HD 44506

HD 44506

A light curve for HD 44506, plotted from TESS data[1]
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	06^h 20^m 36.23979^s[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 mas/yr[2] Dec.: +20.709 mas/yr[2]
Parallax (π)	1.7701 ± 0.0990 mas[2]
Distance	1,800 ± 100 ly (560 ± 30 pc)
Absolute magnitude (MV)	−3.28[8]
Details
Mass	12.2±0.3[9] M☉
Radius	13.5^+0.1 −0.2[2] R☉
Luminosity (bolometric)	18,951[10] L☉
Surface gravity (log g)	3.21[2] cgs
Temperature	16,838[11] K
Metallicity [Fe/H]	−0.7801[2] dex
Rotational velocity (v sin i)	220±22[12] km/s
Age	13±2[9] Myr
Other designations
90 G. Columbae[13], CD−34°2806, CPD−34°898, GC 8180, HD 44506, HIP 30143, HR 2288, SAO 196707[14]
Database references
SIMBAD	data

HD 44506 is a solitary,[15] 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.[16] They were again observed by Karl G. Heinze.[17] It has been suspected to be variable since 1963,[18] but a 1977 search for β Cepheids found inconclusive results; the star is variable in the visual passband but not the ultraviolet passband.[19] 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.[20]

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. Retrieved 13 December 2022.
2. 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.
3. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (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.
4. 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. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
5. 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. 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.
7. 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
8. 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.
9. 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. 410 (1). Oxford University Press (OUP): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711.
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. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
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. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.
12. 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. Bibcode:1982ApJS...50...55S. doi:10.1086/190820. eISSN 1538-4365. ISSN 0067-0049.
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 44506". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 9, 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. Jaschek, C.; Jaschek, M.; Kucewicz, B. (1964). "A Survey of Southern Be Stars". Zeitschrift für Astrophysik. 59: 108. Bibcode:1964ZA.....59..108J. ISSN 0372-8331.
17. Henize, K. G. (April 1976). "Observations of southern emission-line stars". The Astrophysical Journal Supplement Series. 30: 491. Bibcode:1976ApJS...30..491H. doi:10.1086/190369. eISSN 1538-4365. ISSN 0067-0049.
18. Cousins, A. W. J.; Stoy, R. H. (1963). Photoelectric magnitudes and colours of southern stars. Bibcode:1963pmcs.book.....C.
19. Balona, L. A. (1977). "A search for β Canis Majoris stars". Memoirs of the Royal Astronomical Society. 84: 101. Bibcode:1977MmRAS..84..101B.
20. Jaschek, M.; Egret, D. (April 1982). Catalog of Be stars. Vol. 98. pp. 261–263. Bibcode:1982IAUS...98..261J. doi:10.1007/978-94-009-8565-0_44 (inactive 1 January 2025). ISBN 978-90-277-1367-4.

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. Bibcode:1977AcA....27..365J. ISSN 0001-5237.

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. Bibcode:1970MNRAS.148...79B. doi:10.1093/mnras/148.1.79. eISSN 1365-2966. ISSN 0035-8711.

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