21 Aquilae

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Template:Short description

21 Aquilae
File:V1288AqlLightCurve.png
An ultraviolet band light curve for V1288 Aquilae, adapted from Veto (1980)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.06 - 5.16[3]
Characteristics
Spectral type B8II-III(Hg?)[4]
U−B Template:Engvar −0.399[5]
B−V Template:Engvar −0.065[5]
Variable type α2 CVn[3]
Astrometry
Radial velocity (Rv)−5.2[6] km/s
Proper motion (μ) RA: +10.102[2] mas/yr
Dec.: −0.825[2] mas/yr
Parallax (π)4.7730±0.1052 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.12[7]
Details
Mass6.7[8] Template:Solar mass
Radius6.2[9] Template:Solar radius
Luminosity704[8] Template:Solar luminosity
Surface gravity (log g)3.95[8] cgs
Temperature12,014[8] K
Metallicity [Fe/H]−0.20[10] dex
RotationScript error: No such module "val".[11]
Rotational velocity (v sin i)17[10] km/s
Age165[12] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[13]
Database references
SIMBADdata

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21 Aquilae is a solitary[14] variable star in the equatorial constellation of Aquila. It has the variable star designation V1288 Aql; 21 Aquilae is its Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of about 5.1. The star is located at a distance of around Script error: No such module "convert". from Earth, give or take a 20 light-year margin of error. It is moving closer to the Earth with a heliocentric radial velocity of –5 km/s.[6]

In 1962, Helmut A. Abt and John C. Gloson published data showing that 21 Aquilae was a variable star.[15] Based on that publication, the star was given its variable star designation in 1972.[16]

The stellar classification of this star is B8 II-III, with the luminosity class of II-III suggesting that the spectrum displays elements of both a giant star and a bright giant. It is a chemically peculiar star of the Mercury-Manganese type (CP3),[10] although some catalogues consider that status to be doubtful.[17] This is a probable Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.06 down to 5.16.[3] The star is radiating 704 times the luminosity of the Sun from its photosphere at an effective temperature of Script error: No such module "val".; this gives it the blue-white glow of a B-type star.[18]

21 Aquilae is catalogued as an optical double star, having a 12th magnitude companion Script error: No such module "val". away as of 2010. It was first identified as a double star by John Herschel.[19] The companion is a distant background object.[20]

References

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  2. ↑ a b c d e Template:Cite DR3
  3. ↑ a b c Script error: No such module "Citation/CS1".
  4. ↑ 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. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b c d Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Template:Cite simbad
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Template:Cite Gaia DR3

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External links

Template:Stars of Aquila

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