CP Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 6.40[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | F8 IVw[4] |
| U−B Template:Engvar | 0.07[2] |
| B−V Template:Engvar | 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 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.05[2] |
| Details | |
| Mass | 1.77[6] Template:Solar mass |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| 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 |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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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 Script error: No such module "val".,[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]
In May of 1977, Michel Auvergne et al. inadvertently discovered that the star is a variable star, when they used it as a comparison star for photometric observations of gamma Boötis.[9] It was given its variable star designation, CP Boötis, in 1981.[10]
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[11] that varies by 0.02 magnitude.[12] 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
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- ↑ a b c d e f Template:Cite DR2
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- ↑ a b c Script error: No such module "citation/CS1".
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See: CP Boo - ↑ a b c d e f g h i j Script error: No such module "citation/CS1".
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- ↑ Template:Cite simbad
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