8 Aquilae

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8 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 18h 51m 22.15786s[1]
Declination –03° 19′ 04.2836″[1]
Apparent magnitude (V) 6.08[2]
Characteristics
Spectral type F2 III[3]
U−B color index +0.06[4]
B−V color index +0.30[4]
Variable type δ Sct type[5]
Astrometry
Radial velocity (Rv) +11.8[2] km/s
Proper motion (μ) RA: +1.12[1] mas/yr
Dec.: –21.35[1] mas/yr
Parallax (π) 12.72 ± 0.37 mas
Distance 256 ± 7 ly
(79 ± 2 pc)
Absolute magnitude (MV) 1.27[5]
Details
Surface gravity (log g) 3.51[5] cgs
Temperature 7,051[5] K
Metallicity [Fe/H] 0.14[5] dex
Rotational velocity (v sin i) 105[6] km/s
Other designations
BD-03 4392, FK5 3500, HD 174589, HIP 92524, HR 7101, SAO 142706.[3]

8 Aquilae is the Flamsteed designation for a star in the equatorial constellation of Aquila. It has an apparent visual magnitude of 6.08[2] and is about 256 light-years (78 parsecs) distant from the Earth.[1] This is a delta scuti variable with at least three overlapping pulsation frequencies.[5] It is an F-type giant star with a stellar classification of F2 III.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Wielen, R. et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W. 
  3. ^ a b c "8 Aql -- Variable Star of delta Sct type", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-25. 
  4. ^ a b Cousins, A. W. J. (1965), "Photometric Data for Stars in the Equatorial Zone (Eighth List)", Monthly Notes of the Astronomical Society of Southern Africa 24: 120, Bibcode:1965MNSSA..24..120C. 
  5. ^ a b c d e f Fox Machado, L. et al. (July 2010), "Strömgren photometry and spectroscopy of the δ Scuti stars 7 Aql and 8 Aql", New Astronomy 15 (5): 397–402, arXiv:0912.2808, Bibcode:2010NewA...15..397F, doi:10.1016/j.newast.2009.11.006. 
  6. ^ Royer, F. et al. (2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere", Astronomy and Astrophysics 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943. 

External links[edit]