14 Ceti

14 Ceti
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Right ascension 00h 35m 32.833s[1]
Declination −00° 30′ 20.20″[1]
Apparent magnitude (V) 5.84[2]
Characteristics
Evolutionary stage Hertzsprung gap[3]
Spectral type F5 V[4][5] or F5 IV[2]
B−V color index 0.444±0.006[6]
Astrometry
Radial velocity (Rv)+11.3±0.2[7] km/s
Proper motion (μ) RA: +143.173 mas/yr[1]
Dec.: −62.295 mas/yr[1]
Parallax (π)17.4181 ± 0.0314 mas[1]
Distance187.3 ± 0.3 ly
(57.4 ± 0.1 pc)
Absolute magnitude (MV)2.26±0.04[8]
Details
Mass1.55±0.1[2] M☉
Radius2.6[2] R☉
Luminosity10.7[2] L☉
Surface gravity (log g)3.87±0.15[9] cgs
Temperature6,583±90[9] K
Metallicity [Fe/H]−0.11±0.06[9] dex
Rotational velocity (v sin i)5[2] km/s
Age2.1±0.4[9] Gyr
Other designations
14 Cet, BD−01° 68, FK5 2036, GC 701, HD 3229, HIP 2787, HR 143, SAO 128843[10]
Database references
SIMBADdata

14 Ceti is a single[11] star in the equatorial constellation of Cetus. It is faintly visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.84.[2] The distance to 14 Ceti can be estimated from its annual parallax shift of 17.4″,[1] which puts it 187 light years away. It is moving further from the Earth with a heliocentric radial velocity of +11 km/s,[7] having recently come no closer than 178 ly.[6]

Gray (1989) as well as Houk and Swift (1999) have this star classified as an F-type main-sequence star with a stellar classification of F5 V.[4][5] However, in the 5th revised edition of the Bright Star Catalogue it was classed by Hoffleit and Warren (1991) as a more evolved subgiant star with a class of F5 IV.[12] The absolute magnitude and effective temperature for this star shows that it is entering the Hertzsprung gap, which is occupied by a class of stars that have consumed the hydrogen at their core but have not yet begun hydrogen fusion along a shell surrounding the center.[11]

Evolutionary models for this star give an estimated age of around 2.1[9] billion years with 1.6[2] times the mass of the Sun. It has 2.6[2] times the Sun's radius and is radiating 10.7[2] times the Sun's luminosity from its photosphere at an effective temperature of about 6,583 K.[9] There is a thin convective envelope near its surface.[2] The star has a lower abundance of elements more massive than helium – what astronomers' term the metallicity – compared to the Sun.[9] The projected rotational velocity is a relatively low 5 km/s, but the rotation rate is unknown since the axial tilt hasn't been determined.[2]

14 Ceti shows an X-ray emission of 0.33×1030 erg s−1, which is on the high side for an F5 star. Both the corona and chromosphere of this star show indications of a magnetic field, and a surface field was detected in 2009 with a strength of −30 G. This made it the only known star between classes F0 and F7 to have a Zeeman effect detected. Two possible explanations for this field are that it is a fast rotator with a dynamo-driven field, or that it is a former Ap star.[11] The activity properties of this star make it more likely to be the latter.[3]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j k l Cite error: The named reference Aurière2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Aurière2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray1989 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  9. ^ a b c d e f g Cite error: The named reference Bensby2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Aurière2012 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Hoffleit1995 was invoked but never defined (see the help page).