Astronomy:HD 34255

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Short description: Star in the constellation of Camelopardalis
HD 34255
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  05h 20m 22.61066s[1]
Declination +62° 39′ 13.3608″[1]
Apparent magnitude (V) 5.60±0.01[2]
Characteristics
Spectral type K4 I[3]
U−B color index +2.00[4]
B−V color index +1.75[4]
Astrometry
Radial velocity (Rv)−7.7±0.15[5] km/s
Proper motion (μ) RA: −3.105[1] mas/yr
Dec.: −2.373[1] mas/yr
Parallax (π)1.9726 ± 0.0788[1] mas
Distance1,650 ± 70 ly
(510 ± 20 pc)
Absolute bolometric
magnitude (Mbol)		−4.40±0.24[6]
Details
Mass6.9±0.9[7] M☉
Radius145[6] R☉
Luminosity6,101[8] L☉
Surface gravity (log g)1.14[9] cgs
Temperature3,927±170[6] K
Metallicity [Fe/H]−0.01±0.05[9] dex
Age46±6[7] Myr
Other designations
BD+62°742, FK5 2397, GC 6496, HD 34255, HIP 24914, HR 1720, SAO 13460[10]
Database references
SIMBADdata

HD 34255, also known HR 1720, is a star located in the northern circumpolar constellation Camelopardalis, the giraffe. It has an apparent magnitude of 5.60,[2] allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of about 1.65 kly[1] but is approaching the Solar System with a heliocentric radial velocity of −7.7 km/s.[5]

This is a solitary,[11] evolved red supergiant with a stellar classification of K4 I.[3] It has 6.9 times the mass of the Sun and is said to be 46 million years old.[7] Despite the young age, it has already ceased hydrogen fusion at its core and now has an enlarged radius of 145 R☉.[6] HD 34255 radiates a bolometric luminosity over 6,000 times that of the Sun[8] from its photosphere at an effective temperature of 3,927 K,[6] giving it an orange glow. The star's metallicity – what astronomers dub as elements heavier than helium – is around solar level.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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 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. 
  3. ↑ 3.0 3.1 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. ISSN 0004-637X. Bibcode: 1935ApJ....81..187A. 
  4. ↑ 4.0 4.1 Argue, A. N. (1 September 1966). "UBV Photometry of 550 F, G and K Type Stars". Monthly Notices of the Royal Astronomical Society 133 (4): 475–493. doi:10.1093/mnras/133.4.475. ISSN 0035-8711. Bibcode: 1966MNRAS.133..475A. 
  5. ↑ 5.0 5.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Messineo, M.; Brown, A. G. A. (18 June 2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal 158 (1): 20. doi:10.3847/1538-3881/ab1cbd. Bibcode: 2019AJ....158...20M. 
  7. ↑ 7.0 7.1 7.2 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. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 9.2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2 December 2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. ISSN 0004-6361. Bibcode: 2011A&A...525A..71W. 
  10. ↑ "HD 34255". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+34255. 
  11. ↑ 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. 



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