Login
Login

R Trianguli Australis

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

{{Starbox begin

| name = R Trianguli Australis

}}

{{Starbox image

| image = 250px

| caption = A light curve for R Trianguli Astralis, plotted from TESS data

}}

{{Starbox observe

| epoch = J2000

| constell = Triangulum Australe

| ra = {{RA|15|19|45.71231}}

| dec = {{DEC|-66|29|45.7417}}

| appmag_v = {{nowrap|6.73 (6.33 - 6.90)}}

}}

{{Starbox character

| type =

| class = F7 Ib/II

| b-v =

| u-b =

| variable = δ Cep

}}

{{Starbox astrometry

| radial_v = {{Val|−13.2|1.6}}

| prop_mo_ra = −5.113

| prop_mo_dec = −8.317

| parallax = 1.4754

| p_error = 0.0371

| parallax_footnote =

| absmag_v = 2.69

}}

{{Starbox detail

| source =

| mass = 5.42 or 5.66

| radius = {{Val|24.7|1.9}} or {{Val|35.8|0.8}}

| luminosity =

| gravity = 2.10

| temperature = {{Val|5852|21|fmt=commas}}

| metal_fe = {{Val|+0.06|0.08}}

| rotational_velocity = 16

| age_myr =

}}

{{Starbox catalog

| names={{odlist | V=R TrA | CD=-66° 1728 | HD=135592 | HIP=75018 | HR= | SAO=253107 }}

}}

{{Starbox reference

| Simbad = R+TrA

}}

{{Starbox end}}

R Trianguli Australis is a yellow-white hued variable star in the southern constellation Triangulum Australe. It is near the limit of visibility to the naked eye, having a typical apparent visual magnitude of 6.73. Based upon an annual parallax shift of {{Val|1.48|ul=mas}}, it is located 2,210 light years away. R TrA is moving closer with a heliocentric radial velocity of −13 km/s.

This is a Classical Cepheid variable with an apparent magnitude that ranges from 6.33 to 6.90 over 3.38926 days. It is a bright giant/supergiant with a nominal stellar classification of F7 Ib/II, but pulsates between spectral types F5Ib/II-G5. Depending on the method employed, the estimated mass is 5.42 or 5.66 times the mass of the Sun and it has 24.7 or 35.8 times the Sun's radius. R TrA has an infrared excess that is being emitted by circumstellar silicate dust heated to 150–200 K. It is losing mass at the rate of {{Val|4e−9|u={{solar mass}}·y−1}}.

References

{{reflist|refs=

{{cite simbad | title=R TrA | access-date=5 September 2018 }}

{{cite DR2}}

{{citation

| last1=Gontcharov | first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system

| journal=Astronomy Letters

| volume=32| issue=11| pages=759–771| date=November 2006

| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G

| arxiv=1606.08053 | s2cid=119231169

| postscript=. }}

{{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

| volume=61 | issue=1 | pages=80 | year=2017 | postscript=.

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

{{cite book

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

| last1=Houk | first1=Nancy | last2=Cowley | first2=A. P.

| location=Ann Arbor, Michigan

| publisher=Dept. of Astronomy, University of Michigan

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

{{cite journal

| title=The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids

| display-authors=1 | last1=Luck | first1=R. E.

| last2=Andrievsky | first2=S. M. | last3=Kovtyukh | first3=V. V.

| last4=Gieren | first4=W. | last5=Graczyk | first5=D.

| journal=The Astronomical Journal

| volume=142 | issue=2 | id=51 | pages=12 | date=August 2011

| doi=10.1088/0004-6256/142/2/51 | bibcode=2011AJ....142...51L

| arxiv=1106.0182 | s2cid=119288363 }}

{{cite web

| title=R Trianguli Australis

| last1=Watson | first1=Christopher

| date=4 January 2010 | work=AAVSO Website

| publisher=American Association of Variable Star Observers

| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=36665

| accessdate=23 May 2015 }}

{{cite journal

| title=Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids

| journal=Acta Astronomica

| last1=Moskalik | first1=P. | last2=Gorynya | first2=N. A.

| volume=55 | pages=247 | year=2005

| bibcode=2005AcA....55..247M | arxiv=astro-ph/0507076 }}

{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=8 December 2021}}

{{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

}}

}}

{{Stars of Triangulum Australe}}

{{DEFAULTSORT:R Trianguli Australis}}

Category:F-type bright giants

Category:Classical Cepheid variables

Category:Triangulum Australe

Category:Durchmusterung objects

135592

075018

Trianguli Australis, R