Astronomy:CP Boötis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 33m 20.26330s[1] |
| Declination | +36° 57′ 32.4483″[1] |
| Apparent magnitude (V) | 6.40[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | F8 IVw[4] |
| U−B color index | 0.07[2] |
| B−V color index | 0.51[2] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | +5.9[6] km/s |
| Proper motion (μ) | RA: +2.694[1] mas/yr Dec.: −73.096[1] mas/yr |
| Parallax (π) | 12.9135 ± 0.0244[1] mas |
| Distance | 252.6 ± 0.5 ly (77.4 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.05[2] |
| Details | |
| Mass | 1.77[6] M☉ |
| Luminosity | 12.0+1.5 −1.3[7] L☉ |
| Surface gravity (log g) | 3.67[6] cgs |
| Temperature | 6,276[6] K |
| Metallicity [Fe/H] | 0.25[6] dex |
| Rotational velocity (v sin i) | 5.7[3] km/s |
| Age | 1.70[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
CP Boötis is a yellow-white hued star in the northern constellation of Boötes. With a baseline apparent visual magnitude of 6.40,[2] it is at or near the lower limit for visibility with the typical naked eye in good viewing conditions. The distance to this star can be estimated from its annual parallax shift of 12.91 mas,[1] which yields a range of 252.6 light years. It is moving further away with a heliocentric radial velocity of +5.9 km/s.[6]
This is an F-type subgiant star with a stellar classification of F8 IVw,[4] which indicates it has nearly consumed the hydrogen at its core and is now evolving into a giant star. It is a low amplitude Delta Scuti variable[9] that varies by 0.02 magnitude.[10] At the age of 1.7[6] billion years it is spinning with a projected rotational velocity of 5.7 km/s.[3] The star has 1.77[6] times the mass of the Sun and is radiating 12[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,276 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 Karatas, Y.; Schuster, W. J. (October 2006), "Metallicity and absolute magnitude calibrations for UBV photometry", Monthly Notices of the Royal Astronomical Society 371 (4): 1793–1812, doi:10.1111/j.1365-2966.2006.10800.x, Bibcode: 2006MNRAS.371.1793K.
- ↑ 3.0 3.1 3.2 Lèbre, A. et al. (1999), "Lithium and rotation on the subgiant branch. I. Observations and spectral analysis", Astronomy and Astrophysics 345: 936, Bibcode: 1999A&A...345..936L.
- ↑ 4.0 4.1 Barry, Don C. (January 1970), "Spectral classification of A & F stars", Astrophysical Journal Supplement 19: 281, doi:10.1086/190209, Bibcode: 1970ApJS...19..281B
- ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
See: CP Boo - ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 Casagrande, L. et al. (June 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.
- ↑ 7.0 7.1 do Nascimento, J. D., Jr. et al. (May 2000), "Lithium and rotation on the subgiant branch. II. Theoretical analysis of observations", Astronomy and Astrophysics 357: 931–937, Bibcode: 2000A&A...357..931D.
- ↑ "HD 127986". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+127986.
- ↑ Galeev, A. I. et al. (November 2012), "Chemical composition of δ Scuti stars: 1. AO CVn, CP Boo, KW Aur", Astronomy Reports 56 (11): 850–866, doi:10.1134/S1063772912110029, Bibcode: 2012ARep...56..850G
- ↑ Watson, Christopher (January 4, 2010), "CP Boötis", AAVSO Website (American Association of Variable Star Observers), http://www.aavso.org/vsx/index.php?view=detail.top&oid=4419, retrieved 3 August 2014.
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