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{{Starbox short
{{Starbox begin
| name=X Trianguli Australis
| name = X Trianguli Australis
⚫
| epoch=[[J2000.0]]
⚫
| constell=[[Triangulum Australe]]
⚫
|ra= {{RA|15|14|19.17535}}<ref name=SIMBAD/>
⚫
|dec= {{DEC|-70|04|46.1052}}<ref name=SIMBAD/>
| spectral= C5.5(Nb).
| appmag_v=+5.63
| dist_ly=1173
| dist_pc=360
| names=[[Star catalogue#BS, BSC, HR|HR]]&nbsp;5644, [[Henry Draper Catalogue|HD]]&nbsp;134453, [[Star catalogue#BD/CD/CPD|CPD]]&minus;69°&nbsp;2267, [[Hipparcos catalogue|HIP]]&nbsp;74582, [[Star catalogue#SAO|SAO]]&nbsp;253062
}}
}}
{{Starbox observe
⚫
'''X Trianguli Australis''' is a [[star]] in the [[constellation]] [[Triangulum Australe]]. It is a red-hued [[carbon star]] with an average [[apparent magnitude]] of +5.89. It is approximately 1173 [[light years]] (360 parsecs) from [[Earth]],<ref name=SIMBAD>{{cite simbad |title=V* X TrA |accessdate = 18 January 2013}}</ref> though this could vary by up to 200 light years.<ref name=kaler>{{cite web | url = http://stars.astro.illinois.edu/sow/xtra.html | title = X Trianguli Australis | last = Kaler | first = Jim | work = Stars | publisher = University of Illinois | accessdate = 18 January 2013 |date=19 October 2012 }}</ref> It is a semi-regular variable star with two periods of around 385 and 455 days, and is of [[Stellar classification|spectral type]] [[Stellar classification#Class C: carbon stars|C5.5(Nb)]].<ref>{{cite journal | title = Long-term Photometry and Periods for 261 Nearby Pulsating M Giants | last1 = Tabur | first1 = V. | last2 = Bedding | first2 = T. R. |author2-link= Tim Bedding| year = 2009
⚫
| epoch = J2000
⚫
| constell = [[Triangulum Australe]]
⚫
| ra = {{RA|15|14|19.17448}}<ref name=GaiaDR2>{{cite DR2}}</ref>
⚫
| dec = {{DEC|−70|04|46.1266}}<ref name=GaiaDR2/>
| appmag_v = +5.75<ref name=Anderson2012>{{cite journal | 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 }}</ref>
}}
{{Starbox character
| type =
| class = C5.5<ref name=Warner1963>{{cite journal | title=Spectral classification of some Southern late-type peculiar stars | last1=Warner | first1=B. | journal=Monthly Notices of the Royal Astronomical Society | volume=126 | page=61 | date=1963 | doi=10.1093/mnras/126.1.61 | bibcode=1963MNRAS.126...61W }}</ref>
| b-v = {{Val|3.271|0.019}}<ref name=Anderson2012/>
| u-b =
| variable = [[Slow irregular variable|Lb]]<ref name=gcvs>{{cite journal | 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 | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }}</ref>
}}
{{Starbox astrometry
| radial_v = {{Val|−3.2|1.5}}<ref name=Gontcharov2006>{{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 | postscript=. }}</ref>
| prop_mo_ra = +4.276<ref name=GaiaDR2/>
| prop_mo_dec = −7.566<ref name=GaiaDR2/>
| parallax = 3.5388
| p_error = 0.1944
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = −1.97<ref name=Anderson2012/>
}}
{{Starbox detail
| source =
| mass =
| radius =
| luminosity =
| luminosity_bolometric = 8,599<ref name=Rau2017>{{cite journal | title=The adventure of carbon stars. Observations and modeling of a set of C-rich AGB stars | display-authors=1 | last1=Rau | first1=G. | last2=Hron | first2=J. | last3=Paladini | first3=C. | last4=Aringer | first4=B. | last5=Eriksson | first5=K. | last6=Marigo | first6=P. | last7=Nowotny | first7=W. | last8=Grellmann | first8=R. | journal=Astronomy & Astrophysics | volume=600 | id=A92 | pages=21 | date=April 2017 | doi=10.1051/0004-6361/201629337 | bibcode=2017A&A...600A..92R }}</ref>
| gravity =
| temperature = {{Val|2860|350|fmt=commas}}<ref name=Rau2017/>
| metal_fe =
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names={{odlist | V=X TrA | CPD=−69°&nbsp;2267 | HD=134453 | HIP=74582 | HR=5644 | SAO=253062 | AAVSO=1504-69 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = X+TrA
}}
{{Starbox end}}

