| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13 40 40.46926 |
| Declination | +19° 57′ 20.5839″ |
| Apparent magnitude (V) | 5.71 (5.78 + 9.60) |
| Characteristics | |
| Spectral type | A1 V + Am |
| U−B color index | +0.02 |
| B−V color index | +0.02 |
| Astrometry | |
| Radial velocity (Rv) | −26 km/s |
| Proper motion (μ) | RA: −46.759 mas/yr Dec.: +23.302 mas/yr |
| Parallax (π) | 10.2412 ± 0.0898 mas |
| Distance | 318 ± 3 ly (97.6 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.79 |
| Details | |
| 1 Boö A | |
| Mass | 2.54 ± 0.09 M☉ |
| Luminosity | 56 L☉ |
| Temperature | 9,863 K |
| Rotational velocity (v sin i) | 60 km/s |
| Age | 323 Myr |
| 1 Boö B | |
| Mass | 1.02 M☉ |
| Luminosity | 0.76 L☉ |
| Temperature | 5,370 K |
| Other designations | |
| BD+20°2858, HD 119055, HIP 66727, HR 5144, SAO 82942, CCDM J13407+1958, WDS J13407+1957 | |
| Database references | |
| SIMBAD | data |
1 Boötis (1 Boo) is a binary star system in the northern constellation of Boötes, located 318 light years away from the Sun. It is visible to the naked eye as a dim, white-hued star with a combined apparent visual magnitude of 5.71. The pair had an angular separation of 4.660″ as of 2008. It is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.
The magnitude 5.78 primary component is an A-type main-sequence star with a stellar classification of A1 V. This star has 2.5 times the mass of the Sun and is radiating 56 times the Sun's luminosity from its photosphere at an effective temperature of 9,863 K. It is 323 million years old and is spinning with a projected rotational velocity of 60 km/s.
The system is a source for X-ray emission, which is most likely coming from the companion star. This magnitude 9.60 component is a possible pre-main sequence star with a mass similar to the Sun. It is radiating 76% of the Sun's luminosity at an effective temperature of 6,370 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Lutz, T. E.; Lutz, J. H. (June 1977), "Spectral classification and UBV photometry of bright visual double stars", Astronomical Journal, 82: 431–434, Bibcode:1977AJ.....82..431L, doi:10.1086/112066
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ 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
- ^ Evans, D. S. (June 24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 (June 20–24), University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E
- ^ Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452, S2CID 17507782
- "1 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-01.
