Astronomy:HD 189080

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Short description: Star in the constellation of Telescopium
HD 189080
Telescopium constellation map.svg
Red circle.svg
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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