V382 Carinae

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V382 Carinae
Carina constellation map.svg
Red circle.svg
Location of V382 Carinae (circled)
Observation data
Epoch J2000        Equinox J2000
Constellation Carina
Right ascension 11h 08m 35.39s [1]
Declination −58° 58 30.1 [1]
Apparent magnitude  (V)+3.83 [2] (3.84 - 4.02 [3] )
Characteristics
Spectral type G0-4-Ia+ [4]
U−B color index +0.96 [2]
B−V color index +1.26 [2]
Variable type Slow irregular variable [5]
Astrometry
Radial velocity (Rv)+6.00 [6]  km/s
Proper motion (μ)RA: −4.97 [1]   mas/yr
Dec.: 1.67 [1]   mas/yr
Parallax (π)0.52 ± 0.17  mas [1]
Distance approx. 6,000  ly
(approx. 1,900  pc)
Absolute magnitude  (MV)−9.0 [4]
Details
Mass 24±5.1 [7]   M
Radius 485 ± 56 [8] [lower-alpha 1]   R
Luminosity 212,000 ± 12,300 [8]   L
Surface gravity (log g)0.50 [9]   cgs
Temperature 5,625 ± 312 [8]   K
Metallicity +0.05 [9]
Age 6.8 [7]   Myr
Other designations
x  Carinae, HR  4337, HD  96918, CP−58°3189, FK5  1289, HIP  54463, SAO  238813, GC  15329
Database references
SIMBAD data

V382 Carinae, also known as x Carinae (x Car), is a yellow hypergiant in the constellation Carina. It is a G-type star with a mean apparent magnitude of +3.93, and a variable star of low amplitude.

Contents

Variability

A light curve for V382 Carinae, plotted from Hipparcos data V382CarLightCurve.png
A light curve for V382 Carinae, plotted from Hipparcos data

The radial velocity of V382 Carinae has long been known to be variable, but variations in its brightness were unclear. Brightness variations were detected by some observers, but others found it to be constant. [11] It was formally named as a variable star in 1981, listed in the General Catalogue of Variable Stars as a possible δ Cephei variable. [12] [3] It has been described as a pseudo-Cepheid, a supergiant with pulsations similar to a Cepheid but less regular. [9]

Analysis of Hipparcos photometry showed clear variation with a maximum range of 0.12 magnitudes and the star was treated as an α Cygni variable. A period of 556 days was suggested, but it is not entirely consistent. [13] It is now generally treated as a semiregular or irregular supergiant. [9] [5]

Properties

V382 Carinae V382 Carinae.jpg
V382 Carinae

V382 Car is the brightest yellow hypergiant in the night sky, easily visible to the naked eye and brighter than Rho Cassiopeiae although not visible from much of the northern hemisphere. It is 6,200 light years from Earth and around 500 times the radius of the Sun. [8] The large size means that V382 Car is over 200,000 times as luminous as the sun. The low infrared excess suggest that V382 Carinae may be cooling towards a red supergiant phase, less common than yellow hypergiants evolving towards hotter temperatures. [4] [14]

Notes

  1. Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772  K :

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References

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