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Star in the constellation Cetus
7 Ceti is a single,
[10]
variable star in the
equatorial
constellation of
Cetus . It has the
variable star designation AE Ceti.
[1] The star is visible to the naked eye with a baseline
apparent visual magnitude of 4.44.
[3] Based upon an annual
parallax shift of only 7.3 mas ,
[2] it is located roughly 450
light years away. It is moving closer to the Sun with a heliocentric
radial velocity of −23 km/s.
[6] Eggen (1965) listed it as a probable member of the
Wolf 630 group of co-moving stars.
[11]
This is an aging
red giant star with a
stellar classification of M1 III,
[5] currently on the
asymptotic giant branch .
[12] Samus et al. (2017) has it classed as a
slow irregular variable of type LB:, and ranges in magnitude from 4.26 down to 4.46.
[4] Tabur et al. (2009) list it as a
semiregular variable with four known periods ranging in
frequency from 19.2 to 41.7 days.
[1] The
stellar atmosphere of 7 Ceti has expanded to an estimated 54
[7] times the
Sun's radius . It is radiating around 1,019
[8] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 3,800 K.
[8]
Luminosity variation
[1]
Period (Days)
Amplitude (Mag.)
19.2
0.018
19.6
0.020
27.1
0.018
41.7
0.017
References
^
a
b
c
d Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants",
Monthly Notices of the Royal Astronomical Society , 400 (4): 1945–1961,
arXiv :
0908.3228 ,
Bibcode :
2009MNRAS.400.1945T ,
doi :
10.1111/j.1365-2966.2009.15588.x ,
S2CID
15358380 .
^
a
b
c
d
e
f 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 .
^
a
b
c
d 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
c 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 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,
Bibcode :
1988mcts.book.....H .
^
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 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (2) (Third ed.): 521–524,
arXiv :
astro-ph/0012289 ,
Bibcode :
2001A&A...367..521P ,
doi :
10.1051/0004-6361:20000451 ,
S2CID
425754 .
^
a
b
c
d McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^
"7 Cet" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved December 26, 2018 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869–879,
arXiv :
0806.2878 ,
Bibcode :
2008MNRAS.389..869E ,
doi :
10.1111/j.1365-2966.2008.13596.x ,
S2CID
14878976 .
^ Eggen, O. J. (October 1965), "The Wolf 630 group", The Observatory , 85 : 191–195,
Bibcode :
1965Obs....85..191E ,
^ Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal , 104 : 275,
Bibcode :
1992AJ....104..275E ,
doi :
10.1086/116239 .