Astronomy:HD 189080

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Short description: Star in the constellation of Telescopium
HD 189080
Location of HD 189080 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Telescopium
Right ascension  20h 00m 25.32793s[1]
Declination −49° 21′ 03.4019″[1]
Apparent magnitude (V) 6.18±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K0 III[4]
U−B color index +0.92[5]
B−V color index +1.06[5]
Astrometry
Radial velocity (Rv)66.9±0.4[6] km/s
Proper motion (μ) RA: −77.932[1] mas/yr
Dec.: −2.298[1] mas/yr
Parallax (π)9.1277 ± 0.0321[1] mas
Distance357 ± 1 ly
(109.6 ± 0.4 pc)
Absolute magnitude (MV)+1.10[7]
Details
Mass1.19+0.16−0.29[8] M☉
Radius9.9±0.5[9] R☉
Luminosity43.6±1.0[10] L☉
Surface gravity (log g)2.46+0.09−0.10[8] cgs
Temperature4,742±49[10] K
Metallicity [Fe/H]−0.11±0.03[10] dex
Rotational velocity (v sin i)<1[11] km/s
Age4.83+2.53−3.22[8] Gyr
Other designations
CD−49°12949, CPD−49°11118, FK5 3595, GC 27678, HD 189080, HIP 98482, HR 7621, SAO 229973[12]
Database references
SIMBADdata

HD 189080, also known as HR 7621 or rarely 74 G. Telescopii, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.18,[2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place it at a distance of 357 light years [1] and it is currently receding rapidly with a heliocentric radial velocity of 66.9 km/s.[6] At its current distance, HD 189080's brightness is diminished by 0.17 magnitudes due to extinction from interstellar dust.[13] It has an absolute magnitude of +1.1.[7]

This is an evolved red giant with a stellar classification of K0 III.[4] It is currently on the red giant branch,[3] fusing a hydrogen shell around an inert helium core. It has 119% the mass of the Sun, but at the age of 4.83 billion years[8] it has expanded to 9.9 times the radius of the Sun.[9] It radiates 43.6 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,742 K.[10] HD 189080 is slightly metal deficient with [Fe/H] = −0.11[10] and spins too slowly to be measured accurately.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics 536: A71. doi:10.1051/0004-6361/201117887. ISSN 0004-6361. Bibcode: 2011A&A...536A..71J. 
  4. ↑ 4.0 4.1 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. 2. Bibcode: 1978mcts.book.....H. 
  5. ↑ 5.0 5.1 Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Private Communication: 0. Bibcode: 1970Priv.........0O. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 Soto, M. G.; Jones, M. I.; Jenkins, J. S. (March 2021). "SPECIES. II. Stellar parameters of the EXPRESS giant star sample". Astronomy & Astrophysics 647: A157 (23). doi:10.1051/0004-6361/202039357. ISSN 0004-6361. Bibcode: 2021A&A...647A.157S. 
  9. ↑ 9.0 9.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O. 
  11. ↑ 11.0 11.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HD 189080". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+189080. 
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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