Pi Arae

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Template:Short description

Pi Arae
Template:Location mark
Location of π Arae (dot within red circle)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ara[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.25[3]
Characteristics
Spectral type A5 IV-V[4]
B−V Template:Engvar +0.20[3]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[2] km/s
Proper motion (μ) RA: −50.775 mas/yr[2]
Dec.: −149.745 mas/yr[2]
Parallax (π)24.3817±0.0805 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+2.01[1]
Details
Mass1.73[5] Template:Solar mass
Radius1.90[6] Template:Solar radius
Luminosity13.3[1] Template:Solar luminosity
Surface gravity (log g)4.36[5] cgs
TemperatureScript error: No such module "val".[5] K
Metallicity [Fe/H]+0.13[1] dex
Rotational velocity (v sin i)Script error: No such module "val".[7] km/s
Age319[5] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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Pi Arae is a star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from π Arae, and abbreviated Pi Ara or π Ara. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.25.[3] Based upon an annual parallax shift of 24.38 mas as seen from Earth,[2] it is located Script error: No such module "convert". from the Sun. It is moving closer to the Sun with a radial velocity of −2 km/s.[2]

The stellar classification of this star is A5 IV-V,[4] indicating the spectrum displays the hybrid features of both a main sequence and a more evolved subgiant star. Pi Arae is an estimated 319[5] million years old and is spinning with a projected rotational velocity of 54.1 km/s.[7] The star has 1.73[5] times the mass of the Sun and 1.90[6] times the Sun's radius. It is radiating 13.3[1] times the Sun's luminosity from its photosphere at an effective temperature of about 8,215 K.[5]

Pi Arae displays an excess emission of infrared radiation, which may be explained by circumstellar dust.[9] The thermal emission matches a two component model, consisting of an inner disk of warm crystalline silicate dust and an outer colder disk of dirty ice. The inner disk has a temperature of 173 K and is orbiting roughly 9.1 AU from the host star. The outer disk is 77 K and orbits at a distance of about 117.3 AU. The small size of some of the dust grains indicate the inner disk may have formed relatively recently from collisions between orbiting planetesimals.[10]

Located 55 arc minutes to the north of Pi Arae is the globular cluster NGC 6397.[11]

References

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  1. ↑ a b c d e Script error: No such module "citation/CS1".
  2. ↑ a b c d e f g Template:Cite Gaia DR3
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b c d e f g Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ Template:Cite simbad
  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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