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Red giant star in the constellation Cancer
Mu1 Cancri ,
Latinised from μ1 Cancri, is a
variable star in the
zodiac
constellation of
Cancer . The name Mu1 comes from the
Bayer naming system : the "1" in the name is because (from
Earth ) it appears to be close to 10 Cancri, or
Mu2 Cancri . It is also known by the
variable star designation BL Cancri . The star is dimly visible to the naked eye with an
apparent visual magnitude that ranges from 5.87 down to 6.07.
[4]
Parallax measurements put it about 630
light-years (192
parsecs ) from the
Sun .
[10] At that distance, the visual magnitude is diminished by an
extinction factor of 0.28.
[11] The position of the star near the
ecliptic means it is subject to
lunar occultations .
[12]
The star Mu1 Cancri is an
evolved
red giant currently on the
asymptotic giant branch
[5] with a
stellar classification of M3 III.
[6] The lack of
technetium-99 in the
spectrum indicates it has not yet gone through third
dredge-up .
[13] It is a
slow irregular variable
[6] with thermal pulsation periods of 22.6, 37.8 and 203.7 days.
[1] The star has expanded to 57 times the
radius of the Sun and it is radiating 565 times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 3,774
K .
[2]
References
^
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 at
VizieR .
^
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 , retrieved 2017-06-17 .
^ 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 .
^ 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 . See CncBL in Table 2.