R Carinae

R Carinae
	; Thevisual bandlight curveof R Carinae, from AAVSO data
Observation data; EpochJ2000.0EquinoxJ2000.0
Constellation	Carina
Right ascension	09h32m14.59964s
Declination	−62° 47′ 20.0452″
Apparent magnitude(V)	3.9 - 10.5
Characteristics
Evolutionary stage	AGB
Spectral type	M6/7pe
B−Vcolor index	0.906±0.009
Variable type	Mira
Astrometry
Radial velocity(Rv)	+28.1±1.0km/s
Proper motion(μ)	RA:−37.900mas/yr; Dec.:+22.232mas/yr
Parallax(π)	2.5813 ± 0.4460mas
Distance	approx. 1,300ly; (approx. 390pc)
Absolute magnitude(MV)	1.48(at mv= 7.43)
Details
Mass	0.87+0.47; −0.31M☉
Radius	241.0+37.6; −32.6R☉
Luminosity	4,571+1,331; −1,031L☉
Temperature	2,800K
Other designations
	R Car,CD−62°396,GC13192,HD82901,HIP46806,HR3816,SAO250614,CCDMJ09322-6247,WDSJ09322-6247AB
Database references
SIMBAD	data

R Carinaeis adouble starin the southernconstellationofCarina.The brighter component is avariable starthat can be viewed with the naked eye at peak brightness,^[9]but is usually too faint to be seen without a telescope, having anapparent visual magnitudethat fluctuates around 7.43.^[6]This star is located at a distance of approximately 1,300light yearsfrom theSunbased onparallax,and is drifting further away with aradial velocityof +28 km/s.^[6]

The main component is an agingred giantstar on theasymptotic giant branch^[4]with astellar classificationof M6/7pe.^[5]It is classified as a pulsatingMira type variable starand itsvisual brightnessvaries with an average amplitude of 4.25 magnitudes over a period of303.99±1.08 d.Its average maximum visual magnitude is5.05±0.45,^[9]but the brightest observed maximum was magnitude 3.9^[3]This star is surrounded by a dusty shell, with properties that are consistent with iron-poorsilicatesorcorundum,extending from around three stellar radii outward.^[10]

The companion is a magnitude 11.30 star at anangular separationof2.10″along aposition angleof 132° from the main star, as of 2015.^[11]

References

^"Download Data".aavso.org.AAVSO.Retrieved1 October2021.
^^a ^b ^c ^d ^eBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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.Gaia DR2 record for this sourceatVizieR.
^^a ^b ^cSamus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports,5.1,61(1): 80–88,Bibcode:2017ARep...61...80S,doi:10.1134/S1063772917010085,S2CID 125853869.
^^a ^b ^c ^d ^eTakeuti, Mine; et al. (2013), "A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars",Publications of the Astronomical Society of Japan,65(3): 60,Bibcode:2013PASJ...65...60T,doi:10.1093/pasj/65.3.60.
^^a ^bHouk, Nancy; Cowley, A. P. (1979),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan,Bibcode:1978mcts.book.....H.
^^a ^b ^c ^d ^eAnderson, 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,S2CID 119257644.
^McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars",Monthly Notices of the Royal Astronomical Society,427(1): 343,arXiv:1208.2037,Bibcode:2012MNRAS.427..343M,doi:10.1111/j.1365-2966.2012.21873.x,S2CID 118665352.
^"R Car".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-01-30.
^^a ^bVogt, N.; et al. (2016), "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified As Mira in the All Sky Automated Survey (Asas)",The Astrophysical Journal Supplement Series,227(1): 6,arXiv:1609.05246,Bibcode:2016ApJS..227....6V,doi:10.3847/0067-0049/227/1/6,S2CID 119295645.
^Ireland, M. J.; et al. (July 2005), "Dust scattering in the Miras R Car and RR Sco resolved by optical interferometric polarimetry",Monthly Notices of the Royal Astronomical Society,361(1): 337–344,arXiv:astro-ph/0505112,Bibcode:2005MNRAS.361..337I,doi:10.1111/j.1365-2966.2005.09181.x,S2CID 14724805.
^Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog",The Astronomical Journal,122(6): 3466,Bibcode:2001AJ....122.3466M,doi:10.1086/323920.

[aavso-1] "Download Data".aavso.org.AAVSO.Retrieved1 October2021.

[GaiaDR2-2] Brown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData 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.Gaia DR2 record for this sourceatVizieR.

[Samus2017-3] Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports,5.1,61(1): 80–88,Bibcode:2017ARep...61...80S,doi:10.1134/S1063772917010085,S2CID 125853869.

[takeuti2013-4] Takeuti, Mine; et al. (2013), "A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars",Publications of the Astronomical Society of Japan,65(3): 60,Bibcode:2013PASJ...65...60T,doi:10.1093/pasj/65.3.60.

[houk1979-5] Houk, Nancy; Cowley, A. P. (1979),Michigan catalogue of two-dimensional spectral types for the HD stars,vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan,Bibcode:1978mcts.book.....H.

[Anderson2012-6] 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,S2CID 119257644.

[mcdonald2012-7] McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars",Monthly Notices of the Royal Astronomical Society,427(1): 343,arXiv:1208.2037,Bibcode:2012MNRAS.427..343M,doi:10.1111/j.1365-2966.2012.21873.x,S2CID 118665352.

[SIMBAD-8] "R Car".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-01-30.

[vogt2016-9] Vogt, N.; et al. (2016), "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified As Mira in the All Sky Automated Survey (Asas)",The Astrophysical Journal Supplement Series,227(1): 6,arXiv:1609.05246,Bibcode:2016ApJS..227....6V,doi:10.3847/0067-0049/227/1/6,S2CID 119295645.

[Ireland2005-10] Ireland, M. J.; et al. (July 2005), "Dust scattering in the Miras R Car and RR Sco resolved by optical interferometric polarimetry",Monthly Notices of the Royal Astronomical Society,361(1): 337–344,arXiv:astro-ph/0505112,Bibcode:2005MNRAS.361..337I,doi:10.1111/j.1365-2966.2005.09181.x,S2CID 14724805.

[WDSC2014-11] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog",The Astronomical Journal,122(6): 3466,Bibcode:2001AJ....122.3466M,doi:10.1086/323920.

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Observation data EpochJ2000.0EquinoxJ2000.0
Thevisual band light curveof R Carinae, from AAVSO data^[1]
Constellation	Carina
Right ascension	09^h32^m14.59964^s^[2]
Declination	−62° 47′ 20.0452″^[2]
Apparent magnitude(V)	3.9 - 10.5^[3]
Characteristics
Evolutionary stage	AGB^[4]
Spectral type	M6/7pe^[5]
B−Vcolor index	0.906±0.009^[6]
Variable type	Mira^[3]
Astrometry

Radial velocity(R_v)	+28.1±1.0^[6]km/s
Proper motion(μ)	RA:−37.900^[2]mas/yr Dec.:+22.232^[2]mas/yr
Parallax(π)	2.5813 ± 0.4460mas^[2]
Distance	approx. 1,300ly (approx. 390pc)
Absolute magnitude(M_V)	1.48^[6](at m_v= 7.43)

Details

Mass	0.87+0.47 −0.31^[4]`M`_☉
Radius	241.0+37.6 −32.6^[4]`R`_☉
Luminosity	4,571+1,331 −1,031^[4]`L`_☉
Temperature	2,800^[7]K

Other designations
R Car,CD−62°396,GC13192,HD82901,HIP46806,HR3816,SAO250614,CCDMJ09322-6247,WDSJ09322-6247AB^[8]
Database references
SIMBAD	data