V520 Carinae

V520 Carinae

A light curve for V520 Carinae, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 43m 32.29015s[2]
Declination −60° 33′ 59.8308″[2]
Apparent magnitude (V) +4.58[3] (4.50 to 4.59)
Characteristics
Spectral type K4III[4]
B−V color index +1.700±0.059[3]
Variable type Lc:[5]
Astrometry
Radial velocity (Rv)+9.1±0.3[3] km/s
Proper motion (μ) RA: −14.75[2] mas/yr
Dec.: +3.10[2] mas/yr
Parallax (π)2.86 ± 0.17 mas[2]
Distance1,140 ± 70 ly
(350 ± 20 pc)
Absolute magnitude (MV)−3.63[3]
Details
Mass7.9±0.1[6] M☉
Radius131.18+4.67
−6.61[7] R☉
Luminosity3,599±297[7] L☉
Temperature3,903+102
−68[7] K
Age33.3±5.1[6] Myr
Other designations
w Car, V520 Car, NSV 4951, CD−59°3262, FK5 2524, GC 14762, HD 93070, HIP 52468, HR 4200, SAO 251090[8]
Database references
SIMBADdata

V520 Carinae is a single[9] star in the southern constellation of Carina. It has the Bayer designation w Carinae, while V520 Carinae is a variable star designation. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.58.[3] It is located at a distance of approximately 1,140 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +9 km/s.[3] It is a candidate member of the IC 2391 moving group of co-moving stars.[10]

This is an aging giant star with a stellar classification of K4III,[4] although Humphreys (1970) found a supergiant class of K3Ib.[11] It is a suspected slow irregular variable of type Lc and its brightness varies from magnitude +4.50 to +4.59 with no periodicity.[12] The star now has 131 times the girth of the Sun,[7] having exhausted the supply of hydrogen at its core then cooled and expanded. Comparison with theoretical evolutionary tracks suggests it is 33 million years old with 7.9 times the mass of the Sun,[6] although analysis of its motion suggests it may be an astrometric binary with a mass of 1.014 M☉.[13] The star is radiating 3,600[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,903 K.[7]

  1. ^ Cite error: The named reference HipDataAccess was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Montes2001 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Humphreys1970 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference vsx was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference kervella2019 was invoked but never defined (see the help page).