HD 27022
Star in the constellation Camelopardalis
HD 27022 , also known as HR 1327 , is a star located in the northern circumpolar constellation Camelopardalis . The object has also been designated as 20 H. Camelopardalis , but is not commonly used in modern times. It has an apparent magnitude of 5.27,[ 2] allowing it to be faintly visible to the naked eye . Based on parallax measurements from Gaia DR3 , the star has been estimated to be 347 light years away.[ 1] It appears to be approaching the Solar System , having a heliocentric radial velocity of −19.5 km/s .[ 5]
This is a solitary,[ 15] yellow giant with a stellar classification of G4 III.[ 3] It has alternatively been classified as G5 IIb wk,[ 4] indicating a bright giant with weak lines. HD 27022 is currently on the horizontal branch located on the warm end of the red clump ,[ 16] a region of the said branch filled with metal-rich giant stars. It has 2.88 times the mass of the Sun but at the age of 444 million years ,[ 7] it has expanded to 10.71 times its girth .[ 8] It radiates 75.9 times the luminosity of the Sun [ 9] from its enlarged photosphere at an effective temperature of 5,425 K .[ 11] Like most giants, it spins rather slowly, having a projected rotational velocity of 1 ⁄2 km/s .[ 12] Kinematically, it belongs to the halo of the Ursa Major moving group .[ 17]
References
^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 . Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 . S2CID 244398875 .
Gaia DR3 record for this source at VizieR .
^ a b c d 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 .
^ a b Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars" . The Astrophysical Journal Supplement Series . 71 : 245. Bibcode :1989ApJS...71..245K . doi :10.1086/191373 . ISSN 0067-0049 .
^ a b Keenan, P. C.; Pitts, R. E. (April 1980). "Revised MK spectral types for G, K ANS M stars" . The Astrophysical Journal Supplement Series . 42 : 541–563. Bibcode :1980ApJS...42..541K . doi :10.1086/190662 . ISSN 0067-0049 .
^ a b Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (9 January 2008). "Vertical distribution of Galactic disk stars" . Astronomy & Astrophysics . 480 (1): 91–101. arXiv :0712.1370 . Bibcode :2008A&A...480...91S . doi :10.1051/0004-6361:20078788 . eISSN 1432-0746 . ISSN 0004-6361 .
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346. arXiv :1108.4971 . Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119257644 .
^ a b c Feltzing, S.; Holmberg, J.; Hurley, J. R. (October 2001). "The solar neighbourhood age-metallicity relation - Does it exist?" . Astronomy & Astrophysics . 377 (3): 911–924. arXiv :astro-ph/0108191 . Bibcode :2001A&A...377..911F . doi :10.1051/0004-6361:20011119 . eISSN 1432-0746 . ISSN 0004-6361 .
^ a b Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics . 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR .
^ a b Luck, R. Earle (September 2015). "Abundances in the Local Region. I. G and K Giants" . The Astronomical Journal . 150 (3): 88. arXiv :1507.01466 . Bibcode :2015AJ....150...88L . doi :10.1088/0004-6256/150/3/88 . ISSN 0004-6256 .
^ a b da Silva, Ronaldo; Milone, André de C.; Rocha-Pinto, Helio J. (August 2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets" . Astronomy and Astrophysics . 580 : A24. arXiv :1505.01726 . Bibcode :2015A&A...580A..24D . doi :10.1051/0004-6361/201525770 . ISSN 0004-6361 .
^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138. arXiv :1905.10694 . Bibcode :2019AJ....158..138S . doi :10.3847/1538-3881/ab3467 . eISSN 1538-3881 .
^ a b Gray, David F.; Toner, C. G. (November 1986). "Rotation and macroturbulence in bright giants" . The Astrophysical Journal . 310 : 277. Bibcode :1986ApJ...310..277G . doi :10.1086/164681 . eISSN 1538-4357 . ISSN 0004-637X .
^ Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius" . Astronomy and Astrophysics . 516 : A29. Bibcode :2010A&A...516A..29V . doi :10.1051/0004-6361/201014003 . eISSN 1432-0746 . ISSN 0004-6361 .
^ "HD 27022" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 22 September 2022 .
^ 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. arXiv :0806.2878 . Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x . eISSN 1365-2966 . ISSN 0035-8711 .
^ Alves, David R. (20 August 2000). "K ‐Band Calibration of the Red Clump Luminosity" . The Astrophysical Journal . 539 (2): 732–741. arXiv :astro-ph/0003329 . Bibcode :2000ApJ...539..732A . doi :10.1086/309278 . eISSN 1538-4357 . ISSN 0004-637X .
^ Chupina, N. V.; Reva, V. G.; Vereshchagin, S. V. (4 May 2006). "Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars" . Astronomy & Astrophysics . 451 (3): 909–916. Bibcode :2006A&A...451..909C . doi :10.1051/0004-6361:20054009 . eISSN 1432-0746 . ISSN 0004-6361 .