Astronomy:HD 73468

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Short description: Star in the constellation Volcans
HD 73468
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas/yr
Dec.: +73.054[1] mas/yr
Parallax (π)7.7564 ± 0.0247[1] mas
Distance420 ± 1 ly
(128.9 ± 0.4 pc)
Absolute magnitude (MV)+0.69[7]
Details[8]
Mass2.11±0.06 M☉
Radius10.24±0.16 R☉
Luminosity59±1 L☉
Surface gravity (log g)2.73±0.06 cgs
Temperature5,001±32 K
Metallicity [Fe/H]−0.09±0.03 dex
Rotational velocity (v sin i)2.1±1.3[9] km/s
Other designations
CD−72°471, CPD−72°713, GC 11776, HD 73468, HIP 41907, HR 3417, SAO 256524[10][11]
Database references
SIMBADdata

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 solar luminosity 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. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 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 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. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711. Bibcode: 2012MNRAS.419.1637L. 
  4. ↑ 4.0 4.1 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. ↑ 5.0 5.1 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. ↑ 6.0 6.1 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. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 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. 
  9. ↑ 9.0 9.1 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. 
  10. ↑ "HR 3417". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+3417. 
  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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