Astronomy:HD 44506

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Short description: Star in the constellation of Columba
HD 44506
HD44506LightCurve.png
A light curve for HD 44506, plotted from TESS data[1]
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Columba
Right ascension  06h 20m 36.23979s[2]
Declination −34° 08′ 38.9169″[2]
Apparent magnitude (V) 5.52[3] (5.48 - 5.55)[4]
Characteristics
Spectral type B3 V[5]
U−B color index −0.89[6]
B−V color index −0.20[6]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)54±4[7] km/s
Proper motion (μ) RA: +0.641[2] mas/yr
Dec.: +20.709[2] mas/yr
Parallax (π)1.7701 ± 0.0990[2] mas
Distance1,800 ± 100 ly
(560 ± 30 pc)
Absolute magnitude (MV)−3.28[8]
Details
Mass12.2±0.3[9] M☉
Radius13.5+0.1−0.2[2] R☉
Luminosity (bolometric)18,951[10] L☉
Surface gravity (log g)3.21[2] cgs
Temperature16,838[11] K
Metallicity [Fe/H]−0.7801[2] dex
Rotational velocity (v sin i)220±22[12] km/s
Age13±2[9] Myr
Other designations
CD−34°2806, CPD−34°898, GC 8180, HD 44506, HIP 30143, HR 2288, SAO 196707[13]
Database references
SIMBADdata

HD 44506 is a solitary,[14] blue hued star located in the southern constellation Columba. The object is also called HR 2288, which is its Bright Star Catalog designation. It has an average apparent magnitude of 5.52,[3] making it faintly visible to the naked eye under ideal conditions. HD 44506 is located relatively far at a distance of 1,800 light years based on Gaia DR3 parallax measurements[2] but is receding with a heliocentric radial velocity of 54 km/s.[7]

Emission lines were first noticed in HD 44506's spectrum in 1964.[15] They were again observed by Karl G. Heinze.[16] It has been suspected to be variable since 1963,[17] but a 1977 search for β Cepheids found inconclusive results; the star is variable in the visual passband but not the ultraviolet passband.[18] As of 2017, the GCVS lists HD 44506 as a suspected variable.[4] In 1982, HD 44506 was officially catalogued as a Be star by Mecerdes Jaschek and Daniel Egret.[19]

This is a hot B-type main-sequence star with a stellar classification of B3 V.[5] It has 12.2 times the mass of the Sun and is estimated to be 13 million years old. HD 44506 has a radius of 13.5 R☉ and an effective temperature of 16,838 K. This yields a bolometric luminosity 18,951 times that of the Sun from its photosphere. Like many hot stars it spins rapidly, having a projected rotational velocity of 220 km/s.[12]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  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. ↑ 4.0 4.1 4.2 Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80–88. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S. 
  5. ↑ 5.0 5.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 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. 
  9. ↑ 9.0 9.1 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Bibcode: 2011MNRAS.410..190T. 
  10. ↑ 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. 
  11. ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  12. ↑ 12.0 12.1 Slettebak, A. (September 1982). "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars". The Astrophysical Journal Supplement Series 50: 55. doi:10.1086/190820. ISSN 0067-0049. Bibcode: 1982ApJS...50...55S. 
  13. ↑ "HD 44506". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+44506. 
  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. ↑ Jaschek, C.; Jaschek, M.; Kucewicz, B. (1964). "A Survey of Southern Be Stars". Zeitschrift für Astrophysik 59: 108. ISSN 0372-8331. Bibcode: 1964ZA.....59..108J. 
  16. ↑ Henize, K. G. (April 1976). "Observations of southern emission-line stars". The Astrophysical Journal Supplement Series 30: 491. doi:10.1086/190369. ISSN 0067-0049. Bibcode: 1976ApJS...30..491H. 
  17. ↑ Cousins, A. W. J.; Stoy, R. H. (1963). Photoelectric magnitudes and colours of southern stars. Bibcode: 1963pmcs.book.....C. 
  18. ↑ Balona, L. A. (1977). "A search for β Canis Majoris stars". Memoirs of the Royal Astronomical Society 84: 101. Bibcode: 1977MmRAS..84..101B. 
  19. ↑ Jaschek, M.; Egret, D. (April 1982). Catalog of Be stars. 98. pp. 261–263. doi:10.1007/978-94-009-8565-0_44. ISBN 978-90-277-1367-4. Bibcode: 1982IAUS...98..261J. 
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Further reading

Jerzykiewicz, M.; Sterken, C. (1977). "Search for beta Cephei stars south of declination -20 . I. Incidence of light variability among early B giants and subgiants - summer objects.". Acta Astronomica 27: 365–387. ISSN 0001-5237. Bibcode: 1977AcA....27..365J. 

Buscombe, W. (1 May 1970). "Line Strengths for Southern OB Stars -- IV: Emission-Line Profiles". Monthly Notices of the Royal Astronomical Society 148 (1): 79–85. doi:10.1093/mnras/148.1.79. ISSN 0035-8711. Bibcode: 1970MNRAS.148...79B. 

Jakate, S. M. (April 1979). "A search for Beta Cephei stars. III - Photometric studies of southern B-type stars". The Astronomical Journal 84: 552. doi:10.1086/112448. ISSN 0004-6256. Bibcode: 1979AJ.....84..552J. 



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