S Trianguli Australis

{{Short description|Variable star in the constellation Triangulum Australe}}

{{Starbox begin

| name = S Trianguli Australis

}}

{{Starbox image

| image = 250px

| caption = A light curve for S Trianguli Australis, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000

| constell = Triangulum Australe

| ra = {{RA|16|01|10.71590}}

| dec = {{DEC|-63|46|35.5324}}

| appmag_v = {{nowrap|6.41 (5.95 – 6.81)}}

}}

{{Starbox character

| type =

| class = F8 II

| b-v = {{Val|0.567|0.020}}

| u-b =

| variable = δ Cep

}}

{{Starbox astrometry

| radial_v = {{Val|2.2|1.3}}

| prop_mo_ra = −2.244

| prop_mo_dec = −2.804

| parallax = 1.0753

| p_error = 0.0301

| parallax_footnote =

| absmag_v = −3.53

}}

{{Starbox detail

| source =

| mass = 2.8

| radius = 39.2

| luminosity =

| gravity = {{Val|2.1|0.1}}

| temperature = {{Val|5976|67|fmt=commas}}

| metal_fe = {{Val|0.12|0.05}}

| rotational_velocity =

| age_myr =

}}

{{Starbox catalog

| names={{odlist | V=S TrA | CD=-63° 1146 | HD=142941 | HIP=78476 | HR=5939 | SAO=253377 }}

}}

{{Starbox reference

| Simbad = S+TrA

}}

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. Based upon an annual parallax shift of {{Val|1.08|ul=mas}}, 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. It is a bright giant with a nominal stellar classification of F8 II, that pulsates between spectral types F6II-G2. The star has 2.8 times the mass of the Sun and 39.2 times the Sun's radius. It is losing mass at the estimated rate of {{Val|2.8e−10|u={{Solar mass}}·yr⁻¹}}.

References

{{reflist|refs=

{{cite journal

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| location=Ann Arbor, Michigan

| year=1979 | volume=1 | bibcode=1978mcts.book.....H }}

{{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 }}

{{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

| s2cid=119257644

}}

{{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

| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}

{{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 | s2cid=122745580

}}

{{cite web |title=Light Curve |url=https://www.cosmos.esa.int/web/hipparcos/java-tools/light-curve |website=Hipparcos ESA |publisher=ESA |access-date=17 February 2022}}

{{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 | s2cid=119258214 }}

{{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