Astronomy:HD 39901

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Short description: Star in the constellation Columba
HD 39901
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Columba
Right ascension  05h 53m 22.85088s[1]
Declination −42° 55′ 16.7853″[1]
Apparent magnitude (V) 6.54±0.01[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.37[4]
Astrometry
Radial velocity (Rv)−10.3±0.4[5] km/s
Proper motion (μ) RA: +5.109[1] mas/yr
Dec.: +11.405[1] mas/yr
Parallax (π)5.1076 ± 0.0152[1] mas
Distance639 ± 2 ly
(195.8 ± 0.6 pc)
Absolute magnitude (MV)−0.03[6]
Details
Mass1.27[7] M☉
Radius21.9[8] R☉
Luminosity143±1[9] L☉
Surface gravity (log g)1.87[7] cgs
Temperature4,373±122[10] K
Metallicity [Fe/H]+0.08[11] dex
Rotational velocity (v sin i)<1.6[12] km/s
Other designations
CD−42°2205, CPD−42°769, GC 7431, HD 39901, HIP 27835, HR 2069, SAO 217599[13]
Database references
SIMBADdata

HD 39901 is an orange hued star located in the constellation Columba. It is also called HR 2069, which is the star's Bright Star Catalog designation. Eggen (1989) lists it as a member of the old disk population.[11]

Despite the HR designation, the object has an apparent magnitude of 6.54,[2] slightly past the limit for the naked eye visibility. As a result, it is barely visible to the unaided eye in the best conditions. Parallax measurements from the Gaia spacecraft place the object 639 light years away.[1] It is approaching the Solar System with a heliocentric radial velocity of −10.3 km/s.[5] At that distance, HD 39901's brightness is diminished by 0.33 magnitudes due to interstellar dust.[14] It has an absolute magnitude of −0.03.[6]

This is an evolved red giant star with a stellar classification of K3 III.[3] It has a comparable mass to the Sun[7] but has expanded to 21.9 times the latter's girth.[8] It radiates 143 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,373 K.[10] HD 39901 is slightly enriched in heavy elements with a metallicity 120% that of the Sun's.[11] Like most giants, it spins slowly, having a projected rotational velocity lower than 1.6 km/s.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  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 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode: 1978mcts.book.....H. 
  4. ↑ Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa 30 (4): 37. ISSN 0024-8266. Bibcode: 1971MNSSA..30...37C. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  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. ↑ "HD 39901". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+39901. 
  14. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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