Astronomy:HD 47500

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Short description: Binary star in the constellation Columba
HD 47500
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Columba
A
Right ascension  06h 37m 13.84s[1]
Declination −36° 59′ 26.37″[1]
Apparent magnitude (V) 5.91±0.01[1]
B
Right ascension  06h 37m 13.84s[1]
Declination −36° 59′ 25.91″[1]
Apparent magnitude (V) 7.51±0.01[1]
Characteristics
A
Evolutionary stage main sequence[2]
Spectral type B6 IV-V[3]
U−B color index −0.52[4]
B−V color index −0.12[4]
Astrometry
Radial velocity (Rv)21±4[5] km/s
Proper motion (μ) RA: −9.053[6] mas/yr
Dec.: +11.625[6] mas/yr
Parallax (π)2.9218 ± 0.2076[6] mas
Distance1,120 ± 80 ly
(340 ± 20 pc)
Absolute magnitude (MV)−1.93[7]
Details
A
Mass5.01±0.05[8] M☉
Radius7.33[9] R☉
Luminosity1,482+665
−459[2] L☉
Surface gravity (log g)3.61[10] cgs
Temperature14,703±290[11] K
Metallicity [Fe/H]−0.07[10] dex
Rotational velocity (v sin i)36[12] km/s
Age34±1[2] Myr
Other designations
CD−36°3031, CPD−36°1014, GC 8658, HD 47500, HIP 31637, HR 2446, SAO 197014, WDS J06372-3659AB[13]
Database references
SIMBADThe system
A
B

HD 47500, also known as HR 2446, is a binary star[14] in the southern constellation Columba. The primary has an apparent magnitude of 5.91,[1] making it faintly visible to the naked eye if viewed under ideal conditions. As for the companion, its visual magnitude is 7.51.[1] The system is located relatively far at a distance of 1,120 light years based on parallax measurements,[6] and is receding with a heliocentric radial velocity of 21 km/s.[5]

The binary nature of this system was first discovered by Richard Alfred Rossiter in 1942.[15] Their current separation is half of an arcsecond, making it difficult to measure the components properties. Nevertheless, the secondary component is located along a position angle of 4° as of 1999.[16]

HD 47500 has a stellar classification of B6 IV-V,[3] a B-type star with a luminosity class intermediate between a subgiant and main sequence star. Hube (1970) gave the primary a slightly cooler class of B7 III,[17] indicating that it is already a giant star, while Houk (1982) gave it a class of B5/7 IV,[18] intermediate between a B5 and B7 subgiant. Nevertheless, it is estimated to be 34 million years old, having completed 98.5% of its main sequence lifetime.[2] HD 47500 A has 5.01 times the mass of the Sun[8] and an enlarged radius of 7.33 R☉.[9] It radiates 1,482 times the luminosity of the Sun.[2] from its photosphere at an effective temperature of 14,703 K,[11] giving it a bluish-white hue. Unlike most hot stars, the object spins modestly with a projected rotational velocity of 36 km/s.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002). "The Tycho double star catalogue". Astronomy & Astrophysics 384 (1): 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  3. ↑ 3.0 3.1 Oblak, E.; Chareton, M. (September 1981). "On the Estimation of Photometric Spectral Types". Astronomy and Astrophysics Supplement Series 45: 459. ISSN 0365-0138. Bibcode: 1981A&AS...45..459O. 
  4. ↑ 4.0 4.1 Deutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976). "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-β photoelectric observations". The Astrophysical Journal Supplement Series 30: 97. doi:10.1086/190359. ISSN 0067-0049. Bibcode: 1976ApJS...30...97D. 
  5. ↑ 5.0 5.1 Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889–896. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K. 
  6. ↑ 6.0 6.1 6.2 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.
  7. ↑ 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. 
  8. ↑ 8.0 8.1 Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349–360. doi:10.1002/asna.200911355. ISSN 0004-6337. Bibcode: 2010AN....331..349H. 
  9. ↑ 9.0 9.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "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. 
  10. ↑ 10.0 10.1 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. 
  11. ↑ 11.0 11.1 Paunzen, E.; Schnell, A.; Maitzen, H. M. (December 2005). "An empirical temperature calibration for the Δa photometric system I: The B-type stars". Astronomy & Astrophysics 444 (3): 941–946. doi:10.1051/0004-6361:20053546. ISSN 0004-6361. Bibcode: 2005A&A...444..941P. 
  12. ↑ 12.0 12.1 Levato, H.; Grosso, M. (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Astronomical Society of the Pacific 215: 51. Bibcode: 2004IAUS..215...51L. 
  13. ↑ "HD 47500". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+47500. 
  14. ↑ 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. 
  15. ↑ Rossiter, Richard Alfred (1943). "Fourth list of new southern double stars found at the Lamont-Hussey Observatory of the University of Michigan, at Bloemfontein, Orange Free State, South Africa". Publications of Michigan Observatory 8 (10): 133–140. Bibcode: 1943POMic...8..133R. 
  16. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  17. ↑ Hube, Douglas P. (1970). "The radial velocities of 335 late B-type stars". Memoirs of the Royal Astronomical Society 72: 233. Bibcode: 1970MmRAS..72..233H. 
  18. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
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