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HD 125040 is a visual binary star system in the northern constellation of Boötes. It appears as a dim point of light near the lower limit of perception with the naked eye, having a combined apparent visual magnitude of 6.25.[2] The system is located at a distance of approximately 106 light years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −7 km/s.[4] It has a high proper motion, traversing the celestial sphere at an angular rate of 0.164 arcseconds yr−1.[9]

HD 125040
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 16m 32.84326s[1]
Declination +20° 07′ 18.6591″[1]
Apparent magnitude (V) 6.25[2]
Characteristics
Spectral type F8V[3]
B−V color index +0.488[2]
Astrometry
Radial velocity (Rv)−7.20±0.55[4] km/s
Proper motion (μ) RA: −135.85±0.57[1] mas/yr
Dec.: −93.28±0.46[1] mas/yr
Parallax (π)30.65 ± 0.64 mas[1]
Distance106 ± 2 ly
(32.6 ± 0.7 pc)
Absolute magnitude (MV)3.69±0.05[5]
Orbit[6]
Period (P)956.6±299.4 yr
Semi-major axis (a)3.75±0.75"
(122.3±24.4 AU)
Eccentricity (e)0.53±0.08
Inclination (i)134.3±6.9°
Longitude of the node (Ω)14.1±10.4°
Periastron epoch (T)1683.9±14.2
Argument of periastron (ω)
(secondary)		72.2±18.5°
Details
Mass1.23[7] M☉
Luminosity2.57[7] L☉
Surface gravity (log g)4.28[7] cgs
Temperature6,223[5] K
Metallicity [Fe/H]0.05[5] dex
Rotational velocity (v sin i)38.0[7] km/s
Age2.5+0.6
−0.7[5] Gyr
Other designations
BD+20° 2954, HD 125040, HIP 69751, HR 5346, SAO 83259, WDS J14165+2007AB[8]
Database references
SIMBADdata

This was first reported to be a double by J. F. W. Herschel in 1830. The stars orbit each other with a semi-major axis of 122 AU, a period of roughly 956.6 years, and an eccentricity of 0.53. They have a combined mass about double that of the Sun.[6] The primary component is an F-type main-sequence star with a stellar classification of F8V.[3] The system is a source for X-ray emission.[10]


References


  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600. Vizier catalog entry
  2. Häggkvist, L.; Oja, T. (1969), "Photoelectric BV photometry of 368 northern stars", Arkiv för Astronomi, 5: 125–135, Bibcode:1969ArA.....5..125H.
  3. Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode:1970AJ.....75..165H, doi:10.1086/110956.
  4. Valenti, Jeff A.; Fischer, Debra A. (July 2005), "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs", The Astrophysical Journal Supplement Series, 159 (1): 141–166, Bibcode:2005ApJS..159..141V, doi:10.1086/430500.
  5. 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.
  6. Kiyaeva, O. V.; et al. (May 2017), "New orbits of wide visual double stars", Astronomy Letters, 43 (5): 316–331, Bibcode:2017AstL...43..316K, doi:10.1134/S1063773717040041.
  7. Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
  8. "HD 125040". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-10-02.
  9. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
  10. Schwope, A.; et al. (2000), "The ROSAT Bright Survey: II. Catalogue of all high-galactic latitude RASS sources with PSPC countrate CR > 0.2 s−1", Astronomische Nachrichten, 321 (1): 1–52, arXiv:astro-ph/0003039, Bibcode:2000AN....321....1S, doi:10.1002/(SICI)1521-3994(200003)321:1<1::AID-ASNA1>3.0.CO;2-C.




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