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38 Lyncis

38 Lyncis
Location of 38 Lyncis (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 09h 18m 50.64384s[1]
Declination +36° 48′ 09.3331″[1]
Apparent magnitude (V) 3.82[2] (3.95 + ? + 6.30)[3]
Characteristics
Spectral type A3V[4] (A1V + A4V)[5]
B−V color index 0.066±0.010[2]
Astrometry
Radial velocity (Rv)4.0±2.7[2] km/s
Absolute magnitude (MV)+0.98[6]
A
Proper motion (μ) RA: –36.288[7] mas/yr
Dec.: −121.767[7] mas/yr
Parallax (π)27.8044 ± 0.7879 mas[7]
Distance117 ± 3 ly
(36 ± 1 pc)
B
Proper motion (μ) RA: –26.513[8] mas/yr
Dec.: −127.261[8] mas/yr
Parallax (π)24.4730 ± 0.1240 mas[8]
Distance133.3 ± 0.7 ly
(40.9 ± 0.2 pc)
Details
38 Lyn A
Mass1.90[9] M☉
Radius3.07[10] R☉
Luminosity32[6] L☉
Surface gravity (log g)3.86[9] cgs
Temperature8,862±301[9] K
Metallicity [Fe/H]−0.36[11] dex
Rotational velocity (v sin i)163[11] km/s
Age213[9] Myr
38 Lyn B
Mass1.30/0.90[12] M☉
Radius2.55[8] R☉
Luminosity5[8] L☉
Temperature5,409[8] K
Other designations
38 Lyn, BD+37°1965, FK5 346, HD 80081, HIP 45688, HR 3690, SAO 61391, WDS J09188+3648[13]
Database references
SIMBADdata
A
B

38 Lyncis is a multiple star system in the northern constellation of Lynx. It located about 125 light-years from the Sun, based on parallax.

When viewed through a moderate telescope, two components—a brighter blue-white star of magnitude 3.9 and a fainter star of magnitude 6.1 that has been described as lilac as well as blue-white—can be seen.[14] The pair have an angular separation of 2.6″ and an estimated period of 429 years.[12] The fainter component is itself a close binary which can only be resolved using speckle interferometry. The two were separated by 0.06″ in 1993[15] and 0.237″ in 2008,[16] and have an estimated orbital period of 2.1 years.[12] A further faint star, component E 100″ away, is a proper-motion companion.[17][18] Two other faint companions listed in multiple star catalogues as components C and D are unrelated background objects.[19][20]

38 Lyncis was given as a standard star for the spectral class of A3 V when the Morgan-Keenan classification system was first defined in 1943, apparently for the two components combined.[21]

The primary star, component A, is a class A main sequence star around twice the mass of the sun. An effective temperature of 8,862 K and a radius of 3.09 R☉ mean that it is over thirty times more luminous than the sun. It has been listed as a λ Boötis star, although it is no longer considered to be a member.[6] The fainter of the pair, component B, has been given a spectral class of A4V, although it consists of two very close stars. Their properties are poorly-known, even the difference in their apparent magnitudes can only be estimated to be approximately 2. Based on this, their masses are estimated to be 1.3 M☉ and 0.9 M☉ respectively.[12] Component E is a 15th magnitude star with an approximate spectral type of M2, a red dwarf, and an estimated mass of 0.31 M☉,[12] and a temperature of 3,816 K.[18]

  1. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference palmer was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference murphy was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference dr2a was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference dr2b was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference gaspar was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference takeda was invoked but never defined (see the help page).
  12. ^ a b c d e Cite error: The named reference msc 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 Monks2010 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference mcalister was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference hartkopf was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference vast was invoked but never defined (see the help page).
  18. ^ a b Cite error: The named reference dr2e was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference wds was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference ccdm was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference mkk was invoked but never defined (see the help page).
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