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Orange-hued star in the constellation Boötes From Wikipedia, the free encyclopedia
Nu1 Boötis (ν1 Boötis) is an orange-hued star in the northern constellation of Boötes. It has an apparent visual magnitude of +5.02,[2] which indicates the star is faintly visible to the naked eye. Based upon an annual parallax shift of 3.89 mas as seen from Earth,[5] it is located roughly 840 light years distant from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction of 0.13 due to interstellar dust.[11]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Boötes |
Right ascension | 15h 30m 55.76022s[1] |
Declination | +40° 49′ 58.9709″[1] |
Apparent magnitude (V) | +5.02[2] |
Characteristics | |
Spectral type | K4.5 IIIb Ba0.4[3] |
U−B color index | +1.91[2] |
B−V color index | +1.59[2] |
Astrometry | |
Radial velocity (Rv) | −11.12±0.16[4] km/s |
Proper motion (μ) | RA: +11.28[5] mas/yr Dec.: −8.11[5] mas/yr |
Parallax (π) | 3.89 ± 0.25 mas[5] |
Distance | 840 ± 50 ly (260 ± 20 pc) |
Absolute magnitude (MV) | −2.22[6] |
Details | |
Radius | 38±2[7] R☉ |
Luminosity | 1,626[8] L☉ |
Surface gravity (log g) | 1.15±0.17[9] cgs |
Temperature | 3,917±27[9] K |
Metallicity [Fe/H] | +0.00±0.06[9] dex |
Rotational velocity (v sin i) | 4.2[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K4.5 IIIb Ba0.4.[3] The 'Ba0.4' suffix notation indicates this is a barium star,[12] which means that the stellar atmosphere has been enhanced by s-process elements most likely provided by what is now an orbiting white dwarf companion.[13] The giant component has 38±2 times the radius of the Sun.[7] It is radiating 1,626[8] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 3,917 K.[9]
Ptolemy considered Nu1 Boötis to be shared by Hercules, and Bayer assigned it a designation in both constellations: Nu1 Boötis (ν1 Boo) and Psi1 Herculis (ψ1 Her). When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.[14]
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