HD 179433

Last updated
HD 179433
Corona Australis constellation map.svg
Red circle.svg
Location of HD 179433 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
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  mas [1]
Distance 329 ± 1  ly
(101.0 ± 0.4  pc)
Absolute magnitude  (MV)+1.11 [6]
Details [7]
Mass 2.45±0.04  M☉
Radius 8.26±0.14  R☉
Luminosity 43.3±1.0  L☉
Surface gravity (log g)2.88±0.07  cgs
Temperature 5,120±30  K
Metallicity [Fe/H]−0.004±0.027  dex
Rotational velocity (v sin i)2.9±1 [8]  km/s
Age 727±10 [9]   Myr
Other designations
49 G. Coronae Australis [10] , CD−45°13054, CPD−45°9650, GC  26485, HD  179433, HIP  94556, HR  7281, SAO  229573 [11]
Database references
SIMBAD data

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 [12] 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]

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<span class="mw-page-title-main">HD 175219</span> K-type giant; Corona Australis

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<span class="mw-page-title-main">HD 101917</span> High proper motion star

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<span class="mw-page-title-main">HD 182893</span> Star in the constellation Telescopium

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<span class="mw-page-title-main">HD 189080</span> Star in the constellation of Telescopium

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<span class="mw-page-title-main">HD 185075</span> Star in the constellation Telescopium

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References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  2. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361. S2CID   17128864.
  3. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 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. Bibcode:1971MNSSA..30...37C. ISSN   0024-8266.
  5. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  6. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  7. 1 2 3 4 5 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (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. arXiv: 2201.01528 . Bibcode:2022A&A...657A..87O. doi: 10.1051/0004-6361/202040078 . eISSN   1432-0746. ISSN   0004-6361. S2CID   245440163.
  8. 1 2 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. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361. S2CID   54046583.
  9. 1 2 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (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. arXiv: 2012.10199 . Bibcode:2021A&A...646A..77G. doi: 10.1051/0004-6361/202039765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   229331727.
  10. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  11. ↑ "HD 179433". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 4, 2023.
  12. ↑ 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. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
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