Beta Sagittae
{{Short description|Star in the constellation Sagitta}}
{{Starbox begin
| name = β Sagittae
}}
{{Starbox image
| image=
{{Location mark
|image=Sagitta constellation map.svg|alt=|float=center|width=250
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=β Sagittae
|x=448|y=298
}}
|caption=Location of β Sagittae (circled)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Sagitta
| dec = {{DEC|+17|28|33.7528}}
}}
{{Starbox character
| class = {{nowrap|G8 IIIa CN 0.5}}
}}
{{Starbox astrometry
| radial_v = {{Val|−22.0|0.3}}
| prop_mo_dec = −32.987 ± 0.279
| parallax = 7.7237
| p_error = 0.1941
| parallax_footnote = {{cite DR2|1823991938300446336}}
| absmag_v={{val|-1.39|+0.22|-0.20}}
}}
{{Starbox detail
| mass = {{val|3.755|0.050}}
| radius = {{Val|25.7|0.4}}
| luminosity = {{val|369|11}}
| gravity = {{val|2.20|0.02}}
| metal_fe = {{val|+0.00|0.03}}
| temperature = {{val|4990|20|fmt=commas}}
| rotational_velocity = {{val|9.1|0.7}}
}}
{{Starbox catalog
| names= {{odlist | B=β Sge | F=6 Sagittae | BD=+17°4048 | FK5=1513 | HD=185958 | HIP=96837 | HR=7488 | SAO=105133 | GC=27236 | PPM=136766 }}
}}
{{Starbox reference
| Simbad=beta+sagittae
}}
{{Starbox end}}
Beta Sagittae, Latinized from β Sagittae, is a single 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. 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.
This is an evolved red giant with a stellar classification of {{nowrap|G8 IIIa CN 0.5}}. The suffix notation indicates a mild overabundance of the cyanogen molecule in the spectrum. Beta Sagittae is an estimated 129 million years old with 3.755 times the mass of the Sun, and has expanded to 25.7 times the Sun's radius. The star is radiating 369 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,990 K.
Naming
In Chinese, {{lang|zh|左旗}} ({{lang|zh-Latn|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 {{lang|zh|左旗二}} ({{lang|zh-Latn|Zuǒ Qí èr}}, {{langx|en|the Second Star of Left Flag}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060703.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日] {{Webarchive|url=https://web.archive.org/web/20110521232833/http://aeea.nmns.edu.tw/2006/0607/ap060703.html |date=2011-05-21 }}
References
{{reflist|refs=
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| arxiv=0708.1752 | postscript=.
| bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600
}}
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| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| title=Spectroscopic study on the beryllium abundances of red giant stars
| journal=Publications of the Astronomical Society of Japan
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| last1=Takeda | first1=Yoichi | last2=Tajitsu | first2=Akito
| doi=10.1093/pasj/psu066 | bibcode=2014PASJ...66...91T
| arxiv=1406.7066 | postscript=. }}
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}}
| last1=Gontcharov | first1=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
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| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G
| arxiv=1606.08053 | s2cid=119231169
| postscript=. }}
| last1=Fernie | first1=J. D.
| title=New UBVRI photometry for 900 supergiants
| journal=Astrophysical Journal Supplement Series
| volume=52 | pages=7–22 |date=May 1983
| doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free}}
| title=The Perkins catalog of revised MK types for the cooler stars
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| doi=10.1086/191373 | bibcode=1989ApJS...71..245K }}
| title=The Bright Star Catalogue | edition=5th Revised Ed. (Preliminary Version)
| first1=D. | last1=Hoffleit | first2=W. H. | last2=Warren, Jr.
| publisher=CDS
| postscript=. }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=7488 HR 7488], database entry
| display-authors=1 | last1=Carney | first1=Bruce W.
| last2=Gray | first2=David F. | last3=Yong | first3=David
| last4=Latham | first4=David W. | last5=Manset | first5=Nadine
| last6=Zelman | first6=Rachel | last7=Laird | first7=John B.
| title=Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars
| journal=The Astronomical Journal
| volume=135 | issue=3 | pages=892–906 | date=March 2008
| doi=10.1088/0004-6256/135/3/892 | bibcode=2008AJ....135..892C
| arxiv=0711.4984 | s2cid=2756572 | postscript=. }}
| title=bet Sge | accessdate=2017-11-26 | postscript=. }}
}}
{{Stars of Sagitta}}
{{DEFAULTSORT:Beta Sagittae}}