Astronomy:1 Boötis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Lutz, T. E.; Lutz, J. H. (June 1977), "Spectral classification and UBV photometry of bright visual double stars", Astronomical Journal 82: 431–434, doi:10.1086/112066, Bibcode: 1977AJ.....82..431L
- ↑ 3.0 3.1 3.2 3.3 3.4 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 4.2 4.3 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
- ↑ 5.0 5.1 Evans, D. S. (June 24, 1966). "The Revision of the General Catalogue of Radial Velocities". in Batten, Alan Henry; Heard, John Frederick. University of Toronto: International Astronomical Union. Bibcode: 1967IAUS...30...57E.
- ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 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, doi:10.1051/0004-6361:20010452, Bibcode: 2001A&A...372..152H
- ↑ "1 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=1+Boo.
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