1 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 40m 40.46926s[1] |
| Declination | +19° 57′ 20.5839″[1] |
| Apparent magnitude (V) | 5.71[2] (5.78 + 9.60)[3] |
| Characteristics | |
| Spectral type | A1 V[4] + Am[3] |
| U−B color index | +0.02[2] |
| B−V color index | +0.02[2] |
| Astrometry | |
| Radial velocity (Rv) | −26[5] km/s |
| Proper motion (μ) | RA: −46.759[1] mas/yr Dec.: +23.302[1] mas/yr |
| Parallax (π) | 10.2412 ± 0.0898 mas[1] |
| Distance | 318 ± 3 ly (97.6 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.79[6] |
| Details | |
| 1 Boö A | |
| Mass | 2.54 ± 0.09[6] M☉ |
| Luminosity | 56[6] L☉ |
| Temperature | 9,863[6] K |
| Rotational velocity (v sin i) | 60[4] km/s |
| Age | 323[6] Myr |
| 1 Boö B | |
| Mass | 1.02[6] M☉ |
| Luminosity | 0.76[6] L☉ |
| Temperature | 5,370[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
1 Boötis (1 Boo) is a binary star[3] 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.[2] 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.[5]
The magnitude 5.78[3] primary component is an A-type main-sequence star with a stellar classification of A1 V.[4] This star has 2.5[6] times the mass of the Sun and is radiating 56[6] times the Sun's luminosity from its photosphere at an effective temperature of 9,863 K.[6] It is 323[6] million years old and is spinning with a projected rotational velocity of 60 km/s.[4]
The system is a source for X-ray emission, which is most likely coming from the companion star. This magnitude 9.60[3] 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.[6]
References[edit]
- ^ a b c d e 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.
- ^ a b c d 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
- ^ a b c d e 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.
- ^ a b c d 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
- ^ a b 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
- ^ a b c d e f g h i j k l m 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.
