HR 3643

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Template:Short description

HR 3643
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.48 + 14.50[2]
Characteristics
Spectral type F8II[3] + DA1.6[2]
B−V Template:Engvar Script error: No such module "val".[4]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: −8.81[1] mas/yr
Dec.: −5.26[1] mas/yr
Parallax (π)8.14±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.98[4]
Details
A
RadiusScript error: No such module "val".[6] Template:Solar radius
LuminosityScript error: No such module "val".[6] Template:Solar luminosity
TemperatureScript error: No such module "val".[6] K
Metallicity [Fe/H]Script error: No such module "val".[4] dex
Rotational velocity (v sin i)53[7] km/s
B
Mass0.74[2] Template:Solar mass
Surface gravity (log g)7.47[8] cgs
Temperature21,551[8] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age25[8] Myr
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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HR 3643 is a binary star[2][7] system in the southern constellation of Carina. It has the Bayer designation G Carinae, with HR 3643 being the star's designation in the Bright Star Catalogue. The system is visible to the naked eye with an apparent visual magnitude of 4.48.[2] It is located at a distance of approximately 401 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22.5 km/s.[5]

The binary nature of this system was first detected as an ultraviolet excess in 1996. No radial velocity variation has been detected so it must be a wide system with an orbital period of up to 21 years.[10] The estimated semimajor axis of their orbit is Script error: No such module "val"..[2] The pair were not resolved using the Hubble Space Telescope WFPC2 instrument.[10]

The primary is an evolved bright giant star with a yellow-white hue and a stellar classification of F8II.[3] With the supply of hydrogen exhausted at its core, it has expanded to 13[6] times the Sun's radius. It has a relatively high projected rotational velocity of 53 km/s for a star of this class, suggesting it is an intermediate-mass star with 2–5 times the mass of the Sun.[7] The star is radiating 206[6] times the luminosity of the Sun from its photosphere at an effective temperature of 6,030 K.[6]

The magnitude 14.50[2] companion is a white dwarf with a class of DA1.6.[2] It has a mass estimated at 74%[2] of the mass of the Sun and a temperature of 21,551 K, indicating a cooling time of 25 million years.[8] This object is a source for hard X-ray emission.[11] The primary is one of the most massive stars known to have a white dwarf companion.[7]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1".
  2. ↑ a b c d e f g h i Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b c d e f Template:Cite Gaia DR2
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ a b c d Script error: No such module "citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Carina

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