⚫
'''X Trianguli Australis''' is a [[star]] in the southern [[constellation]] [[Triangulum Australe]]. It is a red-hued [[carbon star]] with an average [[apparent magnitude]] of +5.89. It is approximately 1173 [[light years]] (360 parsecs) from [[Earth]],<ref name=SIMBAD>{{cite simbad |title=V* X TrA |accessdate = 18 January 2013}}</ref> though this could vary by up to 200 light years.<ref name=kaler>{{cite web | url = http://stars.astro.illinois.edu/sow/xtra.html | title = X Trianguli Australis | last = Kaler | first = Jim | work = Stars | publisher = University of Illinois | accessdate = 18 January 2013 |date=19 October 2012 }}</ref> It is a semi-regular variable star with two periods of around 385 and 455 days, and is of [[Stellar classification|spectral type]] [[Stellar classification#Class C: carbon stars|C5.5(Nb)]].<ref>{{cite journal | title = Long-term Photometry and Periods for 261 Nearby Pulsating M Giants | last1 = Tabur | first1 = V. | last2 = Bedding | first2 = T. R. |author2-link= Tim Bedding| year = 2009
| journal = [[Monthly Notices of the Royal Astronomical Society]] | volume = 400 | issue = 4 | pages = 1945–61 | doi = 10.1111/j.1365-2966.2009.15588.x |arxiv = 0908.3228 |bibcode = 2009MNRAS.400.1945T }}</ref> It ranges from magnitudes 5.03 to 6.05.<ref>{{cite web |url = http://www.aavso.org/vsx/index.php?view=detail.top&oid=36671 |title = X TrA |publisher = [[American Association of Variable Star Observers]] |work = International Variable Star Index |accessdate = 18 January 2013 |date = 11 November 2011}}</ref> Its designation is from the [[variable star designation]] developed by German astronomer [[Friedrich Wilhelm Argelander]].
| journal = [[Monthly Notices of the Royal Astronomical Society]] | volume = 400 | issue = 4 | pages = 1945–61 | doi = 10.1111/j.1365-2966.2009.15588.x |arxiv = 0908.3228 |bibcode = 2009MNRAS.400.1945T }}</ref> It ranges from magnitudes 5.03 to 6.05.<ref>{{cite web |url = http://www.aavso.org/vsx/index.php?view=detail.top&oid=36671 |title = X TrA |publisher = [[American Association of Variable Star Observers]] |work = International Variable Star Index |accessdate = 18 January 2013 |date = 11 November 2011}}</ref> Its designation is from the [[variable star designation]] developed by German astronomer [[Friedrich Wilhelm Argelander]].


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{{Stars of Triangulum Australe}}
{{Stars of Triangulum Australe}}


⚫
[[Category:Triangulum Australe]]
[[Category:C-type stars]]
[[Category:C-type stars]]
[[Category:Asymptotic-giant-branch stars]]
[[Category:Asymptotic-giant-branch stars]]
[[Category:Slow irregular variables]]
[[Category:Slow irregular variables]]
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[[Category:Triangulum Australe]]
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[[Category:Objects with variable star designations|Trianguli Australis, X]]
[[Category:HR objects|5644]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|134453]]
[[Category:Henry Draper Catalogue objects|134453]]
[[Category:Hipparcos objects|074582]]
[[Category:Hipparcos objects|074582]]
[[Category:Durchmusterung objects]]
[[Category:HR objects|5644]]
⚫
[[Category:Objects with variable star designations|Trianguli Australis, X]]

{{var-star-stub}}
{{giant-star-stub}}

Revision as of 13:13, 7 September 2018

X Trianguli Australis
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe
Right ascension 15h 14m 19.17448s[1]
Declination −70° 04′ 46.1266″[1]
Apparent magnitude (V) +5.75[2]
Characteristics
Spectral type C5.5[3]
B−V color index 3.271±0.019[2]
Variable type Lb[4]
Astrometry
Radial velocity (Rv)−3.2±1.5[5] km/s
Proper motion (μ) RA: +4.276[1] mas/yr
Dec.: −7.566[1] mas/yr
Parallax (π)3.5388 ± 0.1944 mas[1]
Distance920 ± 50 ly
(280 ± 20 pc)
Absolute magnitude (MV)−1.97[2]
Details
Luminosity (bolometric)8,599[6] L☉
Temperature2,860±350[6] K
Other designations
X TrA, CPD−69° 2267, HD 134453, HIP 74582, HR 5644, SAO 253062[7]
Database references
SIMBADdata

X Trianguli Australis is a star in the southern constellation Triangulum Australe. It is a red-hued carbon star with an average apparent magnitude of +5.89. It is approximately 1173 light years (360 parsecs) from Earth,[7] though this could vary by up to 200 light years.[8] It is a semi-regular variable star with two periods of around 385 and 455 days, and is of spectral type C5.5(Nb).[9] It ranges from magnitudes 5.03 to 6.05.[10] Its designation is from the variable star designation developed by German astronomer Friedrich Wilhelm Argelander.

It is a cool star, with estimates of its surface temperature ranging from 2200 to 2700 Kelvin.[8] A giant star, its diameter is 400 times that of the sun, and if placed at the center of the Solar System would stretch out to 30% further than Mars' orbit. Its absolute magnitude is −2.0.[8]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. ^ a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. ^ Warner, B. (1963). "Spectral classification of some Southern late-type peculiar stars". Monthly Notices of the Royal Astronomical Society. 126: 61. Bibcode:1963MNRAS.126...61W. doi:10.1093/mnras/126.1.61.
  4. ^ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  5. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. ^ a b Rau, G.; et al. (April 2017). "The adventure of carbon stars. Observations and modeling of a set of C-rich AGB stars". Astronomy & Astrophysics. 600: 21. Bibcode:2017A&A...600A..92R. doi:10.1051/0004-6361/201629337. A92.
  7. ^ a b "V* X TrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 January 2013.
  8. ^ a b c Kaler, Jim (19 October 2012). "X Trianguli Australis". Stars. University of Illinois. Retrieved 18 January 2013.
  9. ^ Tabur, V.; Bedding, T. R. (2009). "Long-term Photometry and Periods for 261 Nearby Pulsating M Giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x.
  10. ^ "X TrA". International Variable Star Index. American Association of Variable Star Observers. 11 November 2011. Retrieved 18 January 2013.
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