8 Aquilae

8 Aquilae

A blue band light curve for 8 Aquilae, adapted from Machado et al. (2007)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 18h 51m 22.15821s[2]
Declination −03° 19′ 04.2851″[2]
Apparent magnitude (V) 6.08[3]
Characteristics
Spectral type F0 IV[4] or F2 III[5]
U−B color index +0.06[6]
B−V color index +0.299±0.007[7]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)+11.8[3] km/s
Proper motion (μ) RA: +2.019[2] mas/yr
Dec.: −21.411[2] mas/yr
Parallax (π)12.0549 ± 0.0268 mas
Distance270.6 ± 0.6 ly
(83.0 ± 0.2 pc)
Absolute magnitude (MV)1.27[5]
Details
Mass1.60[8] M☉
Radius3.0[2] R☉
Luminosity18.89[7] L☉
Surface gravity (log g)3.88±0.14[8] cgs
Temperature7,395±251[8] K
Metallicity [Fe/H]0.14[5] dex
Rotational velocity (v sin i)105[9] km/s
Age959[8] Myr
Other designations
8 Aql, V1729 Aql, BD−03°4392, FK5 3500, HD 174589, HIP 92524, HR 7101, SAO 142706[10]
Database references
SIMBADdata

8 Aquilae is a star in the equatorial constellation of Aquila,[10] located 271 light years away from the Sun. 8 Aquilae is the Flamsteed designation. It can be viewed with the naked eye in good seeing conditions, appearing as a dim, yellow-white hued star with an apparent visual magnitude of 6.08.[3] The star is moving further from the Earth with a heliocentric radial velocity of +12 km/s.[3]

Abt and Morrell (1995) found a stellar classification of F0 IV[4] for this star, suggesting it is an F-type subgiant. In their 2010 study, Fox Machado et al. assigned a class of F2 III,[5] which matches an evolved giant star. Despite the spectral classifications, evolutionary models place the star towards the end of its main sequence life, with an age of about a billion years.[8][2]

8 Aquilae is a Delta Scuti variable with at least three overlapping pulsation frequencies, although the total amplitude of its brightness variations is only about 0.02 magnitudes.[5] It has a relatively high rotation rate, showing a projected rotational velocity of 105 km/s.[9] It has 1.6[8] times the mass of the Sun and is radiating 19[7] times the Sun's luminosity from its photosphere at an effective temperature of about 7,395 K.[8]

  1. ^ Cite error: The named reference Machado was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference dr3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference scfs was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference na15_5_397 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference mnassa24_120 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aaa393_3_897 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).