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Star in the constellation Sagitta
Beta Sagittae ,
Latinized from β Sagittae, is a single
[13]
star in the northern
constellation of
Sagitta . It is a faint star but visible to the naked eye with an
apparent visual magnitude of 4.38.
[2] Based upon an annual
parallax shift of 7.7237
mas as seen from the Gaia satellite, it is located 420
light years from the
Sun . The star is moving closer to the Sun with a
radial velocity of −22 km/s.
[5]
This is an
evolved
red giant
[11] with a
stellar classification of G8 IIIa CN 0.5 .
[3] The suffix notation indicates a mild overabundance of the
cyanogen molecule in the
spectrum . Beta Sagittae is an estimated 129 million years old with 4.33 times the
mass of the Sun ,
[8] and has expanded to roughly 27 times the
Sun's radius .
[9] The star is radiating 392
[10] times the
Sun's luminosity from its enlarged
photosphere at an
effective temperature of 4,850 K.
[7]
Naming
In
Chinese , 左旗 (Zuǒ Qí ), meaning
Left Flag , refers to an asterism consisting of β Sagittae,
α Sagittae ,
δ Sagittae ,
ζ Sagittae ,
γ Sagittae ,
13 Sagittae ,
11 Sagittae ,
14 Sagittae and
ρ Aquilae . Consequently, the
Chinese name for β Sagittae itself is 左旗二 (Zuǒ Qí èr , English: the Second Star of Left Flag .)
[14]
References
^
a
b 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 Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series , 52 : 7–22,
Bibcode :
1983ApJS...52....7F ,
doi :
10.1086/190856 .
^
a
b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 : 245,
Bibcode :
1989ApJS...71..245K ,
doi :
10.1086/191373 .
^
a
b
c Hoffleit, D.; Warren, Jr., W. H., The Bright Star Catalogue (5th Revised Ed. (Preliminary Version) ed.),
CDS .
HR 7488 , database entry
^
a
b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters , 32 (11): 759–771,
arXiv :
1606.08053 ,
Bibcode :
2006AstL...32..759G ,
doi :
10.1134/S1063773706110065 ,
S2CID
119231169 .
^
a
b
c
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 Carney, Bruce W.; et al. (March 2008), "Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars", The Astronomical Journal , 135 (3): 892–906,
arXiv :
0711.4984 ,
Bibcode :
2008AJ....135..892C ,
doi :
10.1088/0004-6256/135/3/892 ,
S2CID
2756572 .
^
a
b Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal , 785 (2): 12,
arXiv :
1404.1687 ,
Bibcode :
2014ApJ...785...94L ,
doi :
10.1088/0004-637X/785/2/94 ,
S2CID
119226316 , 94.
^
a
b Van Belle, G. T.; et al. (2009), "Supergiant temperatures and linear radii from near-infrared interferometry", Monthly Notices of the Royal Astronomical Society , 394 (4): 1925,
arXiv :
0811.4239 ,
Bibcode :
2009MNRAS.394.1925V ,
doi :
10.1111/j.1365-2966.2008.14146.x ,
S2CID
118372600 .
^
a
b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357,
arXiv :
1208.2037 ,
Bibcode :
2012MNRAS.427..343M ,
doi :
10.1111/j.1365-2966.2012.21873.x ,
S2CID
118665352 .
^
a
b Takeda, Yoichi; Tajitsu, Akito (2014), "Spectroscopic study on the beryllium abundances of red giant stars", Publications of the Astronomical Society of Japan , 66 (5): 91,
arXiv :
1406.7066 ,
Bibcode :
2014PASJ...66...91T ,
doi :
10.1093/pasj/psu066 .
^
"bet Sge" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2017-11-26 . {{
cite web }}
: CS1 maint: postscript (
link )
^ 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 .
^ (in Chinese)
AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日