted the hydrogen at its core, the star has expanded to 86[3] times the Sun's radius. It is radiating 1,202[3] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,535 K.[8]

References

  1. 1.0 1.1 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, doi:10.1111/j.1365-2966.2009.15588.x, Bibcode2009MNRAS.400.1945T. 
  2. 2.0 2.1 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, Bibcode2006BaltA..15..363A. 
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 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. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. 4.0 4.1 4.2 4.3 4.4 4.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  5. 5.0 5.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode1992AJ....104..275E. 
  6. 6.0 6.1 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, Bibcode1989ApJS...71..245K. 
  7. 7.0 7.1 Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society 378 (4): 1543–1549, doi:10.1111/j.1365-2966.2007.11903.x, Bibcode2007MNRAS.378.1543G. 
  8. 8.0 8.1 8.2 8.3 Prugniel, Ph. et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769, Bibcode2011A&A...531A.165P. 
  9. 9.0 9.1 "104 Her". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=104+Her. 
  10. 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. Bibcode2004yCat.4027....0K. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  12. Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode2017ARep...61...80S.