Astronomy:HD 72922

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Short description: Star in the constellation Chamaleon
HD 72922
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 72922 on the map (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Chamaeleon
Right ascension  08h 24m 19.8867s[1]
Declination −80° 54′ 51.2175″[1]
Apparent magnitude (V) 5.67[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type G8 III[4]
U−B color index +0.74[5]
B−V color index +1.02[5]
Astrometry
Radial velocity (Rv)27.5±0.6[6] km/s
Proper motion (μ) RA: −149.123[1] mas/yr
Dec.: +226.547[1] mas/yr
Parallax (π)11.8882 ± 0.111[1] mas
Distance274 ± 3 ly
(84.1 ± 0.8 pc)
Absolute magnitude (MV)+1.27[2]
Details[7]
Mass0.96±0.04 M☉
Radius9.65±0.17 R☉
Luminosity41.2±0.9 L☉
Surface gravity (log g)2.56±0.12 cgs
Temperature4,708±34 K
Metallicity [Fe/H]−0.43±0.03 dex
Rotational velocity (v sin i)<1[8] km/s
Other designations
CD−80°290, CPD−80°258, FK5 2664, GC 11625, HD 72922, HIP 41191, HR 3393, SAO 258496[9]
Database references
SIMBADdata

HD 72922, also known as HR 3393, is a suspected astrometric binary[10] located in the southern circumpolar constellation Chamaeleon. A 1993 paper by Olin J. Eggen lists it as a member of the Milky Way's old disk population.[11]

It has an apparent magnitude of 5.67,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, the system is estimated to be 274 light years away from the Solar System.[1] However, it is receding with a heliocentric radial velocity of 27.5 km/s.[6] At its current distance, HD 72922's brightness is diminished by magnitudes due to interstellar dust. It has an absolute magnitude of +1.27.[2]

The visible component is an evolved red giant with a stellar classification of G8 III. It is currently on the horizontal branch,[3] fusing helium at its core. It has 96% the mass of the Sun and an enlarged radius of 9.65 R☉.[7] It radiates 41.2 times the luminosity of the Sun from its photosphere at an effective temperature of 4,708 K, giving it a yellowish hue.[7] HD 72922 is metal poor with a metallicity only 37% that of the Sun;[7] it spins too slowly to be measured.[8]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 2.2 2.3 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. 
  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. ↑ 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°. 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. ↑ 7.0 7.1 7.2 7.3 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. 
  8. ↑ 8.0 8.1 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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  9. ↑ "HD 72922". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+72922. 
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal 106: 80. doi:10.1086/116622. Bibcode: 1993AJ....106...80E. 
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