Astronomy:HD 179433

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Short description: G-type giant; Corona Australis
HD 179433
Corona Australis constellation map.svg
Red circle.svg
Location of HD 179433 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Corona Australis
Right ascension  19h 14m 39.56095s[1]
Declination −45° 11′ 36.6990″[1]
Apparent magnitude (V) 5.91±0.01[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.90[4]
Astrometry
Radial velocity (Rv)−35.1±0.4[5] km/s
Proper motion (μ) RA: +47.604[1] mas/yr
Dec.: −39.804[1] mas/yr
Parallax (π)9.9058 ± 0.0428[1] mas
Distance329 ± 1 ly
(101.0 ± 0.4 pc)
Absolute magnitude (MV)+1.11[6]
Details[7]
Mass2.45±0.04 M☉
Radius8.26±0.14 R☉
Luminosity43.3±1.0 L☉
Surface gravity (log g)2.88±0.07 cgs
Temperature5,120±30 K
Metallicity [Fe/H]−0.004±0.027 dex
Rotational velocity (v sin i)2.9±1[8] km/s
Age727±10[9] Myr
Other designations
CD−45°13054, CPD−45°9650, GC 26485, HD 179433, HIP 94556, HR 7281, SAO 229573[10]
Database references
SIMBADdata

HD 179433, also known as HR 7281 or rarely 49 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.91.[2] Gaia DR3 parallax measurements imply a distance of 329 light-years,[1] and it is currently drifting closer with a heliocentric radial velocity of −35.1 km/s.[5] At its current distance, HD 179433's brightness is diminished by interstellar extinction of 0.22 magnitudes[11] and it has an absolute magnitude of +1.11.[6]

HD 179433 has a stellar classification of G8 III,[3] indicating that it is an evolved red giant. It has 2.45 times the mass of the Sun[7] but at the age of 727 million years,[9] it has expanded to 8.26 times the Sun's radius.[7] It radiates 43.3 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,120 K.[7] HD 197433 has a near solar metallicity at [Fe/H]= −0.0004[7] and it spins modestly with a projected rotational velocity of 2.9 km/s.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. 2. Bibcode: 1978mcts.book.....H. 
  4. ↑ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa 30 (4): 37. ISSN 0024-8266. Bibcode: 1971MNSSA..30...37C. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E. et al. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity". Astronomy & Astrophysics 646: A77. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Bibcode: 2021A&A...646A..77G. 
  10. ↑ "HD 179433". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+179433. 
  11. ↑ 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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