HD 119124

HD 119124
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
A
Right ascension 13h 40m 23.2324s[1]
Declination +50° 31′ 09.8962″[1]
Apparent magnitude (V) 6.32[2]
B
Right ascension 13h 40m 24.5190s[3]
Declination +50° 30′ 57.5709″[3]
Apparent magnitude (V) 10.51[4]
Characteristics
Spectral type F8 V[5] + K7[6]
U−B color index −0.01[2]
B−V color index +0.52[2]
Astrometry
A
Radial velocity (Rv)−12.2±0.3[7] km/s
Proper motion (μ) RA: −125.728±0.047[1] mas/yr
Dec.: 58.567±0.046[1] mas/yr
Parallax (π)39.2353 ± 0.0354 mas[1]
Distance83.13 ± 0.08 ly
(25.49 ± 0.02 pc)
Absolute magnitude (MV)4.30[8]
B
Proper motion (μ) RA: −131.130±0.044[3] mas/yr
Dec.: 59.299±0.049[3] mas/yr
Parallax (π)39.3513 ± 0.0326 mas[3]
Distance82.88 ± 0.07 ly
(25.41 ± 0.02 pc)
Details
A
Mass1.15[9] M☉
Radius1.1[10] R☉
Luminosity1.5[10] L☉
Temperature6,149[11] K
Metallicity [Fe/H]−0.18[11] dex
Rotational velocity (v sin i)10.2[12] km/s
Age2.06±22[12] Gyr
B
Mass0.63[9] M☉
Temperature4,130[13] K
Other designations
STF 1774, HD 119124, ADS 8992, CCDM J13404+5031, WDS J13404+5031[14]
A: BD+51°1859, GJ 521.2, HIP 66704, HR 5148, SAO 28836[15]
B: BD+51°1859 B, HIP 66704 B, HR 5148 B, TYC 3469-1423-1, 2MASS J13402450+5030576[16]
Database references
SIMBADdata

HD 119124 is a wide binary star[17] system in the circumpolar constellation of Ursa Major. With an apparent visual magnitude of 6.3,[2] it lies below the normal brightness limit of stars that are visible with the naked eye under most viewing conditions. An annual parallax shift of 39.24[1] mas for the A component provides a distance estimate of 83 light years. The pair are candidate members of the Castor Moving Group,[18] which implies a relatively youthful age of around 200 million years.[12] HD 119124 is moving closer to the Sun with a radial velocity of −12 km/s.[7]

This system was first identified as a double star by Friedrich von Struve (1793−1864) and catalogued as the 1774th entry in his list. As of 2015, the magnitude 10.5 K-type companion star was located at an angular separation of 18.10 arc seconds along a position angle of 135° from the brighter primary.[4] They appear to be gravitationally bound with an estimated orbital period of around 7,000 years and a linear projected separation of 444.6 AU.[17]

The primary, component A, is a Sun-like star[10] with a stellar classification of F8 V,[5] indicating it is an F-type main-sequence star that is generating energy via hydrogen fusion at its core. It is slightly larger and more massive than the Sun[10][9] and appears mildly variable.[19] The star is radiating 1.5[10] times the Sun's luminosity from its photosphere at an effective temperature of 6,149 K.[11]

HD 119124 A displays a strong infrared excess at a wavelength of 70 μm, indicating an orbiting circumstellar disk of cold dust. The emission fits a model with a grain temperature of 40 K, indicating a minimum orbital radius of 60 AU from the host star. The estimated grain lifetimes are 84,000 years – much shorter than the star's lifespan. This suggests the grains are being replenished via collisions between some number of larger bodies totaling around 1−6 times the mass of the Moon.[10]

This system is a likely (80.4% chance) source of the strong X-ray emission coming from these coordinates.[20]

  1. ^ a b c d e f Cite error: The named reference Gaia DR2 for A was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Oja1991 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Gaia DR2 for B was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Stephenson1986 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 Cite error: The named reference Tokovinin2015 was invoked but never defined (see the help page).
  10. ^ a b c d e f Cite error: The named reference Chen2005 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Pace2013 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference Zuckerman2013 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Morales2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference simbad was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference simbad for A was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference simbad for B was invoked but never defined (see the help page).
  17. ^ a b Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Caballero2010 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Adelman2000 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).