Astronomy:HD 31529

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Short description: Star in the constellation of Caelum
HD 31529
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Caelum[1]
Right ascension  04h 54m 54.81319s[2]
Declination −39° 37′ 42.9886″[2]
Apparent magnitude (V) 6.09±0.01[3]
Characteristics
Evolutionary stage red giant branch[2]
Spectral type K3 III[4]
B−V color index +1.42[5]
Astrometry
Radial velocity (Rv)28.4±0.4[6] km/s
Proper motion (μ) RA: −6.482[2] mas/yr
Dec.: +22.102[2] mas/yr
Parallax (π)3.4977 ± 0.0268[2] mas
Distance932 ± 7 ly
(286 ± 2 pc)
Absolute magnitude (MV)−1.73[1]
Details
Mass4.81+0.11−0.04[2] M☉
Radius54.06[7] R☉
Luminosity915[8] L☉
Surface gravity (log g)1.15[9] cgs
Temperature4,159±122[10] K
Metallicity [Fe/H]−0.12[11] dex
Rotational velocity (v sin i)2.1±1.3[12] km/s
Other designations
CD−39°1691, CPD−39°536, FK5 2371, GC 6016, HD 31529, HIP 22847, HR 1584, SAO 195400
Database references
SIMBADdata

HD 31529, also known as HR 1584, is a solitary, orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.09,[3] making it faintly visible to the naked eye if viewed under ideal conditions. This object is located relatively far at a distance of 932 light years based on parallax measurements from Gaia DR3,[2] but is receding with a heliocentric radial velocity of 28.4 km/s.[6] Eggen (1989) lists it as a member of the old disk population.[11]

This star was designated Pi Caeli by Johann Elert Bode in his 1801 Uranographia, but this is now no longer used.[13]

This is an evolved red giant star with a stellar classification of K3 III. It is currently on the red giant branch, generating energy by fusing hydrogen in a shell around its core. It has 4.8 times the mass of the Sun[2] and an enlarged radius of 54.06 R☉[7] due to its evolved state. It radiates 915 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 4,159 K.[10] HD 31529 is slightly metal deficient (76% solar iron abundance)[11] and spins modestly with a projected rotational velocity of 2.1 km/s.[12]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 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. 
  4. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  5. ↑ 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 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ 8.0 8.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  9. ↑ Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 11.2 Eggen, Olin J. (April 1989). "Large and kinematically unbiased samples of G- and K-type stars. IV - Evolved stars of the old disk population". Publications of the Astronomical Society of the Pacific 101: 366. doi:10.1086/132442. ISSN 0004-6280. Bibcode: 1989PASP..101..366E. 
  12. ↑ 12.0 12.1 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. 
  13. ↑ E-Rara.ch, 2026, https://www.e-rara.ch/zut/content/zoom/3341806 



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