White-hued star in the constellation Andromeda
HD 220105 is astar in the northernconstellation ofAndromeda , and a member of theSirius supercluster .[ 9] apparent visual magnitude of 6.24, and can be a challenge to spot under normal viewing conditions. The star is located 238 light years away, based upon an annualparallax shift ofmas radial velocity of −2 km/s.
This is anA-type main-sequence star with astellar classification of A5 Vn, where the 'n' notation indicates "nebulous"absorption lines due to rapid rotation. It is around 525 million years old with a highprojected rotational velocity of 259 km/s. The star has 1.85 times themass of the Sun and is radiating 19 times theSun's luminosity from itsphotosphere at aneffective temperature of 8,367 K.
HD 220105 has a magnitude 10.13 companion located at anangular separation of″ position angle of 178°, as of 2015,[ 10] close binary by Zorec and Royer (2012).[ 4] X-ray emission with a luminosity of× 1022 W [ 11]
^a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters 38 (5): 331.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 . XHIP record for this object atVizieR .^a b c d e f g h 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 atVizieR .^a b c Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI".Astronomy and Astrophysics Supplement Series .89 (2):415– 419.Bibcode :1991A&AS...89..415O . ^a b c Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities",Astronomy & Astrophysics ,537 : A120,arXiv :1201.2052 Bibcode :2012A&A...537A.120Z ,doi :10.1051/0004-6361/201117691 ,S2CID 55586789 . ^ Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications".Astronomical Journal .74 :375– 406.Bibcode :1969AJ.....74..375C .doi :10.1086/110819 . ^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations".Astronomische Nachrichten .328 (9): 889.arXiv :0705.0878 Bibcode :2007AN....328..889K .doi :10.1002/asna.200710776 .S2CID 119323941 . ^a b c d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets",The Astrophysical Journal ,804 (2): 146,arXiv :1501.03154 Bibcode :2015ApJ...804..146D ,doi :10.1088/0004-637X/804/2/146 ,S2CID 33401607 . ^ "HD 220105" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedOctober 16, 2018 .^ Palous, J.; Hauck, B. (July 1986), "The Sirius supercluster",Astronomy and Astrophysics ,162 :54– 61,Bibcode :1986A&A...162...54P ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog",The Astronomical Journal ,122 (6): 3466,Bibcode :2001AJ....122.3466M ,doi :10.1086/323920 ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars",Astronomy and Astrophysics ,475 (2):677– 684,Bibcode :2007A&A...475..677S ,doi :10.1051/0004-6361:20077429
