Astronomy:HD 127726
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Short description: Binary star system in the constellation Boötes
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 240 ± 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 | |
| Luminosity | 16.4[7] L☉ |
| Temperature | 7,246[7] K |
| Rotational velocity (v sin i) | 222[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 2.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode: 1986EgUBV........0M.
- ↑ Malkov, O. Yu. et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M
- ↑ 4.0 4.1 Cvetkovic, Z.; Ninkovic, S. (2010), "On the Component Masses of Visual Binaries", Serbian Astronomical Journal 180 (180): 71–80, doi:10.2298/SAJ1080071C, Bibcode: 2010SerAJ.180...71C
- ↑ 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 (University of Toronto: International Astronomical Union) 30: p. 57, Bibcode: 1967IAUS...30...57E
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M
- ↑ 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, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R
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