FF Andromedae

FF Andromedae

Two light curves for FF Andromedae are shown. The main plot shows the variation in brightness as the star rotates, and the inset plot shows a flare that occurred on 18 October 1991. Adapted from plots in Bopp et al. 1977[1] and Peres et al. 1993.[2]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 42m 48.24949s[3]
Declination +35° 32′ 55.65804″[3]
Apparent magnitude (V) 10.428 variable[4]
Characteristics
Spectral type M1Ve+M1Ve[5]
Apparent magnitude (B) 11.84[6]
Apparent magnitude (V) 10.428[4]
Apparent magnitude (R) 9.941[4]
Apparent magnitude (I) 8.8[7]
Apparent magnitude (G) 9.5526[3]
Apparent magnitude (J) 7.164[8]
Apparent magnitude (H) 6.506[8]
Apparent magnitude (K) 6.321[8]
Variable type BY Dra + Flare
Astrometry
Radial velocity (Rv)−0.47±0.90[9] km/s
Proper motion (μ) RA: 262.064±0.074 [3] mas/yr
Dec.: 77.062±0.109[3] mas/yr
Parallax (π)46.0337 ± 0.0542 mas[3]
Distance70.85 ± 0.08 ly
(21.72 ± 0.03 pc)
Orbit[10]
Period (P)2.17 days
Inclination (i)60°
Details
FF Andromedae A
Mass0.55[11] M☉
Radius0.757[11] R☉
Temperature3,464[11] K
Metallicity [Fe/H]+0.101[11] dex
Rotation2.170 days[12]
Rotational velocity (v sin i)7.8[11] km/s
FF Andromedae B
Mass0.55[11] M☉
Radius0.757[11] R☉
Temperature3,464[11] K
Metallicity [Fe/H]+0.101[11] dex
Rotational velocity (v sin i)6.6[11] km/s
Age55[11] Myr
Other designations
2MASS J00424820+3532554, BD+34 106, HIP 3362, GJ 29.1, TYC 2283-26-1, NLTT 2314, WDS J00428+3533A
Database references
SIMBADdata

FF Andromedae (often abbreviated to FF And) is a spectroscopic binary in the constellation Andromeda. It has a typical apparent visual magnitude of 10.4, but undergoes flare events that can increase its brightness by about a magnitude.

  1. ^ Cite error: The named reference bopp was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference peres was invoked but never defined (see the help page).
  3. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ a b c Cite error: The named reference UCAC4 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference GCVS was invoked but never defined (see the help page).
  6. ^ "FF And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 6, 2018.
  7. ^ Cite error: The named reference USNO-B was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference 2MASS Cat was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference rv was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference glebocki1995 was invoked but never defined (see the help page).
  11. ^ a b c d e f g h i j k Cite error: The named reference Houdebine2009 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Newton2017 was invoked but never defined (see the help page).