Gliese 22, also cataloguedV547 Cassiopeiae orADS 440, is a hierarchicalstar system approximately 33light-years away in theconstellation ofCassiopeia. The system consists of pair ofred dwarfstars, Gliese 22A and Gliese 22C, orbited by a third red dwarf Gliese 22B in an outer orbit of about 223 years.
The discovery offlare activity on Gliese 22A was announced by Bjørn Ragnvald Pettersen in 1975,[1] which led to it being given avariable star designation, V547 Cassiopeiae, in 1977.[11]
As of 2008, it was announced that a possibleextrasolar planet, Gliese 22B b, orbits Gliese 22B but this is currently unconfirmed. The study in 2011 has indicated the orbit of the purported planet is stable.[12]
^McCarthy, D. W.; Henry, Todd J.; McLeod, Brian; Christou, Julian C. (1991). "The Low-Mass Companion of Gliese 22A: First Results of the Steward Infrared Speckle Camera".The Astronomical Journal.101: 214.Bibcode:1991AJ....101..214M.doi:10.1086/115681.
^Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (2019), "How to constrain your M dwarf. II. The Mass-Luminosity-Metallicity relation from 0.075 to 0.70 solar masses",The Astrophysical Journal,871 (1): 63,arXiv:1811.06938,Bibcode:2019ApJ...871...63M,doi:10.3847/1538-4357/aaf3bc,S2CID119372932
^Jeffers, S. V.; Schöfer, P.; Lamert, A.; Reiners, A.; Montes, D.; Caballero, J. A.; Cortés-Contreras, M.; Marvin, C. J.; Passegger, V. M.; Zechmeister, M.; Quirrenbach, A.; Alonso-Floriano, F. J.; Amado, P. J.; Bauer, F. F.; Casal, E.; Diez Alonso, E.; Herrero, E.; Morales, J. C.; Mundt, R.; Ribas, I.; Sarmiento, L. F. (2018). "CARMENES input catalogue of M dwarfs. III. Rotation and activity from high-resolution spectroscopic observations".Astronomy and Astrophysics.614: A76.arXiv:1802.02102.Bibcode:2018A&A...614A..76J.doi:10.1051/0004-6361/201629599.S2CID56147445.
^Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977)."62nd Name-List of Variable Stars".Information Bulletin on Variable Stars.1248 (1248): 1.Bibcode:1977IBVS.1248....1K. Retrieved28 August 2024.
