HD 27322

HD 27322
Location of HD 27322 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 04h 21m 51.80623s[1]
Declination +56° 30′ 22.7351″[1]
Apparent magnitude (V) 5.92±0.01[2]
Characteristics
Evolutionary stage main sequence star[3]
Spectral type A3 V[4] or A2 IV-V[5]
U−B color index +0.08[6]
B−V color index +0.11[6]
Astrometry
Radial velocity (Rv)−13±5[7] km/s
Proper motion (μ) RA: −14.793 mas/yr[1]
Dec.: +7.466 mas/yr[1]
Parallax (π)10.4168 ± 0.0907 mas
Distance313 ± 3 ly
(96.0 ± 0.8 pc)
Absolute magnitude (MV)+0.98[8]
Details
A
Mass1.9±0.1[9] M☉
Radius2.64+0.11
−0.10[10] R☉
Luminosity54.7+1.0
−0.9[1] L☉
Surface gravity (log g)3.88±0.14[11] cgs
Temperature8,414+176
−173[3] K
Metallicity [Fe/H]−0.25[12] dex
Rotational velocity (v sin i)130±8[5] km/s
Age640[11] Myr
B
Mass1.30±0.04[9] M☉
Temperature6,492±109[9] K
Metallicity [Fe/H]−0.50[9] dex
Rotational velocity (v sin i)20[9] km/s
Other designations
AG+56°463, BD+56°509, GC 5253, HD 27322, HIP 20380, HR 1342, SAO 24563[13]
Database references
SIMBADdata

HD 27322, also known as HR 1342, is a binary star located in the northern circumpolar constellation Camelopardalis. The visible component is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.92.[2] The object is located relatively close at a distance of 313 light-years based on Gaia DR3 parallax measurements,[1] and it is drifting closer with a heliocentric radial velocity of approximately −13 km/s.[7] At its current distance, HD 27322's brightness is diminished by 0.24 magnitudes due to interstellar extinction[14] and it has an absolute magnitude of +0.98.[8]

HD 27322 A has a stellar classification of A3 V,[4] indicating that it is an ordinary A-type main-sequence star that is generating energy via hydrogen fusion at its core. Abt & Morell (1995) gave a hotter and slightly more evolved classification of A2 IV-V,[5] indicating that it is an A-type star with a luminosity class intermediate between a main sequence star and a subgiant. At the age of 640 million years,[11] HD 27322 A has completed 79.5% of its main sequence lifetime.[3] It has 1.9 times the mass of the Sun[9] and 2.64 times the radius of the Sun.[10] It radiates 54.7 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 8,414 K.[3] HD 27322 A is metal deficient with an iron abundance 56% that of the Sun's ([Fe/H] = −0.25)[12] and it spins rapidly with a projected rotational velocity of 130 km/s.[5]

The object was generally classified as a solitary star.[15] However, evidence of HD 27322 being a binary first arose when an X-ray emission with a luminosity of 3.22×1020 W was detected around the star.[16] A-type stars are expected to be X-ray quiet, so it might be coming from a hidden companion. A 2016 spectroscopic survey detected a companion around HD 27322.[9] It has 1.3 times the mass of the Sun and it has an effective temperature of 6,492 K.[9] HD 27322 B is metal deficient with a [Fe/H] of −0.5 and it spins modestly with a projected rotational velocity of 20 km/s.[9]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Oja1991 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Guetter1984 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. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d e f g h i Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Schröder2007 was invoked but never defined (see the help page).