Astronomy:HD 24479

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Short description: Star in the constellation Camelopardalis
HD 24479
Camelopardalis constellation map.svg
Red circle.svg
Location of HD 117566 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  03h 57m 25.44460s[1]
Declination +63° 04′ 20.1498″[1]
Apparent magnitude (V) 5.04[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 IV[4] or B9.5 V[5]
U−B color index −0.16[2]
B−V color index −0.10[2]
Astrometry
Radial velocity (Rv)4.6±2.8[6] km/s
Proper motion (μ) RA: +7.146[1] mas/yr
Dec.: +6.420[1] mas/yr
Parallax (π)8.4614 ± 0.0947[1] mas
Distance385 ± 4 ly
(118 ± 1 pc)
Absolute magnitude (MV)−0.27[7]
Details
Mass3.14±0.05[3] M☉
Radius4.08±0.20[8] R☉
Luminosity156+12−11[3] L☉
Surface gravity (log g)3.69±0.06[9] cgs
Temperature10,520+72−73[3] K
Metallicity [Fe/H]−0.20[10] dex
Rotational velocity (v sin i)85±16[11] km/s
Age256±20[12] Myr
Other designations
22 H. Camelopardalis,[13]BD+62°628, FK5 2281, GC 4730, HD 24479, HIP 18505, HR 1204, SAO 12969[14]
Database references
SIMBADdata

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.[2] Based on Gaia DR3 parallax measurements,[1] 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.[6] 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,[5] matching a B-type main-sequence star. Slettebak (1982) gave it a class of B9 IV,[4] 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.[3]

It has an estimated 3.14 times the mass of the Sun[3] 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.[3] 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. ↑ 2.0 2.1 2.2 2.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system.". VizieR Online Data Catalog. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 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. 
  5. ↑ 5.0 5.1 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. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C. 
  6. ↑ 6.0 6.1 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. 
  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 8.2 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  11. ↑ 11.0 11.1 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. ISSN 0004-637X. Bibcode: 1982ApJS...50...55S. 
  12. ↑ 12.0 12.1 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. ISSN 1063-7737. Bibcode: 2012AstL...38..694G. 
  13. ↑ Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics 516: A29. doi:10.1051/0004-6361/201014003. ISSN 0004-6361. Bibcode: 2010A&A...516A..29V. 
  14. ↑ "HD 24479". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+24479. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  17. ↑ Wilson, Olin C., Jr. (April 1932). "Three New Be Stars". Publications of the Astronomical Society of the Pacific 44 (258): 124. doi:10.1086/124211. ISSN 0004-6280. Bibcode: 1932PASP...44..124W. 

External links



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