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] |
| Distance | 106 ± 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 | |
| Mass | 1.23[7] M☉ |
| Luminosity | 2.57[7] L☉ |
| Surface gravity (log g) | 4.28[7] cgs |
| Temperature | 6,223[5] K |
| Metallicity [Fe/H] | 0.05[5] dex |
| Rotational velocity (v sin i) | 38.0[7] km/s |
| Age | 2.5+0.6 −0.7[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
[edit]- ^ a b c d e f 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
- ^ a b c Häggkvist, L.; Oja, T. (1969), "Photoelectric BV photometry of 368 northern stars", Arkiv för Astronomi, 5: 125–135, Bibcode:1969ArA.....5..125H.
- ^ a b 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.
- ^ a b 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.
- ^ a b c d 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 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, S2CID 255196353.
- ^ a b c d 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.
- ^ "HD 125040". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-10-02.
- ^ 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.
- ^ 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.
External links
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