HD 73468

Last updated
HD 73468
Observation data
Epoch J2000       Equinox J2000
Constellation Volans
Right ascension 08h 32m 41.77s [1]
Declination −73° 21′ 24.44″ [1]
Apparent magnitude  (V)6.10±0.01 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type G8 III [4]
U−B color index +0.65 [5]
B−V color index +0.95 [5]
Astrometry
Radial velocity (Rv)−26.5±0.4 [6] km/s
Proper motion (μ)RA: −54.973 mas/yr [1]
Dec.: +73.054 mas/yr [1]
Parallax (π)7.7564±0.0247  mas [1]
Distance 420 ± 1  ly
(128.9 ± 0.4  pc)
Absolute magnitude  (MV)+0.69 [7]
Details [8]
Mass 2.11±0.06  M☉
Radius 10.24±0.16  R☉
Luminosity 59±1  L☉
Surface gravity (log g)2.73±0.06  cgs
Temperature 5,001±32  K
Metallicity [Fe/H]−0.09±0.03  dex
Rotational velocity (v sin i)2.1±1.3 [9]  km/s
Other designations
33 G. Volantis, CD−72°471, CPD−72°713, GC 11776, HD 73468, HIP 41907, HR 3417, SAO 256524 [10] [11]
Database references
SIMBAD data

HD 73468 (HR 3417) is a solitary star in the southern circumpolar constellation Volans. It is faintly visible to the naked eye with an apparent magnitude of 6.10, [2] and is estimated to be 420 light years away based on parallax measurements. [1] However, it is approaching the Solar System with a heliocentric radial velocity of −26.5  km/s . [6]

HD 73468 is a star with a classification of G8 III, [4] indicating that it is a giant star. It is currently on the horizontal branch [3] — generating energy via helium fusion in its core. HD 73468 has twice the mass of the Sun but has expanded to 10.24 times the radius of the Sun. [8] It shines with a luminosity of 59  L☉ from its swollen photosphere at an effective temperature of 5,001 K, [8] giving a yellow hue. HD 73468 is metal deficient with an iron abundance 81% that of the Sun [8] and spins with a projected rotational velocity of about 2.1  km/s . [9]

See also

References

  1. 1 2 3 4 5 6 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. 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.
  3. 1 2 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. 1 2 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. 1 2 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. 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. ISSN   1063-7737. S2CID   119231169.
  7. ↑ 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   119257644.
  8. 1 2 3 4 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.
  9. 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 . ISSN   0004-6361.
  10. ↑ "HR 3417". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 21, 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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