HR 3643

Last updated
HR 3643
Observation data
Epoch J2000        Equinox J2000
Constellation Carina
Right ascension 09h 05m 08.81309s [1]
Declination −72° 36 09.7437 [1]
Apparent magnitude  (V)4.48 + 14.50 [2]
Characteristics
Spectral type F8II [3] + DA1.6 [2]
B−V color index +0.607±0.010 [4]
Astrometry
Radial velocity (Rv)+22.5±0.7 [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]
Distance 401 ± 7  ly
(123 ± 2  pc)
Absolute magnitude  (MV)−0.98 [4]
Details
A
Radius 13.15+1.03
−0.53
[6]   R
Luminosity 206.2±5.4 [6]   L
Temperature 6,030+127
−222
[6]   K
Metallicity [Fe/H]−0.04±0.04 [4]   dex
Rotational velocity (v sin i)53 [7]  km/s
B
Mass 0.74 [2]   M
Surface gravity (log g)7.47 [8]   cgs
Temperature 21,551 [8]   K
Age 25 [8]   Myr
Other designations
G Car, CPD−72°779, FK5  2720, GC  12595, HD  78791, HIP  44599, HR  3643, SAO  256582, WDS J17039+1941, WD  0905-724 [9]
Database references
SIMBAD data

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 10.90  AU . [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]

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References

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