Astronomy:HD 25274

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Short description: M-type giant in the constellation Camelopardalis
HD 25274
Location of HD 25274 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  04h 06m 03.18286s[1]
Declination +68° 40′ 47.8990″[1]
Apparent magnitude (V) 5.86±0.01[2]
Characteristics
Spectral type M0 III[3]
B−V color index +1.54[4]
Astrometry
Radial velocity (Rv)−48.23±0.26[5] km/s
Proper motion (μ) RA: +7.555[1] mas/yr
Dec.: +2.938[1] mas/yr
Parallax (π)5.4653 ± 0.0455[1] mas
Distance597 ± 5 ly
(183 ± 2 pc)
Absolute magnitude (MV)−0.51[6]
Details
Radius59.8+1.6−1.5[7] or 39.6+1.2−5.9[1] R☉
Luminosity762+26−22[1] L☉
Surface gravity (log g)1.22[8] cgs
Temperature3,985±122[9] K
Metallicity [Fe/H]−0.21±0.09[10] dex
Rotational velocity (v sin i)2.2±1.2[11] km/s
Other designations
BD+68°303, FK5 2291, GC 4874, HD 25274, HIP 19129, HR 1241, SAO 13006[12]
Database references
SIMBADdata

HD 25274, also known as HR 1241, is a solitary star[13] located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a red hued point of light with an apparent magnitude of 5.86.[2] Gaia DR3 parallax measurements imply a distance of 597 light-years and it is currently drifting closer with a heliocentric radial velocity of −48.23 km/s.[5] At its current distance, HD 25274's brightness is diminished by three-tenths of a magnitude due to interstellar extinction[14] and it has an absolute magnitude of −0.51.[6]

HD 25274 has a stellar classification of M0 III,[3] indicating that it is an evolved red giant. However, the Bright Star Catalog gives a hotter classification of K2 III.[15] The spectrophotometry-measured angular diameter, after correcting for limb darkening, is 2.02±0.03 mas.[16] At the estimated distance for HD 25274, this yields a physical radius 39.8 times that of the Sun.[17] It also has an empirical radius of 48.1 R☉[7] and Gaia DR3 models a larger radius.[1] The object radiates 762 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 3,985 K.[9] HD 25274 is metal deficient with an iron abundance 62% that of the Sun's ([Fe/H] = −0.21)[10] and it spins modestly with a projected rotational velocity of 2.2 km/s.[11] HD 25274 is a field star of the HIP 21974 cluster.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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 Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars.". The Astrophysical Journal 111: 221. doi:10.1086/145261. ISSN 0004-637X. Bibcode: 1950ApJ...111..221W. 
  4. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H. 
  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 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 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  9. ↑ 9.0 9.1 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. 
  10. ↑ 10.0 10.1 Taylor, B. J. (February 1999). "Catalogs of temperatures and [Fe/H] averages for evolved G and K stars". Astronomy and Astrophysics Supplement 134 (3): 523–524. doi:10.1051/aas:1999153. Bibcode: 1999A&AS..134..523T. 
  11. ↑ 11.0 11.1 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series 139 (3): 433–460. doi:10.1051/aas:1999401. ISSN 0365-0138. Bibcode: 1999A&AS..139..433D. 
  12. ↑ "HD 25274". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+25274. 
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode: 1991bsc..book.....H. 
  16. ↑ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005). "CHARM2: An updated Catalog of High Angular Resolution Measurements". Astronomy & Astrophysics 431 (2): 773–777. doi:10.1051/0004-6361:20042039. ISSN 0004-6361. Bibcode: 2005A&A...431..773R. 
  17. ↑ Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. 1 (3rd ed.). Birkhäuser. ISBN 3-540-29692-1. https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41.  The radius (R*) is given by:
    2⋅R*=(10−3⋅183⋅2.02) AU0.0046491 AU/R⨀≈79.51⋅R⨀
  18. ↑ Cantat-Gaudin, T.; Jordi, C.; Vallenari, A.; Bragaglia, A.; Balaguer-Núñez, L.; Soubiran, C.; Bossini, D.; Moitinho, A. et al. (October 2018). "A Gaia DR2 view of the open cluster population in the Milky Way". Astronomy & Astrophysics 618: A93. doi:10.1051/0004-6361/201833476. ISSN 0004-6361. Bibcode: 2018A&A...618A..93C. 



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