V1291 Aquilae

V1291 Aquilae

A light curve for V1291 Aquilae, adapted from Mikulásek et al. (2003)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 53m 18.73574s[2]
Declination −03° 06′ 52.0653″[2]
Apparent magnitude (V) 5.65[3] (5.61 to 5.67)[4]
Characteristics
Evolutionary stage Main sequence[5]
Spectral type F0VpSrCrEu[5]
U−B color index +0.10[3]
B−V color index +0.20[3]
Variable type α2 CVn[4]
Astrometry
Radial velocity (Rv)−21.850±0.0005[2] km/s
Proper motion (μ) RA: +21.578[2] mas/yr
Dec.: +14.186[2] mas/yr
Parallax (π)11.7248 ± 0.1011 mas[2]
Distance278 ± 2 ly
(85.3 ± 0.7 pc)
Details[6]
Mass2.26±0.05[7] M☉
Radius2.32±0.19 R☉
Luminosity25.7+2.3
−1.8 L☉
Surface gravity (log g)4.03±0.08 cgs
Temperature8,770±30[7] K
Metallicity [Fe/H]1.00[8] dex
Rotational velocity (v sin i)6.7±0.5 km/s
Age670±210 Myr
Other designations
V1291 Aql, BD−03°4742, HD 188041, HIP 97871, HR 7575, SAO 143883[9]
Database references
SIMBADdata

V1291 Aquilae is a single[10] star in the equatorial constellation of Aquila. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.65.[3] Based on parallax measurements, it is located at a distance of approximately 278 light years from the Sun. The star it is drifting closer with a radial velocity of −22 km/s.[2]

This is a magnetic chemically peculiar star, or Ap star, with a stellar classification of F0VpSrCrEu,[5] matching an F-type main-sequence star with abundance anomalies of strontium, chromium, and europium in the spectrum. It is a variable star of type Alpha2 Canum Venaticorum that ranges in visual magnitude from 5.61 down to 5.67[4] with a period of 223.826 days. This is most likely the mean rotational period of the star.[1] V1291 Aquilae was one of the first Ap stars discovered with a period of more than 100 days.[11] It shows a surface magnetic field strength of 3.6 kG.[7]

  1. ^ a b Cite error: The named reference Mikulásek2003 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Sikora2019 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Romanovskaya2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference prugniel was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Adelman2007 was invoked but never defined (see the help page).