HD 24479

Last updated
HD 24479
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 117566 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Camelopardalis [1]
Right ascension 03h 57m 25.44460s [2]
Declination +63° 04 20.1498 [2]
Apparent magnitude  (V)5.04 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type B9 IV [5] or B9.5 V [6]
U−B color index −0.16 [3]
B−V color index −0.10 [3]
Astrometry
Radial velocity (Rv)4.6±2.8 [7] km/s
Proper motion (μ)RA: +7.146 [2] mas/yr
Dec.: +6.420 [2] mas/yr
Parallax (π)8.4614±0.0947  mas [2]
Distance 385 ± 4  ly
(118 ± 1  pc)
Absolute magnitude  (MV)−0.27 [1]
Details
Mass 3.14±0.05 [4]   M
Radius 4.08±0.20 [8]   R
Luminosity 156+12
11
[4]   L
Surface gravity (log g)3.69±0.06 [9]   cgs
Temperature 10,520+72
73
[4]   K
Metallicity [Fe/H]−0.20 [10]   dex
Rotational velocity (v sin i)85±16 [11]  km/s
Age 256±20 [12]   Myr
Other designations
22 H. Camelopardalis, [13] AG+62°326, BD+62°628, FK5 2281, GC 4730, HD 24479, HIP 18505, HR 1204, SAO 12969 [14]
Database references
SIMBAD data

HD 24479, also designated as HR 1204, is a solitary, [15] bluish-white hued star located in the northern circumpolar constellation Camelopardalis. The star is visible to the naked eye with an apparent visual magnitude of 5.04. [3] Based on Gaia DR3 parallax measurements, [2] it is located 385 light years from the Sun. However, it is receding with a somewhat constrained heliocentric radial velocity of 4.6  km/s . [7] At its current distance, HD 24479's brightness is diminished by 0.29 magnitudes due to interstellar dust. [16]

In 1932, HD 24479 was identified as a Be star by Olin C. Wilson at the Mount Wilson Observatory. [17] In 1969, astronomer Anne Cowley and her colleauges listed a stellar classification of B9.5 V, [6] matching a B-type main-sequence star. Slettebak (1982) gave it a class of B9 IV, [5] suggesting this instead an evolving subgiant star. Zorec and Royer (2012) model it to be an evolved dwarf star that has completed 85.9% of its main sequence lifetime. [4]

It has an estimated 3.14 times the mass of the Sun [4] and 4.1 times the Sun's radius, [8] which is large for its class. The star is radiating 156 times the Sun's luminosity [8] from its photosphere at an effective temperature of 10,250  K . [4] HD 24479 is estimated to be 256 million years old [12] and is spinning quickly with a projected rotational velocity of 85  km/s . [11]

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 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. 1 2 3 4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
  4. 1 2 3 4 5 6 7 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi: 10.1051/0004-6361/201117691 . eISSN   1432-0746. ISSN   0004-6361. S2CID   55586789.
  5. 1 2 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.
  6. 1 2 Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN   0004-6256.
  7. 1 2 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. 1 2 3 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  9. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  10. 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 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:1982ApJS...50...55S. doi: 10.1086/340590 . eISSN   1538-4357. ISSN   0004-637X.
  12. 1 2 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv: 1606.09028 . Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN   1562-6873. ISSN   1063-7737. S2CID   255202762.
  13. Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics. 516: A29. Bibcode:2010A&A...516A..29V. doi: 10.1051/0004-6361/201014003 . eISSN   1432-0746. ISSN   0004-6361.
  14. "HD 24479". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-05-24.
  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. 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. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
  17. Wilson, Olin C. Jr. (April 1932). "Three New Be Stars". Publications of the Astronomical Society of the Pacific. 44 (258): 124. Bibcode:1932PASP...44..124W. doi:10.1086/124211. eISSN   1538-3873. ISSN   0004-6280.