Astronomy:HD 125040
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 astronomical unit|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 astronomical unit|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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V, http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Häggkvist, L.; Oja, T. (1969), "Photoelectric BV photometry of 368 northern stars", Arkiv för Astronomi 5: 125–135, Bibcode: 1969ArA.....5..125H.
- ↑ 3.0 3.1 Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal 75 (2): 165–166, doi:10.1086/110956, Bibcode: 1970AJ.....75..165H.
- ↑ 4.0 4.1 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, doi:10.1086/430500, Bibcode: 2005ApJS..159..141V.
- ↑ 5.0 5.1 5.2 5.3 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, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H.
- ↑ 6.0 6.1 Kiyaeva, O. V. et al. (May 2017), "New orbits of wide visual double stars", Astronomy Letters 43 (5): 316–331, doi:10.1134/S1063773717040041, Bibcode: 2017AstL...43..316K.
- ↑ 7.0 7.1 7.2 7.3 Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal 153 (1): 19, doi:10.3847/1538-3881/153/1/21, 21, Bibcode: 2017AJ....153...21L.
- ↑ "HD 125040". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125040.
- ↑ 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, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
- ↑ 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, doi:10.1002/(SICI)1521-3994(200003)321:1<1::AID-ASNA1>3.0.CO;2-C, Bibcode: 2000AN....321....1S.
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