From Wikipedia, the free encyclopedia
Star in the constellation Sagittarius
Xi1 Sagittarii (ξ1 Sagittarii ) is a solitary,
[11] blue-white hued
star in the
zodiac
constellation of
Sagittarius . It is visible to the naked eye with an
apparent visual magnitude of +5.06.
[2] Based upon a small annual
parallax shift of 1.58
mas as seen from Earth,
[1] this system is located roughly 2,100
light years from the
Sun .
This is a massive
supergiant star
[6] with a
stellar classification of B9/A0 Ib.
[3] With an estimated 7.8
[5] times the
mass of the Sun and an age of about 40
[5] million years it has depleted the hydrogen at its core, causing it to expand to about 15 times the
Sun's radius .
[6] It is radiating 2,753
[7] times the
Sun's luminosity from its
photosphere at an
effective temperature of about 9,400 K.
[8]
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 .
^
a
b
c
d Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series , 52 : 7,
Bibcode :
1983ApJS...52....7F ,
doi :
10.1086/190856 .
^
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 .
^ 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
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 Venn, Kim A. (August 1995), "Atmospheric Parameters and LTE Abundances for 22 Galactic, A-Type Supergiants", Astrophysical Journal Supplement , 99 : 659,
Bibcode :
1995ApJS...99..659V ,
doi :
10.1086/192201 .
^
a
b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–57,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^
a
b
c
d Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics , 515 : A111,
arXiv :
1004.1069 ,
Bibcode :
2010A&A...515A.111S ,
doi :
10.1051/0004-6361/201014247 ,
S2CID
118362423 .
^ Royer, F.; et al. (January 2012), "Rotational velocities of A-type stars. I. Measurement of v sin i in the southern hemisphere", Astronomy and Astrophysics , 381 : 105–121,
arXiv :
astro-ph/0110490 ,
Bibcode :
2002A&A...381..105R ,
doi :
10.1051/0004-6361:20011422 ,
S2CID
13133418 .
^
"ksi01 Sgr" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2017-07-05 .
^ 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 .