Red giant star in the constellation Cancer
Mu1 Cancri ,Latinised from μ1 Cancri, is avariable star in thezodiac constellation ofCancer . The name Mu1 comes from theBayer naming system : the "1" in the name is because (fromEarth ) it appears to be close to 10 Cancri, orMu2 Cancri . It is also known by thevariable star designation BL Cancri . The star is dimly visible to thenaked eye with anapparent visual magnitude that ranges from 5.87 down to 6.07.[ 4] Parallax measurements put it about 630light-years (192parsecs ) from theSun .[ 10] extinction factor of 0.28.[ 11] ecliptic means it is subject tolunar occultations .[ 12]
In 1967,Olin J. Eggen announced his discovery that Mu1 Cancri is a variable star.[ 13] [ 14] slow irregular variable [ 6] [ 1] radius of the Sun and it is radiating 565 times theSun's luminosity from its enlargedphotosphere at aneffective temperature ofK [ 2]
The star Mu1 Cancri is anevolved red giant currently on theasymptotic giant branch [ 5] stellar classification of M3 III.[ 6] technetium-99 in thespectrum indicates it has not yet gone through thirddredge-up .[ 15]
^a b Tabur, V.;Bedding, T. R. (2009), "Long-term photometry and periods for 261 nearby pulsating M giants",Monthly Notices of the Royal Astronomical Society 400 (4):1945– 61,arXiv :0908.3228 Bibcode :2009MNRAS.400.1945T ,doi :10.1111/j.1365-2966.2009.15588.x S2CID 15358380 . ^a b c d e f g h i 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 atVizieR .^a b Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system",CDS/ADC Collection of Electronic Catalogues ,2237 ,Bibcode :2002yCat.2237....0D . ^a b 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 . ^a b Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun",Astronomical Journal ,104 (1):275– 313,Bibcode :1992AJ....104..275E ,doi :10.1086/116239 . ^a b c d Lebzelter, T.; Hron, J. (December 2003), "Technetium and the third dredge up in AGB stars. I. Field stars",Astronomy and Astrophysics ,411 (3):5335– 42,arXiv :astro-ph/0310018 Bibcode :2003A&A...411..533L ,doi :10.1051/0004-6361:20031458 ,S2CID 18879265 . ^ 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. ^ 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 ,S2CID 119257644 . ^ "mu.01 Cnc" ,SIMBAD Centre de données astronomiques de Strasbourg , retrieved2017-06-17 .^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics ,474 (2):653– 664,arXiv :0708.1752 Bibcode :2007A&A...474..653V ,doi :10.1051/0004-6361:20078357 ,S2CID 18759600 . ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters",Astronomy and Astrophysics ,430 (1):165– 186,arXiv :astro-ph/0409579 Bibcode :2005A&A...430..165F ,doi :10.1051/0004-6361:20041272 ,S2CID 17804304 . ^ Schneider, Glenn; Anderson, Chris (April 1993), "Rosemary Hill Observatory Lunar Occultation Summary for 1983-1984",Publications of the Astronomical Society of the Pacific ,105 : 367,Bibcode :1993PASP..105..367S ,doi :10.1086/133163 ,S2CID 123581239 . ^ Eggen, O. J. (September 1967)."Narrow and broad band photometry of red stars : I. Northern giants" .Astrophysical Journal, Suppl. Ser .14 :307– 358.Bibcode :1967ApJS...14..307E .doi :10.1086/190158 . Retrieved31 December 2024 . ^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972)."58th Name-List of Variable Stars" (PDF) .Information Bulletin on Variable Stars .717 :1– 36.Bibcode :1972IBVS..717....1K . Retrieved31 December 2024 . ^ Lebzelter, T.; Hron, J. (December 2003), "Technetium and the third dredge up in AGB stars. I. Field stars",Astronomy and Astrophysics ,411 (3):533– 542,arXiv :astro-ph/0310018 Bibcode :2003A&A...411..533L ,doi :10.1051/0004-6361:20031458 ,S2CID 18879265 .
