Binary star in the constellation Ursa Major
HD 119124
Observation dataEpoch 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] [ 6]
U−B color index
−0.01[ 2]
B−V color index
+0.52[ 2]
Astrometry A Radial velocity (Rv )± 0.3[ 7] Proper motion (μ) RA: ± 0.047[ 1] mas /yr Dec.: ± 0.046[ 1] mas /yr Parallax (π)39.2353 ± 0.0354 mas [ 1] Distance 83.13 ± 0.08 ly pc ) Absolute magnitude (MV )4.30[ 8] B Proper motion (μ) RA: ± 0.044[ 3] mas /yr Dec.: ± 0.049[ 3] mas /yr Parallax (π)39.3513 ± 0.0326 mas [ 3] Distance 82.88 ± 0.07 ly pc ) Details A Mass 1.15[ 9] M ☉ Radius 1.1[ 10] R ☉ Luminosity 1.5[ 10] L ☉ Temperature 6,149[ 11] K Metallicity −0.18[ 11] dex Rotational velocity (v sin i )10.2[ 12] Age ± 22[ 12] Gyr B Mass 0.63[ 9] M ☉ Temperature 4,130[ 13] K Other designations A : BD +51°1859GJ 521.2, HIP 66704, HR 5148, SAO 28836[ 15] B : BD +51°1859 BHIP 66704 B, HR 5148 B, TYC 3469-1423-12MASS J13402450+5030576[ 16] Database references SIMBAD data
HD 119124 is a wide binary star [ 17] circumpolar constellation of Ursa Major . With an apparent visual magnitude of 6.3,[ 2] 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] [ 12] 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] gravitationally bound with an estimated orbital period of around 7,000 years and a linear projected separation of AU [ 17]
The primary, component A, is a Sun-like star [ 10] stellar classification of F8 V,[ 5] 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] variable .[ 19] [ 10] 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
^ 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 .^ 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 . ^ 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 .^ 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 ^ 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 . ^ 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 . ^ 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 . ^ 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 . ^ 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 ^ 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 ^ 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. ^ 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. ^ 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 . ^ "WDS J13404+5031AB" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-14 .^ "HD 119124" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-14 .^ "HD 119124B" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-14 .^ 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. ^ 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 . ^ 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 . ^ 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 .
