HR 6384

HR 6384

The visual band light curve of HR 6384, adapted from Walker et al. (1985)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 14m 13.40536s[2]
Declination –56° 53′ 18.6897″[2]
Apparent magnitude (V) 6.153[1]
Characteristics
Spectral type M1/M2II/III + A[3]
U−B color index +1.340[1]
B−V color index +1.787[1]
Variable type ellipsoidal variable[4]
Astrometry
Radial velocity (Rv)−34.0±4.0[5] km/s
Proper motion (μ) RA: 2.760[2] mas/yr
Dec.: –7.033[2] mas/yr
Parallax (π)2.2407 ± 0.1939 mas[2]
Distance1,500 ± 100 ly
(450 ± 40 pc)
Absolute magnitude (MV)−2.20[5]
Details
Radius160.39+9.31
−23.02[2] R☉
Luminosity3,732±368[2] L☉
Temperature3,562+287
−99[2] K
Other designations
V829 Ara, CD–56°6744, HD 155341, HIP 84311, HR 6384, SAO 244539[6]
Database references
SIMBADdata

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 1,300 light-years (400 parsecs) from the Sun.[2] It is drifting closer with a radial velocity of around −34 km/s.[5]

The system appears to be a close, interacting binary with a hot secondary component of class A or hotter.[7] It forms a suspected ellipsoidal variable[4] with a period of 80 days and an amplitude variation of 0.08 in magnitude.[8] The primary component is an aging red giant/bright giant with a stellar classification of M1/M2II/III,[3] currently on the asymptotic giant branch.[9] 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.[2]

  1. ^ a b c d e Cite error: The named reference ibvs2775 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 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 Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Ake1985 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference jaavso24_2_105 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).