HR 6384

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Template:Short description

HR 6384
File:HR6384LightCurve.png
The visual band light curve of HR 6384, adapted from Walker et al. (1985)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[2]
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 6.153[1]
Characteristics
Evolutionary stage AGB[4]
Spectral type M1/M2II/III + A[5]
U−B Template:Engvar +1.340[1]
B−V Template:Engvar +1.787[1]
Variable type ellipsoidal variable[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[2] km/s
Proper motion (μ) RA: +2.760[3] mas/yr
Dec.: −7.033[3] mas/yr
Parallax (π)2.2407±0.1939 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.20[2]
Details
RadiusScript error: No such module "val".[3] Template:Solar radius
LuminosityScript error: No such module "val".[3] Template:Solar luminosity
TemperatureScript error: No such module "val".[3] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[7]
Database references
SIMBADdata

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HR 6384 is a binary star system in the southern constellation of Ara, the Altar. The system is faintly visible to the naked eye with a combined apparent visual magnitude that fluctuates around 6.153,[1] and it is located at a distance of approximately Script error: No such module "convert". from the Sun.[3] It is drifting closer with a radial velocity of around −34 km/s.[2]

In 1985, W. S. G. Walker et al. announced that HR 6384 is a variable star, based on three color photometry undertaken at Auckland Observatory in New Zealand.[8] It was given its variable star designation, V829 Arae, in 1987.[9]

The system appears to be a close, interacting binary with a hot secondary component of class A or hotter.[10] It forms a suspected ellipsoidal variable[6] with a period of 80 days and an amplitude variation of 0.08 in magnitude.[11] The primary component is an aging red giant/bright giant with a stellar classification of M1/M2II/III,[5] currently on the asymptotic giant branch.[4] With the supply of hydrogen at its core exhausted, it has expanded to 160 times the girth of the Sun. It is radiating 3,562 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,562 K.[3]

References

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

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External links

Template:Stars of Ara

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