}}{{Starbox reference
| Simbad = S+TrA
}}{{Starbox end}}S Trianguli Australis is a yellow-white hued variable star in the constellation Triangulum Australe. It is a dim star near the lower limit of visibility with the naked eye, having a typical apparent visual magnitude of 6.41.[3] Based upon an annual parallax shift of {{Val|1.08|ul=mas}},[1] it is located 3,030 light years from the Earth.
A Classical Cepheid variable, its apparent magnitude ranges from 5.95 to 6.81 over 6.32344 days.[4] It is a bright giant with a nominal stellar classification of F8 II,[5] that pulsates between spectral types F6II-G2.[4] The star has 2.8 times the mass of the Sun and 39.2 times the Sun's radius.[13] It is losing mass at the estimated rate of {{Val|2.8e−10|u={{Solar mass}}·yr−1}}.[12]
References
1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 {{cite journal | title=Michigan catalogue of two-dimensional spectral types for the HD stars | journal=Ann Arbor : Dept. Of Astronomy | last1=Houk | first1=Nancy | last2=Cowley | first2=A. P. | publication-place=Ann Arbor, Michigan | year=1979 | volume=1 | bibcode=1978mcts.book.....H }}
3. ^1 2 3 {{cite web | title=S Trianguli Australis | date=4 January 2010 | last1=Watson | first1=Christopher | website=AAVSO Website | publisher=American Association of Variable Star Observers | url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=36666 | accessdate=23 May 2015 }}
4. ^1 {{citation | postscript=. | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | arxiv=1108.4971 | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 }}
5. ^1 {{citation | title=General catalogue of variable stars: Version GCVS 5.1 | last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V | last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N | last5=Pastukhova | first5=E. N | journal=Astronomy Reports | volume=61 | issue=1 | pages=80 | year=2017 | postscript=. | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }}
6. ^1 2 3 {{cite journal | title=Spectroscopic studies of Cepheids in Circinus (AV Cir, BP Cir) and Triangulum Australe (R TrA, S TrA, U TrA, LR TrA) | journal=Astronomy Letters | last1=Usenko | first1=I. A. | last2=Kniazev | first2=A. Yu. | last3=Berdnikov | first3=L. N. | last4=Kravtsov | first4=V. V. | volume=40 | issue=12 | pages=800 | year=2014 | bibcode=2014AstL...40..800U | doi=10.1134/S1063773714110061 }}
7. ^1 2 3 4 5 {{cite journal | last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François | last3=Brouillet | first3=Nathalie | last4=Chemin | first4=Laurent | title=The PASTEL catalogue: 2016 version | journal=Astronomy & Astrophysics | display-authors=1 | volume=591 | issue=118 | pages=A118 | year=2016 | bibcode=2016A&A...591A.118S | arxiv=1605.07384 | doi=10.1051/0004-6361/201628497 }}
8. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
9. ^1 2 {{citation | last1=Neilson | first1=Hilding R. | last2=Lester | first2=John B. | title=On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation | journal=The Astrophysical Journal | volume=684 | issue=1 | pages=569–587 | date=September 2008 | doi=10.1086/588650 | bibcode=2008ApJ...684..569N | postscript=. |arxiv = 0803.4198 }}