RR Ursae Minoris visades av J. Ashbrook (1946) vara en variabel stjärna,[14] och är katalogiserad som en halvregelbunden variabel av undertyp SRb[6] som varierar från magnituden 4,44 till 4,85 med en period av 43,3 dygn.[3] Variationer i perioden har dock observerats i en tidsskala av 30–60 dygn.[15]
Referenser
Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, RR Ursae Majoris, [MACS J1149 Lensed Star 1 - Wikipedia 19 november 2022].
Noter
^ [abcdefghi] 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.
^ [abc] Otero, Sebastian Alberto (16 November 2009). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Hämtad 18 maj 2014.
^ [ab] Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
^ [abc] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
^de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. S2CID 59451347. A61.
^ [ab] Halabi, Ghina M.; Eid, Mounib El (2015). "Exploring masses and CNO surface abundances of red giant stars". Monthly Notices of the Royal Astronomical Society. 451 (3): 2957. arXiv:1507.01517. Bibcode:2015MNRAS.451.2957H. doi:10.1093/mnras/stv1141. S2CID 118707332.
^"RR UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 7 september 2018.
^ [ab] Ortiz, Roberto; Guerrero, Martín A. (2016). "Ultraviolet emission from main-sequence companions of AGB stars". Monthly Notices of the Royal Astronomical Society. 461 (3): 3036. arXiv:1606.09086. Bibcode:2016MNRAS.461.3036O. doi:10.1093/mnras/stw1547. S2CID 118619933.
^Batten, A. H.; Fletcher, J. M. (July 1986). "A revised spectroscopic orbit for RR Ursae Minoris". Publications of the Astronomical Society of the Pacific. 98: 647–650. Bibcode:1986PASP...98..647B. doi:10.1086/131808.
^"Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Hämtad 8 december 2021.
^Dettmar, R. -J.; Gieseking, F. (December 1983). "The intrinsically variable spectroscopic binary RR UMi". Astronomy and Astrophysics, Supplemental Series. 54: 541–543. Bibcode:1983A&AS...54..541D.
^Lloyd, C.; West, K. W. (May 1996). "Observations of Low-amplitude Late-Type Variables". Information Bulletin on Variable Stars. 4335: 1. Bibcode:1996IBVS.4335....1L.