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HD 49947
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Volans
Right ascension 06h 43m 36.7555s [1]
Declination −73° 07′ 05.5512″ [1]
Apparent magnitude (V) 6.36 [2]
Characteristics
Evolutionary stage Horizontal branch [3]
Spectral type G8 III [4]
U−B color index +0.66 [5]
B−V color index +0.96 [5]
Astrometry
Radial velocity (Rv)15.88±0.84 [6] km/s
Proper motion (μ) RA: +11.312  mas/ yr [1]
Dec.: −98.389  mas/ yr [1]
Parallax (π)7.1106 ± 0.0193  mas [1]
Distance459 ± 1  ly
(140.6 ± 0.4  pc)
Absolute magnitude (MV)+0.68 [2]
Details [7]
Mass2.07±0.06  M☉
Radius10.33±0.13  R☉
Luminosity58.3±0.9  L☉
Surface gravity (log g)2.65±0.06  cgs
Temperature4,964±25  K
Metallicity [Fe/H]−0.17±0.02  dex
Rotational velocity (v sin i)1.1±1.4 [8] km/s
Age1.27 [9]  Gyr
Other designations
3 G. Volantis, CD−72°351, CPD−72°522, FK5 2522, GC 8881, HD 49947, HIP 32222, HR 2531, SAO 256330 [10] [11]
Database references
SIMBAD data

HD 49947 (HR 2531) is a solitary star in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.36, placing it near the max naked eye visibility. Parallax measurements place the object at a distance of 459 light years but is receding with a heliocentric radial velocity of 15.88  km/s

HD 49947 has a stellar classification of G8 III [4] and is a red clump giant, meaning that it is located on the warm end of the horizontal branch. [3] At present it has double the mass of the Sun [7] and at an age of 1.27 billion years, [9] has expanded to an enlarged radius of 10.33  solar radii. [7] It radiates at 61 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,964  K, [7] giving a yellow hue. HD 49947 is metal deficient with an iron abundance 68% that of Sun [7] and spins very slowly. [8]

References

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b 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. ISSN  1063-7737. S2CID  255204555.
  3. ^ a b Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv: 1109.4800. Bibcode: 2012MNRAS.419.1637L. doi: 10.1111/j.1365-2966.2011.19826.x. ISSN  0035-8711.
  4. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode: 1975mcts.book.....H.
  5. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode: 1966CoLPL...4...99J.
  6. ^ Steinmetz, Matthias; et al. (27 July 2020). "The Sixth Data Release of the Radial Velocity Experiment (Rave). II. Stellar Atmospheric Parameters, Chemical Abundances, and Distances". The Astronomical Journal. 160 (2): 83. arXiv: 2002.04512. Bibcode: 2020AJ....160...83S. doi: 10.3847/1538-3881/ab9ab8. eISSN  1538-3881.
  7. ^ a b c d e 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. ISSN  0004-6361.
  8. ^ a b 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. ISSN  0004-6361.
  9. ^ a b Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178 (1): 89–101. arXiv: 0804.4473. Bibcode: 2008ApJS..178...89D. doi: 10.1086/589654. eISSN  1538-4365. ISSN  0067-0049.
  10. ^ "HD 92209". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 13, 2022.
  11. ^ 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.
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