Astronomy:HD 125040

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Short description: Visual binary star system in the constellation Boötes
HD 125040
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Boötes[1]
A
Right ascension  14h 16m 32.84325s[2]
Declination +20° 07′ 18.6542″[2]
Apparent magnitude (V) 6.41[3]
B
Right ascension  14h 16m 32.97162s[4]
Declination +20° 07′ 14.6100″[4]
Apparent magnitude (V) 8.33[5]
Characteristics
Spectral type F8V[6]
B−V color index +0.488[7]
Astrometry
Absolute magnitude (MV)3.68[1]
A
Radial velocity (Rv)−6.90±0.47[8] km/s
Proper motion (μ) RA: −135.348[2] mas/yr
Dec.: −95.322[2] mas/yr
Parallax (π)30.2106 ± 0.0226[2] mas
Distance107.96 ± 0.08 ly
(33.10 ± 0.02 pc)
B
Proper motion (μ) RA: −125.557[4] mas/yr
Dec.: −87.056[4] mas/yr
Parallax (π)30.2246 ± 0.0243[4] mas
Distance107.91 ± 0.09 ly
(33.09 ± 0.03 pc)
Orbit[9]
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
A
Mass1.2[2] M☉
Radius1.3[2] R☉
Luminosity2.4[2] L☉
Surface gravity (log g)4.22[2] cgs
Temperature6,326[2] K
Metallicity [Fe/H]−0.31[2] dex
Rotational velocity (v sin i)35.9[10] km/s
Age2.5[2] Gyr
B
Mass0.86[4] M☉
Radius0.81[4] R☉
Luminosity0.42[4] L☉
Surface gravity (log g)4.53[4] cgs
Temperature5,260[4] K
Age5.2[4] Gyr
Other designations
BD+20°2954, HD 125040, HIP 69751, HR 5346, SAO 83259, WDS J14165+2007AB[11]
Database references
SIMBADdata
A
B

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.[7] The system is located at a distance of approximately 106 light years from the Sun based on parallax measurements,[12] but is drifting closer with a radial velocity of −7 km/s.[13] It has a high proper motion, traversing the celestial sphere at an angular rate of 0.164 arcseconds yr−1.[14]

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.[9] The combined spectral type is of an F-type main-sequence star with a stellar classification of F8V;[6] the brighter primary star has a spectral class of F6V.[15] The system is a source for X-ray emission.[16]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355, Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002), "The Tycho double star catalogue", Astronomy and Astrophysics 384: 180, doi:10.1051/0004-6361:20011822, Bibcode: 2002A&A...384..180F. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 Häggkvist, L.; Oja, T. (1969), "Photoelectric BV photometry of 368 northern stars", Arkiv för Astronomi 5: 125–135, Bibcode: 1969ArA.....5..125H. 
  8. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  9. ↑ 9.0 9.1 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. 
  10. ↑ Valenti, Jeff A.; Fischer, Debra A. (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, doi:10.1086/430500, Bibcode: 2005ApJS..159..141V. 
  11. ↑ "HD 125040". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+125040. 
  12. ↑ 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
  13. ↑ 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. 
  14. ↑ 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. 
  15. ↑ Abt, H. A. (1981), "Visual multiples. VII. MK classifications", The Astrophysical Journal Supplement Series 45: 437, doi:10.1086/190719, Bibcode: 1981ApJS...45..437A. 
  16. ↑ 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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