Star in the constellation Hercules
104 Herculis 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 dataEpoch J2000 Equinox J2000 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−Vcolor index ± 0.004[ 4] Variable type semiregular[ 7] Astrometry Radial velocity (Rv )± 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 mas [ 3] Distance 560 ± 20 ly pc ) Absolute magnitude (MV )−1.15[ 4] Details Radius +6.65 [ 3] R ☉ Luminosity ± 42.1[ 3] L ☉ Surface gravity (log g )± 0.29[ 8] cgs Temperature ± 24[ 8] K Metallicity ± 0.10[ 8] dex Other designations A Her ,104 Her ,V669 Her ,AAVSO 1808+31BBD +31°3199FK5 3448HD 167006HIP 89172HR 6815SAO 66737[ 9] [ 10] Database references SIMBAD data
104 Herculis is a solitary[ 11] variable star [ 2] [ 3] light years away from the Sun in the northernconstellation ofHercules .[ 9] variable star designation V669 Herculis and theBayer designation A Herculis , while104 Herculis is theFlamsteed designation . This object is visible to thenaked eye as a dim, red-hued point of light with a baselineapparent visual magnitude of 4.96.[ 4] radial velocity of −1.2 km/s.[ 4]
Thevariability of the brightness of 104 Herculis was announced byJoel Stebbins andCharles Morse Huffer in 1928, based on observations made atWashburn Observatory .[ 12] [ 13]
This is an agingred giant star on theasymptotic giant branch [ 5] stellar classification of M3 III.[ 6] semiregular variable [ 7] amplitude of 0.14 in theB-band [ 14] [ 1] core , the star has expanded to 86[ 3] Sun's radius . It is radiating 1,202[ 3] Sun's luminosity from its swollenphotosphere at aneffective temperature of 3,535 K.[ 8]
^a b 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 S2CID 15358380 . ^a b 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 . ^a b c d e f g h i j 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 atVizieR .^a b c d e f 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 . ^a b 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 . ^a b 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 ,S2CID 123149047 . ^a b Glass, I. S.; Van Leeuwen, F. (2007), "Semiregular variables in the solar neighbourhood",Monthly Notices of the Royal Astronomical Society ,378 (4):1543– 1549,arXiv :0704.3150 Bibcode :2007MNRAS.378.1543G ,doi :10.1111/j.1365-2966.2007.11903.x S2CID 14332208 . ^a b c d 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 ,S2CID 54940439 . ^a b "104 Her" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-06-17 .^ 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 . ^ 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 . ^ Stebbins, Joel; Huffer, C. M. (1928)."The Constancy of the Light of Red Stars" .Publications of the Washburn Observatory .15 :137– 174.Bibcode :1928PWasO..15..137S . Retrieved5 December 2024 . ^ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977)."62nd Name-List of Variable Stars" (PDF) .Information Bulletin on Variable Stars .1248 :1– 25.Bibcode :1977IBVS.1248....1K . Retrieved8 December 2024 . ^ 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 ,S2CID 125853869 .
