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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
SIMBAD data

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]

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series, 89 (2): 415–419, Bibcode: 1991A&AS...89..415O.
  3. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ a b Mason, B. D.; et al. (December 2001), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466−3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920
  5. ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, arXiv: astro-ph/0603770, Bibcode: 2006AJ....132..161G, doi: 10.1086/504637, S2CID  119476992.
  6. ^ Stephenson, C. B. (January 1986), "Dwarf K and M stars of small proper motion found in a large spectroscopic survey", Astronomical Journal, 91: 144−159, Bibcode: 1986AJ.....91..144S, doi: 10.1086/113994.
  7. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053, Bibcode: 2006AstL...32..759G, doi: 10.1134/S1063773706110065, S2CID  119231169.
  8. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv: 0811.3982, Bibcode: 2009A&A...501..941H, doi: 10.1051/0004-6361/200811191, S2CID  118577511.
  9. ^ a b c Tokovinin, A.; Kiyaeva, O. (2015), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society, 456 (2): 2070, arXiv: 1512.00278, Bibcode: 2016MNRAS.456.2070T, doi: 10.1093/mnras/stv2825.
  10. ^ a b c d e f Chen, C. H.; et al. (December 1, 2005), "A Spitzer Study of Dusty Disks around Nearby, Young Stars", The Astrophysical Journal, 634 (2): 1372–1384, Bibcode: 2005ApJ...634.1372C, doi: 10.1086/497124.
  11. ^ a b c Pace, G. (March 2013), "Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram", Astronomy & Astrophysics, 551: 4, arXiv: 1301.5651, Bibcode: 2013A&A...551L...8P, doi: 10.1051/0004-6361/201220364, S2CID  56420519, L8.
  12. ^ a b c Zuckerman, B.; et al. (November 2013), "Young Stars near Earth: The Octans-Near Association and Castor Moving Group", The Astrophysical Journal, 778 (1): 12, arXiv: 1309.2318, Bibcode: 2013ApJ...778....5Z, doi: 10.1088/0004-637X/778/1/5, S2CID  118446756, 5.
  13. ^ Morales, J. C.; et al. (2008), "The effect of activity on stellar temperatures and radii", Astronomy and Astrophysics, 478 (2): 507−512, arXiv: 0711.3523, Bibcode: 2008A&A...478..507M, doi: 10.1051/0004-6361:20078324, S2CID  16238033.
  14. ^ "WDS J13404+5031AB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
  15. ^ "HD 119124". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
  16. ^ "HD 119124B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
  17. ^ a b Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv: 1401.6827, Bibcode: 2014AJ....147...87T, doi: 10.1088/0004-6256/147/4/87, S2CID  56066740, 87.
  18. ^ Caballero, J. A. (May 2010), "Reaching the boundary between stellar kinematic groups and very wide binaries. II. α Librae + KU Librae: a common proper motion system in Castor separated by 1.0 pc", Astronomy and Astrophysics, 514: A98, arXiv: 1001.5432, Bibcode: 2010A&A...514A..98C, doi: 10.1051/0004-6361/200913986, S2CID  118875432.
  19. ^ Adelman, S. J.; et al. (December 2000), "On the Variability of F1-F9 Luminosity Class III-V Stars", Information Bulletin on Variable Stars, 5003: 1, Bibcode: 2000IBVS.5003....1A.
  20. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv: 0910.3229, Bibcode: 2009ApJS..184..138H, doi: 10.1088/0067-0049/184/1/138, S2CID  119267456.
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