Astronomy:HD 25291

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Short description: Star in the constellation Camelopardalis
HD 25291
location of HD 25291 in red
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  04h 04m 27.16294s[1]
Declination +59° 09′ 19.8327″[1]
Apparent magnitude (V) 5.12[2]
Characteristics
Spectral type F0 II[3]
U−B color index +0.47[2]
B−V color index +0.15[2]
Variable type constant[4]
Astrometry
Radial velocity (Rv)−20.3±0.8[5] km/s
Proper motion (μ) RA: −3.380[1] mas/yr
Dec.: +1.027[1] mas/yr
Parallax (π)1.5558 ± 0.1047[1] mas
Distance2,100 ± 100 ly
(640 ± 40 pc)
Absolute magnitude (MV)−3.91[6]
Details
Mass8.78±0.65[7] M☉
Radius50.1[8] R☉
Luminosity (bolometric)9,878[7] L☉
Surface gravity (log g)1.87[9] cgs
Temperature7,425[7] K
Metallicity [Fe/H]−0.07[9] dex
Rotational velocity (v sin i)6.8±2[10] km/s
Age32[9] Myr
Other designations
BD+58°690, FK5 2290, GC 4858, HD 25291, HIP 19018, HR 1242, SAO 24384[11]
Database references
SIMBADdata

HD 25291, also known as HR 1242, is a solitary,[12] yellowish-white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.12,[2] making it one of the brighter members of this generally faint constellation. The object is relatively far at a distant of approximately 2,100 light years[1] but is drifting closer with a heliocentric radial velocity of −20.3 km/s.[5]

HD 25291 has a general stellar classification of F0 II,[3] which indicates that it is an evolved early F-type bright giant. It has also been given a class of F2 Ia,[13] instead suggesting a slightly cooler and more luminous supergiant. Nevertheless, it has 8.8 times the mass of the Sun[7] but at an age of 32 million years,[9] it has expanded to 50.1 times its girth.[8] It radiates at a bolometric luminosity 9,878 times greather that of the Sun from its enlarged photosphere at an effective temperature of 7,425 K.[7] HD 25291 is slightly metal deficient, with an iron abundance 85% of solar levels.[9] It spins modestly with a projected rotational velocity of 6.8 km/s.[9]

Tetzlaff et al. (2011) found the object to be a runaway star with a peculiar velocity of 25.7+1.9
−4.1 km/s, which is high compared to neighboring stars.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 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 2237. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 Gray, R. O.; Napier, M. G.; Winkler, L. I. (April 2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal 121 (4): 2148–2158. doi:10.1086/319956. ISSN 0004-6256. Bibcode: 2001AJ....121.2148G. 
  4. ↑ Adelman, S. J.; Cay, I. H.; Cay, M. T.; Kocer, D. (September 2000). "On the Variability of A6 to F9 Supergiants". Information Bulletin on Variable Stars 4947: 1. ISSN 0374-0676. Bibcode: 2000IBVS.4947....1A. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Lyubimkov, Leonid S.; Lambert, David L.; Korotin, Sergey A.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (8 December 2014). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society 446 (4): 3447–3460. doi:10.1093/mnras/stu2299. ISSN 0035-8711. Bibcode: 2015MNRAS.446.3447L. 
  10. ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  11. ↑ "HR 1242". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+1242. 
  12. ↑ 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. 
  13. ↑ Hardorp, J.; Rohlfs, K.; Slettebak, A.; Stock, J. (1959). "Luminous stars in the Northern Milky Way. Part I.". Hamburger Sternw. Warner & Swasey Obs. C01: 0. Bibcode: 1959LS....C01....0H. 
  14. ↑ 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. 



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