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Star in the constellation Cancer
38 Cancri is a
variable star in the
zodiac
constellation
Cancer , located around 607
light years from the Sun. This object has the
variable star designation BT Cancri ; 38 Cancri is the
Flamsteed designation . It is a member of the
Praesepe cluster
[10] but is a challenge to view with the naked eye, having an
apparent visual magnitude of 6.65.
[3] The star is moving closer to the Earth with a heliocentric
radial velocity of +32 km/s.
[6]
This is an
evolving
subgiant star with a
stellar classification of F0 IV.
[4] It was found to be a pulsating variable by Michel Breger in 1970
[11] and is classed as a
Delta Scuti variable . The star displays a pattern of variation showing up to 22 different
frequencies , with three being dominant.
[12] The brightness varies by up to 0.07 in magnitude.
[5] The star has a
magnetic field with a computed longitudinal field strength of −215± 149
G .
[8] It has 1.8
[7] times the
mass of the Sun and 1.8
[7] times the
Sun's radius . The star is radiating 59
[3] times the
Sun's luminosity from its
photosphere at an
effective temperature of around 7,300 K.
[8]
References
^ Gupta, S. K. (September 1979).
"Light Variation of the Delta Scuti Star 38 CNC" . Bulletin of the Astronomical Society of India . 7 : 72–77.
Bibcode :
1979BASI....7...72G . Retrieved 11 November 2021 .
^
a
b
c
d
e
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
c
d
e
f 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 .
^
a
b Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal , 121 (4): 2148–2158,
Bibcode :
2001AJ....121.2148G ,
doi :
10.1086/319956 .
^
a
b Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports , 5.1, 61 (1): 80–88,
Bibcode :
2017ARep...61...80S ,
doi :
10.1134/S1063772917010085 ,
S2CID
125853869 .
^
a
b 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.
^
a
b
c
d
e
f van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal , 776 (2): 20,
arXiv :
1306.3701 ,
Bibcode :
2013ApJ...776...67V ,
doi :
10.1088/0004-637X/776/2/67 ,
S2CID
119097746 , 67.
^
a
b
c
d
e Fossati, L.; et al. (December 2007), "Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster", Astronomy and Astrophysics , 476 (2): 911–925,
arXiv :
0710.0579 ,
Bibcode :
2007A&A...476..911F ,
doi :
10.1051/0004-6361:20078320 ,
S2CID
16152096 .
^
"38 Cnc" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-03-01 .
^ Michel, E.; et al. (February 1999), "Seismology of delta Scuti stars in the Praesepe cluster. I. Ranges of unstable modes as predicted by linear analysis versus observations", Astronomy and Astrophysics , 342 : 153–166,
Bibcode :
1999A&A...342..153M .
^ Breger, Michel (November 1970), "Metallic-Line a Stars and Pulsation", Astrophysical Journal , 162 : 597,
Bibcode :
1970ApJ...162..597B ,
doi :
10.1086/150691
^ Breger, M.; et al. (February 2012), "Delta Scuti stars in the Praesepe cluster observed by the MOST satellite", Astronomische Nachrichten , 333 (2): 131,
arXiv :
1201.0892 ,
Bibcode :
2012AN....333..131B ,
doi :
10.1002/asna.201111640 ,
S2CID
118458884 .