13 Sagittae
{{Short description|Star in the constellation Sagitta}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A visual band light curve for VZ Sagittae, plotted from data published by Tabur et al. (2009)
}}
{{Starbox observe
| epoch = J2000
| constell = Sagitta
| dec = {{DEC|+17|30|59.4373}}
}}
{{Starbox character
| type = AGB
| u-b =
| variable = semiregular
}}
{{Starbox astrometry
| radial_v = {{Val|−17.56|0.33}}
| parallax = 3.20
| p_error = 0.31
}}
{{Starbox detail
| source =
| temperature = {{Val|3844|251|fmt=commas}}
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | F=13 Sge | V=VZ Sge | BD=+17°4183 | HD=189577 | HIP=98438 | HR=7645 | SAO=105522 | WDS=J20001+1731C }}
}}
{{Starbox reference
| Simbad = 13+Sge
}}
{{Starbox end}}
13 Sagittae is a single star in the northern constellation of Sagitta. The designation comes from the star catalogue of John Flamsteed, first published in 1712. It can be viewed with the naked eye, having an apparent visual magnitude varying between 5.27 and 5.57. Based upon an annual parallax shift of 3.20 mas as seen from Earth's orbit, it is located at a distance of around {{convert|310|pc|ly}}. It is moving closer to the Sun with a heliocentric radial velocity of −17.56 km/s.
| class="wikitable" style="text-align: center; float: left; margin: 0.5em;"
! Period ! Amplitude | |
| 36.5 | 0.082 |
| 39.2 | 0.043 |
| 51.4 | 0.031 |
| 65.2 | 0.030 |
This is an evolved red giant with a stellar classification of M4 III – a star that has used up its core hydrogen and has expanded – and is currently on the asymptotic giant branch. Classified as a semiregular variable and given the variable star designation VZ Sagittae, it varies between apparent magnitudes 5.27 and 5.57. Il has expanded to around 186 times the Sun's radius.
There is a magnitude 9.96 companion located at an angular separation of 112.6 arcseconds along a position angle of 297°, as of 2013. Designated HD 351107, this is a class F0 star.
{{clear left}}
References
{{reflist|refs=
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | year=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}
| title=The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
| last1=Nesterov | first1=V. V. | last2=Kuzmin | first2=A. V.
| last3=Ashimbaeva | first3=N. T. | last4=Volchkov | first4=A. A.
| last5=Röser | first5=S. | last6=Bastian | first6=U.
| journal=Astronomy and Astrophysics
| volume=110 | year=1995 | page=367 | display-authors=1
| bibcode=1995A&AS..110..367N }}
| display-authors = 1 | last1=Famaey | first1=B.
| last2=Jorissen | first2=A. | last3=Luri | first3=X.
| last4=Mayor | first4=M. | last5=Udry | first5=S.
| last6=Dejonghe | first6=H. | last7=Turon | first7=C.
| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters
| journal=Astronomy and Astrophysics
| volume=430 | pages=165–186 | date=January 2005
| doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F
| arxiv=astro-ph/0409579 | s2cid=17804304 }}
{{cite DR3|1820484908501127040}}
{{cite journal | display-authors=1
| last1=Tabur | first1=V. | last2=Bedding | first2=T. R.
| last3=Kiss | first3=L. L. | last4=Moon | first4=T. T.
| last5=Szeidl | first5=B. | last6=Kjeldsen | first6=H.
| title=Long-term photometry and periods for 261 nearby pulsating M giants
| journal=Monthly Notices of the Royal Astronomical Society
| volume=400 | issue=4 | pages=1945–1961 | date=December 2009
| doi=10.1111/j.1365-2966.2009.15588.x | doi-access=free | bibcode=2009MNRAS.400.1945T
| arxiv=0908.3228 | s2cid=15358380 }}
| title=Ultraviolet emission from main-sequence companions of AGB stars
| journal=Monthly Notices of the Royal Astronomical Society
| last1=Ortiz | first1=Roberto | last2=Guerrero | first2=Martín A.
| volume=461 | issue=3 | pages=3036 | year=2016
| doi=10.1093/mnras/stw1547 | doi-access=free
| bibcode=2016MNRAS.461.3036O
| arxiv=1606.09086 | s2cid=118619933
}}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 }}
{{cite journal | display-authors=1
| last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F.
| last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A.
| title=The PASTEL catalogue of stellar parameters
| journal=Astronomy and Astrophysics
| volume=515 | page=A111 | date=June 2010
| doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S
| arxiv=1004.1069 | s2cid=118362423 }}
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=27385
| title=VZ Sagittae | author=VSX | date=25 August 2009
| work=AAVSO Website | publisher=American Association of Variable Star Observers
| accessdate=4 January 2015 }}
{{cite simbad | title=13 Sge | access-date=2018-02-28 }}
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog
| journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}
}}
{{Stars of Sagitta}}
{{DEFAULTSORT:13 Sagittae}}
Category:Semiregular variable stars