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Star in the constellation Scorpius
This article is about b Scorpii. Not to be confused with
β Scorpii .
1 Scorpii , or b Scorpii , is a single
[9]
star in the southern
zodiac
constellation of
Scorpius . It has an
apparent magnitude of 4.63,
[2] which is bright enough to be faintly visible to the naked eye on a dark night. The star shows an annual
parallax shift of 6.59
mas from Earth's orbit, which equates to a distance of roughly 490
light years . It is a probable (89% chance) member of the
Sco OB2
moving group .
[10]
[9]
This is a
B-type main-sequence star with a
stellar classification of B1.5 Vn,
[3] where the 'n' suffix indicates "nebulous"
absorption lines being induced by rapid rotation. It has a
projected rotational velocity of 310 km/s, which is giving the star an
oblate shape with an
equatorial bulge that is 13% wider than the polar radius.
[7] There is some weak evidence that this is a
Be star with a gaseous disk that is being viewed edge-on.
[11]
1 Scorpii is a young star at around 10
[5] million years old, with 8.3
[5] times the
mass of the Sun and 3.7 times the
Sun's radius .
[6] The star is radiating 3,890 times the
Sun's luminosity from its
photosphere at an
effective temperature of about 24,000 K.
[6]
References
^
a
b
c
d
e 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 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 .
^ 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 Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",
Monthly Notices of the Royal Astronomical Society , 410 (1): 190–200,
arXiv :
1007.4883 ,
Bibcode :
2011MNRAS.410..190T ,
doi :
10.1111/j.1365-2966.2010.17434.x ,
S2CID
118629873 .
^
a
b
c
d
e Hernández, J. S.; et al. (2005), "Herbig Ae/Be Stars in nearby OB Associations", The Astronomical Journal , 129 (2): 856,
arXiv :
astro-ph/0410494 ,
Bibcode :
2005AJ....129..856H ,
doi :
10.1086/426918 ,
S2CID
17672346 .
^
a
b Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review , 20 (1): 51,
arXiv :
1204.2572 ,
Bibcode :
2012A&ARv..20...51V ,
doi :
10.1007/s00159-012-0051-2 ,
S2CID
119273474 .
^
"b Sco" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2018-02-21 .
^
a
b 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 .
^ Rizzuto, Aaron; et al. (October 2011), "Multidimensional Bayesian membership analysis of the Sco OB2 moving group", Monthly Notices of the Royal Astronomical Society , 416 (4): 3108–3117,
arXiv :
1106.2857 ,
Bibcode :
2011MNRAS.416.3108R ,
doi :
10.1111/j.1365-2966.2011.19256.x ,
S2CID
54510608 .
^ Rivinius, Th.; et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics , 459 (1): 137−145,
Bibcode :
2006A&A...459..137R ,
doi :
10.1051/0004-6361:20053008 .