R Carinae
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 3.9 - 10.5[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M6/7pe[5] |
| B−V Template:Engvar | Script error: No such module "val".[6] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: +19.535 mas/yr[2] |
| Parallax (π) | 5.5018±0.3345 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 1.48[6] (at mv = 7.43) |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | Script error: No such module "val". (2013)[7] Template:Solar radius Script error: No such module "val". (2018)[8] Template:Solar radius Script error: No such module "val". (2020)[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[4] Template:Solar luminosity |
| Temperature | 2,800[9] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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R Carinae is a double star in the southern constellation of Carina. The brighter component is a variable star that can be viewed with the naked eye at peak brightness,[11] but is usually too faint to be seen without a telescope, having an apparent visual magnitude that fluctuates around 7.43.[6] This star is located at a distance of approximately 600 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +28 km/s.[6]
Benjamin Apthorp Gould discovered the variable star, in 1871. It appeared with its variable star designation in Annie Jump Cannon's 1907 work, Second Catalogue of Variable Stars.[12] The main component is an aging red giant star on the asymptotic giant branch[4] with a stellar classification of M6/7pe.[5] It is classified as a pulsating Mira type variable star and its visual brightness varies with an average amplitude of 4.25 magnitudes over a period of Script error: No such module "val".. Its average maximum visual magnitude is Script error: No such module "val".,[11] but the brightest observed maximum was magnitude 3.9.[3] The pulsations make its size change, in 2014, it was Script error: No such module "convert". times larger than the Sun, while in 2020 it was Script error: No such module "val". times larger.[7] This star is surrounded by a dusty shell, with properties that are consistent with iron-poor silicates or corundum, extending from around three stellar radii outward.[13]
The companion is a magnitude 11.30 star at an angular separation of Script error: No such module "val". along a position angle of 132° from the main star, as of 2015.[14]
References
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