Astronomy:HD 25274

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Short description: M-type giant in the constellation Camelopardalis
HD 25274
Camelopardalis constellation map.svg
Red circle.svg
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:
    [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(10^{-3}\cdot 183\cdot 2.02)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 79.51\cdot R_{\bigodot} \end{align} }[/math]
  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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