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40 Persei

This article is about o Persei. Not to be confused with ο (omicron) Persei.
40 Persei
Location of 40 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 42m 22.64555s[1]
Declination 33° 57′ 54.0893″[1]
Apparent magnitude (V) 4.97[2]
Characteristics
Spectral type B0.5V[3] + A1Vn[4]
U−B color index −0.84[5]
B−V color index +0.00[5]
Astrometry
Radial velocity (Rv)+22.00[6] km/s
Proper motion (μ) RA: +2.71[1] mas/yr
Dec.: −5.91[1] mas/yr
Parallax (π)3.09 ± 0.21 mas[1]
Distance1,060 ± 70 ly
(320 ± 20 pc)
Absolute magnitude (MV)−2.26[2]
Details
40 Per A
Mass12.5[7] M☉
Luminosity936[2] L☉
Surface gravity (log g)4.36[8] cgs
Temperature29,330[9] K
Metallicity [Fe/H]−0.43[2] dex
Rotational velocity (v sin i)10[10] km/s
Age7.2[11] Myr
Other designations
40 Per, BD+33°698, GC 4420, HD 22951, HIP 17313, HR 1123, SAO 56646, CCDM J03424+3358A, WDS J03424+3358A[12]
Database references
SIMBADdata

40 Persei is a wide binary star[13] system in the northern constellation of Perseus. It has the Bayer designation ο Persei, while 40 Persei is the Flamsteed designation. The system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.97.[2] It is located approximately 1060 light years away from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[6] The system is a member of the Perseus OB2 association of co-moving stars.[14]

The primary component is a massive B-type main-sequence star with a stellar classification of B0.5V.[3] It is about 7.2[11] million years old and has a very low projected rotational velocity for an early B-type star,[15] measured at 10 km/s.[10] This star has 12.5[7] times the mass of the Sun and is radiating 936[2] times the Sun's luminosity from its photosphere at an effective temperature of 29,330 K.[9] The companion is magnitude 10.04, A-type main-sequence star with a class of A1Vn, and is located at an angular separation of 19.8″ from the primary.[4]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference XHIP was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Hoffleit1991 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference WDS was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Mallama2014 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Soubiran2016 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Zorec2009 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Seyfert1960 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Lesh1969 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Guthrie1984 was invoked but never defined (see the help page).
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