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18 Andromedae

18 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 39m 08.33195s[1]
Declination +50° 28′ 18.2328″[1]
Apparent magnitude (V) 5.350[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9 Ve[4]
B−V color index −0.110[2]
Astrometry
Radial velocity (Rv)+9.9±2.2[5] km/s
Proper motion (μ) RA: −17.222[1] mas/yr
Dec.: −1.739[1] mas/yr
Parallax (π)7.8893 ± 0.1288 mas[1]
Distance413 ± 7 ly
(127 ± 2 pc)
Details
Mass3.09±0.06[3] M☉
Luminosity146.6+14.1
−12.9[3] L☉
Surface gravity (log g)3.632±0.014[2] cgs
Temperature10,351±50[2] K
Rotational velocity (v sin i)183[3] km/s
Other designations
18 And, BD+49° 4180, FK5 3897, HD 222304, HIP 116709, HR 8967, SAO 35642, PPM 42060[6]
Database references
SIMBADdata

18 Andromedae, abbreviated 18 And, is a single[7] star in the northern constellation of Andromeda. 18 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 5.350.[2] The annual parallax shift of 7.9 mas[1] can be used to estimate a distance of 413 light years. It is moving further from the Earth with a heliocentric radial velocity of +10 km/s.[5]

This is a B-type main-sequence star with a stellar classification of B9 Ve,[4] where the 'e' notation indicates this is a Be star. The stellar spectrum of 18 And displays an emission line in the hydrogen Brackett series due to a dense gaseous circumstellar envelope.[4] The star is spinning rapidly with a projected rotational velocity of 183[3] km/s and has about three[3] times the mass of the Sun. It is radiating 147[3] times the Sun's luminosity from its photosphere at an effective temperature of 10,351 K.[2]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Soubiran2016 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Granada2010 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

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