HD 127726
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 32m 20.22613s[1]
Declination +26° 40′ 38.224″[1]
Apparent magnitude (V) 5.88[2] (6.61 + 7.08)[3]
Characteristics
Spectral type A7Vn + F0[4]
U−B color index +0.08[2]
B−V color index +0.21[2]
Astrometry
Radial velocity (Rv)−4[5] km/s
Proper motion (μ) RA: −69.68[1] mas/yr
Dec.: −21.90[1] mas/yr
Parallax (π)13.58 ± 0.69 mas[1]
Distance240 ± 10 ly
(74 ± 4 pc)
Absolute magnitude (MV)2.27 + 2.74[4]
Orbit[6]
Period (P)29.93 yr
Semi-major axis (a)0.200″
Eccentricity (e)0.160
Inclination (i)158.0°
Longitude of the node (Ω)23.3°
Periastron epoch (T)B 1983.85
Argument of periastron (ω)
(secondary)		57.0°
Details
Luminosity16.4[7] L☉
Temperature7,246[7] K
Rotational velocity (v sin i)222[8] km/s
Other designations
BD+27° 2388, HD 127726, HIP 71094, HR 5433, SAO 83394
Database references
SIMBADdata

HD 127726 is a binary star system in the northern constellation of Boötes. The pair consist of a rapidly-rotating A-type main-sequence star and a fainter F-type companion, orbiting each other with a period of 29.93 years and an orbital eccentricity (ovalness) of 0.16. They have a combined apparent visual magnitude of 5.88, which is bright enough to be dimly visible to the naked eye. The system is located at a distance of approximately 240 light years from the Sun.

References

  1. ^ a b c d e 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.
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. ^ a b Cvetkovic, Z.; Ninkovic, S. (2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal, 180 (180): 71–80, Bibcode:2010SerAJ.180...71C, doi:10.2298/SAJ1080071C
  5. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
  6. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 21 May 2017.
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352
  8. ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298

External links


Constellation of Boötes
Categories