HD 49947

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HD 49947
Observation data
Epoch J2000      Equinox J2000
Constellation Volans
Right ascension 06h 43m 36.76s[1]
Declination −73° 07′ 05.55″[1]
Apparent magnitude (V) 6.36[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.96[2]
Astrometry
Radial velocity (Rv)+16.56±0.40[1] km/s
Proper motion (μ) RA: +11.241±0.035[1] mas/yr
Dec.: −98.496±0.043[1] mas/yr
Parallax (π)7.0287 ± 0.0210[1] mas
Distance464 ± 1 ly
(142.3 ± 0.4 pc)
Absolute magnitude (MV)+0.68[2]
Details
Mass2.21±0.10[4] M☉
Radius10.64+0.49
−0.44[1] R☉
Luminosity61.4±0.3[1] L☉
Surface gravity (log g)2.80[5] cgs
Temperature4,984[5] K
Metallicity [Fe/H]−0.14±0.02[4] dex
Rotational velocity (v sin i)1.1±1.4[6] km/s
Age975±168[4] Myr
Other designations
3 G. Volantis, CD−72 351, HD 49947, HIP 32222, HR 2531, SAO 256330, GSC 09185-01225
Database references
SIMBADdata

HD 49947 (HR 2531) is a solitary star in the southern constellation Volans. With an apparent magnitude of 6.36, it's barely visible to the naked eye under ideal conditions. The star is located 464 light-years (142 parsecs) based on parallax, but is drifting away with a heliocentric radial velocity of +16.56 km/s.

Properties[]

HD 49947 has double the Sun's mass, and at an age of 975 million years, has expanded to 10.64 times the Sun's radius. It radiates at 61 times the Sun's luminosity from it's enlarged photosphere at an effective temperature of 4,984 K. HD 49947 is metal-deficient, with only 72% the abundance of heavy metals compared to the Sun, and has a projected rotational velocity of 1.1 km/s.

References[]

  1. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c Anderson, E.; Francis, Ch. (1 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 119257644.
  3. ^ 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_f0". University of Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume I. Declinations -90_ to -53_f0., by Houk, N.; Cowley, A. P.. Ann Arbor, MI (USA): Department of Astronomy, University of Michigan, 19 + 452 P. Bibcode:1975mcts.book.....H.
  4. ^ a b c 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. (1 February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity". Astronomy and Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. S2CID 229331727.
  5. ^ a b Alves, S.; Benamati, L.; Santos, N. C.; Adibekyan, V. Zh.; Sousa, S. G.; Israelian, G.; De Medeiros, J. R.; Lovis, C.; Udry, S. (1 April 2015). "Determination of the spectroscopic stellar parameters for 257 field giant stars*". Monthly Notices of the Royal Astronomical Society. 448: 2749–2765. arXiv:1503.02556. Bibcode:2015MNRAS.448.2749A. doi:10.1093/mnras/stv189. ISSN 0035-8711.
  6. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. S2CID 54046583.
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