HD 32515

HD 32515 (HR 1635) is a solitary star located in the southern constellation Caelum. It has an apparent magnitude of 5.9,[2] making it faintly visible to the naked eye under ideal conditions. The star is situated at a distance of 326 light years[1] but is recceding with a heliocentric radial velocity of 29.4 km/s.[5]

HD 32515
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 05h 02m 22.8045s[1]
Declination −31° 46′ 16.8028″[1]
Apparent magnitude (V) 5.90 ± 0.01[2]
Characteristics
Spectral type K2 III[3]
B−V color index +1.17[4]
Astrometry
Radial velocity (Rv)29 ± 4[5] km/s
Proper motion (μ) RA: −6.866[1] mas/yr
Dec.: +84.982[1] mas/yr
Parallax (π)10.0579 ± 0.0324 mas[1]
Distance324 ± 1 ly
(99.4 ± 0.3 pc)
Absolute magnitude (MV)+0.91
Details
Mass1.52[6] M☉
Radius11.9[1] R☉
Luminosity56.3+2.6
−2.5[7] L☉
Surface gravity (log g)2.44+0.11
−0.10[8] cgs
Temperature4540 ± 100[7] K
Metallicity [Fe/H]0.00[7] dex
Rotational velocity (v sin i)1.4±1.2[9] km/s
Age4.59[6] Gyr
Other designations
26 G. Caeli, CD−31° 2163, CPD−31° 684, GC 6169, HD 32515, HIP 23446, HR 1635, SAO 195509
Database references
SIMBADdata

HD 32515 has a stellar classification of K2 III,[3] indicating that it is an early K-type giant star. HD 32515 has an angular diameter of 1.03±0.07 mas[10] (after limb darkening correction); this yields a diameter 11.9 times that of the Sun at its estimated distance. At present, it has 152%[6] of the Sun's mass and shines at 56.3[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,540 K,[7] giving it an orange glow. HD 32515 has a similar metallicity[7] and age[6] to the Sun and spins slowly with a projected rotational velocity of 1.4 km/s

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 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. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40.0° to -26.0°. Bibcode:1982mcts.book.....H.
  4. 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.
  5. 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.
  6. Luck, R. Earle (1 September 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. S2CID 118505114.
  7. Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (1 January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. S2CID 204907220.
  8. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  9. 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.
  10. Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv:1009.0137. Bibcode:2010SPIE.7734E..4EL. doi:10.1117/12.857024. S2CID 32097037.
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