HD 47500

Last updated
HD 47500
Observation data
Epoch J2000       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 mas/yr [6]
Dec.: +11.625 mas/yr [6]
Parallax (π)2.9218±0.2076  mas [6]
Distance 1,120 ± 80  ly
(340 ± 20  pc)
Absolute magnitude  (MV)−1.93 [7]
Details
A
Mass 5.01±0.05 [8]   M☉
Radius 7.33 [9]   R☉
Luminosity 1,482+665
−459 [2]   L☉
Surface gravity (log g)3.61 [10]   cgs
Temperature 14,703±290 [11]   K
Metallicity [Fe/H]−0.07 [10]   dex
Rotational velocity (v sin i)36 [12]  km/s
Age 34±1 [2]   Myr
Other designations
112 G. Columbae [13] , CD−36°3031, CPD−36°1014, GC 8658, HD 47500, HIP 31637, HR 2446, SAO 197014, WDS J06372-3659AB [14]
Database references
SIMBAD The system
A
B

HD 47500, also known as HR 2446, is a binary star [15] 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. [16] 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. [17]

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, [18] indicating that it is already a giant star, while Houk (1982) gave it a class of B5/7 IV, [19] 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 2 3 4 5 6 7 8 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. Bibcode:2002A&A...384..180F. doi: 10.1051/0004-6361:20011822 . eISSN   1432-0746. ISSN   0004-6361.
  2. 1 2 3 4 5 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361.
  3. 1 2 Oblak, E.; Chareton, M. (September 1981). "On the Estimation of Photometric Spectral Types". Astronomy and Astrophysics Supplement Series. 45: 459. Bibcode:1981A&AS...45..459O. ISSN   0365-0138.
  4. 1 2 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. Bibcode:1976ApJS...30...97D. doi: 10.1086/190359 . eISSN   1538-4365. ISSN   0067-0049.
  5. 1 2 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. arXiv: 0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN   1521-3994. ISSN   0004-6337. S2CID   119323941.
  6. 1 2 3 4 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 .
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  8. 1 2 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. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. eISSN   1521-3994. ISSN   0004-6337. S2CID   111387483.
  9. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 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. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361.
  11. 1 2 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. arXiv: astro-ph/0509049 . Bibcode:2005A&A...444..941P. doi: 10.1051/0004-6361:20053546 . eISSN   1432-0746. ISSN   0004-6361.
  12. 1 2 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. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  14. ↑ "HD 47500". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 14, 2022.
  15. ↑ 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. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711.
  16. ↑ 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.
  17. ↑ 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. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256.
  18. ↑ 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.
  19. ↑ 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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