Astronomy:40 Boötis
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Short description: Star in the constellation Boötes
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 59m 36.94745s[1] |
| Declination | +39° 15′ 55.1994″[1] |
| Apparent magnitude (V) | 5.64[2] |
| Characteristics | |
| Evolutionary stage | giant[3] |
| Spectral type | F1 III–IV[4] |
| B−V color index | 0.336±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +12.3±0.7[5] km/s |
| Proper motion (μ) | RA: −32.109[1] mas/yr Dec.: 41.246[1] mas/yr |
| Parallax (π) | 19.5911 ± 0.0702[1] mas |
| Distance | 166.5 ± 0.6 ly (51.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.08[2] |
| Details | |
| Mass | 1.47[6] M☉ |
| Radius | 2.35+0.34 −0.13[1] R☉ |
| Luminosity | 11.585±0.054[1] L☉ |
| Surface gravity (log g) | 3.88[6] cgs |
| Temperature | 7,070±240[6] K |
| Metallicity [Fe/H] | −0.29[5] dex |
| Rotational velocity (v sin i) | 72.5[3] km/s |
| Age | 1.166[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
40 Boötis is a single[8] star located 166.5 light years away from the Sun in the northern constellation of Boötes. It is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.64.[2] The star is moving away from the Earth with a heliocentric radial velocity of +12 km/s.[5]
The Hipparcos catalogue (1997) lists a stellar classification of F1 III–IV,[9] matching the luminosity class of an aging star that is evolving into a giant.[3] Earlier, Cowley and Bidelman (1979) listed a class of F2 III,[10] while Sato and Kuji (1990) found a main sequence class of F0V.[11] It is around 1.2[6] billion years old with a relatively high rotation rate, showing a projected rotational velocity of 72.5 km/s.[3] The star has 1.5[6] times the mass of the Sun and 2.4[1] times the Sun's radius. It is radiating 11.6[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,070 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2[yes|permanent dead link|dead link}}]
- ↑ Boro Saikia, S. et al. (2018), "Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles", Astronomy and Astrophysics 616: A108, doi:10.1051/0004-6361/201629518, Bibcode: 2018A&A...616A.108B.
- ↑ 5.0 5.1 5.2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics 530: A138, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ "40 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=40+Boo.
- ↑ 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.
- ↑ ESA (1997), "The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission", Esa Special Publication (Noordwijk, Netherlands: ESA Publications Division) 1200, Bibcode: 1997ESASP1200.....E.
- ↑ Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific 91: 83–86, doi:10.1086/130446, Bibcode: 1979PASP...91...83C.
- ↑ Sato, K.; Kuji, S. (November 1990), "MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington", Astronomy and Astrophysics Supplement Series 85 (3): 1069–1087, Bibcode: 1990A&AS...85.1069S.
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