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89 Herculis

From Wikipedia, the free encyclopedia
Star in the constellation Hercules
89 Herculis
Location of 89 Her (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationHercules
Right ascension17h 55m 25.18845s[1]
Declination+26° 02′ 59.9701″[1]
Apparent magnitude (V)5.34 - 5.54[2]
Characteristics
Evolutionary stagepost-AGB[3]
Spectral typeF2Ibe[3]
U−Bcolor index−0.34[4]
B−Vcolor index+0.34[4]
Variable typeSRd[2]
Astrometry
Radial velocity (Rv)−28.5[5] km/s
Proper motion (μ)RA: 3.894[1]mas/yr
Dec.: 5.193[1]mas/yr
Parallax (π)0.6893±0.0718 mas[1]
Distanceapprox. 4,700 ly
(approx. 1,500 pc)
Absolute magnitude (MV)−6.5[6]
Orbit[7]
Period (P)288.36 days
Eccentricity (e)0.189
Semi-amplitude (K1)
(primary)		3.09 km/s
Details
89 Her A
Mass1.0[8] M☉
Radius71.0[8] R☉
Luminosity8,350[8] L☉
Surface gravity (log g)0.55[3] cgs
Temperature6,550[3] K
Metallicity−0.5[3]
Rotational velocity (v sin i)23[9] km/s
Other designations
89 Her,V441 Herculis,AAVSO 1751+26,BD+26°3120,FK5 1468,GC 24382,HD 163506,HIP 87747,HR 6685,SAO 85545[10]
Database references
SIMBADdata

89 Herculis is abinary star system located about 4,700 light years away from the Sun in the northernconstellation ofHercules. It is visible to the naked eye as a faint, fifth magnitude star. The system is moving closer to the Earth with a heliocentricradial velocity of −28.5 km/s.[5]

This is aspectroscopic binary with the pair surrounded by a dusty disc, and an hourglass-shapednebula formed from outflowing gas.[11] The mass of the nebula is about 0.018 M☉, of which a majority is in the outflow.[11] The system shows variable brightness and spectral line profiles.[12] The companion has a very low mass and luminosity and orbits the primary in 288 days.[3]

Avisual bandlight curve for V441 Herculis, adapted from Fernie and Seager (1995)[13]

The primary component has astellar classification of F2Ibe,[3] and is among a rare class of post-asymptotic giant branch stars – low-mass stars in the last stages of their lives, highly inflated to appear as supergiants.[3] It is classified as asemiregular variable star, subtype SRd, and ranges from magnitude 5.3 down to 5.5 over a period of around 68 days.[2] The star has expanded to 71[8] times theSun's radius and is radiating 8,350[8] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 6,550 K.[3]

References

[edit]
  1. ^abcdeBrown, 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.
  2. ^abcSamus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.1.Bibcode:2009yCat....102025S.
  3. ^abcdefghiHillen, M.; Verhoelst, T.; Van Winckel, H.; Chesneau, O.; Hummel, C. A.; Monnier, J. D.; Farrington, C.; Tycner, C.; Mourard, D.; Ten Brummelaar, T.; Banerjee, D. P. K.; Zavala, R. T. (2013). "An interferometric study of the post-AGB binary 89 Herculis. I. Spatially resolving the continuum circumstellar environment at optical and near-IR wavelengths with the VLTI, NPOI, IOTA, PTI, and the CHARA Array".Astronomy & Astrophysics.559: A111.arXiv:1308.6715.Bibcode:2013A&A...559A.111H.doi:10.1051/0004-6361/201321616.S2CID 119182156.
  4. ^abDucati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system".CDS/ADC Collection of Electronic Catalogues.2237.Bibcode:2002yCat.2237....0D.
  5. ^abWilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities".Washington.Bibcode:1953GCRV..C......0W.
  6. ^Kipper, Tõnu (2011)."On the Optical Spectrum of 89 Her".Baltic Astronomy.20: 65.Bibcode:2011BaltA..20...65K.doi:10.1515/astro-2017-0269.
  7. ^Waters, L. B. F. M.; Waelkens, C.; Mayor, M.; Trams, N. R. (1993). "A model for the 89 Herculis system".Astronomy and Astrophysics.269: 242.Bibcode:1993A&A...269..242W.
  8. ^abcdeHillen, M.; Menu, J.; Van Winckel, H.; Min, M.; Gielen, C.; Wevers, T.; Mulders, G. D.; Regibo, S.; Verhoelst, T. (2014). "An interferometric study of the post-AGB binary 89 Herculis. II. Radiative transfer models of the circumbinary disk".Astronomy & Astrophysics.568: A12.arXiv:1405.1960.Bibcode:2014A&A...568A..12H.doi:10.1051/0004-6361/201423749.S2CID 6700179.
  9. ^Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue".New Haven.Bibcode:1991bsc..book.....H.
  10. ^"89 Her".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2019-06-15.
  11. ^abGallardo Cava, I.; Alcolea, J.; Bujarrabal, V.; Gómez-Garrido, M.; Castro-Carrizo, A. (2023). "The nebula around the binary post-AGB star 89 Herculis".Astronomy & Astrophysics.671: A80.arXiv:2301.06965.Bibcode:2023A&A...671A..80G.doi:10.1051/0004-6361/202244415.S2CID 255942182.
  12. ^Burki, G.; Mayor, M.; Rufener, F. (1980). "Study of the Variable F-Type Supergiants HD161796 and HD163506 in Radial Velocity and Photometry".Astronomy and Astrophysics Supplement.42: 383.Bibcode:1980A&AS...42..383B.
  13. ^Fernie, J. D.; Seager, S. (September 1995)."V441 Herculis (89 Her) and V814 Herculis (HD 161796) in 1993 and 1994".Publications of the Astronomical Society of the Pacific.107:853–855.Bibcode:1995PASP..107..853F.doi:10.1086/133632.S2CID 250751611.

External links

[edit]
  • Kaler's, James B."89 Herculis".Stars. University of Illinois. Retrieved2019-06-16.
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