Astronomy:HD 127726
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Short description: Binary star system in the constellation Boötes
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 32m 20.22613s[2] |
| Declination | +26° 40′ 38.224″[2] |
| Apparent magnitude (V) | 5.88[3] (6.61 + 7.08)[4] |
| Characteristics | |
| Spectral type | A7Vn + F0[5] |
| U−B color index | +0.08[3] |
| B−V color index | +0.21[3] |
| Astrometry | |
| Radial velocity (Rv) | −4[6] km/s |
| Proper motion (μ) | RA: −69.68[2] mas/yr Dec.: −21.90[2] mas/yr |
| Parallax (π) | 13.58 ± 0.69[2] mas |
| Distance | 240 ± 10 ly (74 ± 4 pc) |
| Absolute magnitude (MV) | 2.27 + 2.74[5] |
| Orbit[7] | |
| 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 | |
| A | |
| Mass | 1.64[8] M☉ |
| Rotational velocity (v sin i) | 205[9] km/s |
| B | |
| Mass | 1.46[8] M☉ |
| 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.
A third star, 4.26" from HD 127726 and magnitude 6.0, shares a common proper motion although any orbit would be thousands of years long.[10][8]
References
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data.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
- ↑ 5.0 5.1 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.
- ↑ 8.0 8.1 8.2 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T.
- ↑ Abt, Helmut A.; Boonyarak, Chayan (2004). "Tidal Effects in Binaries of Various Periods". The Astrophysical Journal 616 (1): 562. doi:10.1086/423795. Bibcode: 2004ApJ...616..562A.
- ↑ 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.
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