HD 80230

This article is about g Carinae. For G Carinae, see HD 78791.
HD 80230
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 09h 16m 12.07286s[1]
Declination −57° 32′ 29.3007″[1]
Apparent magnitude (V) 4.34[2]
Characteristics
Spectral type M0.5IIIa[3]
B−V color index +1.602±0.079[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)−5.2±0.7[2] km/s
Proper motion (μ) RA: −27.15[1] mas/yr
Dec.: −14.18[1] mas/yr
Parallax (π)6.68 ± 0.15 mas[1]
Distance490 ± 10 ly
(150 ± 3 pc)
Absolute magnitude (MV)−1.53[2]
Details
Mass2.2±0.3[5] M☉
Radius74.86+3.84
−5.71[6] R☉
Luminosity1,172±60[6] L☉
Surface gravity (log g)0.95±0.12[5] cgs
Temperature3,904+158
−96[6] K
Other designations
g Car, NSV 4440, CPD−57°1961, GC 12813, HD 80230, HIP 45496, HR 3696, SAO 236787[7]
Database references
SIMBADdata

HD 80230 is a single[8] star in the southern constellation of Carina, near the northern constellation border with Vela. It has the Bayer designation g Carinae, while HD 80230 is the star's identifier in the Henry Draper catalogue. This is a suspected variable star with a brightness that has been measured varying from magnitude 4.31 down to 4.35,[4] both of which is bright enough for the star to be visible to the naked eye. The distance to this object is approximately 490 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −5 km/s.[2]

This object is an aging red giant, currently on the asymptotic giant branch,[9] with a stellar classification of M0.5IIIa.[3] It is a mild barium star, showing trace enhancement of s-process elements in its spectrum.[10] The star has 2.2[5] times the mass of the Sun and has expanded to 75[6] times the Sun's radius. It is radiating 1,172 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,904 K.[6]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Kallinger2019 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Lu1991 was invoked but never defined (see the help page).