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Star in the constellation Centaurus
This article is about n Centauri. Not to be confused with
N Centauri .
HD 111968 , also known by the
Bayer designation n Centauri , is a single
[8]
star in the southern
constellation of
Centaurus . It is a white-hued star that is faintly visible to the naked eye with an
apparent visual magnitude of +4.25.
[2] The star is located at a distance of approximately 149
light years from the
Sun based on
parallax .
[1] The
radial velocity of the star is poorly constrained, with an estimated value of 2.5 km/s.
[2]
This is classified as an
A-type star but there has been disagreement about the
luminosity class .
A. de Vaucouleurs in 1957 found a class of III, suggesting this is an evolved
giant star .
[9]
O. J. Eggen gave a class of V in 1962,
[10] as did
R. O. Gray and
R. F. Garrison in 1989,
[4] indicating this is a
main sequence star. In 1979,
N. Houk found a class of IV,
[3] meaning this is a
subgiant star .
HD 111968 is a young star, some 400 million years old, with 1.6 times the mass of the Sun.
[6] It is spinning with a
projected rotational velocity of 92 km/s.
[5] The star is radiating 34
[2] times the luminosity of the Sun from its
photosphere at an
effective temperature of 7,835 K.
[6]
References
^
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 .
Vizier catalog entry
^
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 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan,
Bibcode :
1982mcts.book.....H .
^
a
b Gray, R. O.; Garrison, R. F. (1989), "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", The Astrophysical Journal Supplement Series , 70 : 623,
Bibcode :
1989ApJS...70..623G ,
doi :
10.1086/191349 .
^
a
b
c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics , 542 : A116,
arXiv :
1204.2459 ,
Bibcode :
2012A&A...542A.116A ,
doi :
10.1051/0004-6361/201118724 ,
S2CID
53666672 .
^
a
b
c
d
e
f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal , 804 (2): 146,
arXiv :
1501.03154 ,
Bibcode :
2015ApJ...804..146D ,
doi :
10.1088/0004-637X/804/2/146 ,
S2CID
33401607 .
^
"n Cen" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2021-10-01 .
^ 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 .
^ de Vaucouleurs, A. (1957).
"Spectral types and luminosities of B, A and F southern stars" . Monthly Notices of the Royal Astronomical Society . 117 (4): 449.
Bibcode :
1957MNRAS.117..449D .
doi :
10.1093/mnras/117.4.449 .
^ Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin , 51 ,
Bibcode :
1962RGOB...51...79E .