Nu1 Boötis
Template:Other stars by Bayer designation
File:Nu1 Bootis.jpg ν1 (right) and ν2 Boötis in optical light | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +5.02[2] |
| Characteristics | |
| Spectral type | K4.5 IIIb Ba0.4[3] |
| U−B Template:Engvar | +1.91[2] |
| B−V Template:Engvar | +1.59[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: +10.563 mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 3.3492±0.077 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.22[5] |
| Details | |
| Radius | Script error: No such module "val".[6] Template:Solar radius |
| Luminosity | Script error: No such module "val".[6] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[7] dex |
| Rotational velocity (v sin i) | 4.2[8] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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Nu1 Boötis is an orange-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from ν1 Boötis, and abbreviated Nu1 Boo or ν1 Boo. This star has an apparent visual magnitude of +5.02,[2] which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of Script error: No such module "val". as seen from Earth,[1] it is located approximately 970 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.[10] It is drifting closer to the Sun with a radial velocity of −11.1 km/s.[4]
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 weak barium star,[11] 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.[12] The giant component has 99.8 times the radius of the Sun. It is radiating 2,054[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 3,917 K.[7]
Ptolemy considered Nu Boötis to be shared by Hercules, and Bayer assigned it a designation in both constellations: Nu Boötis (ν Boo) and Psi Herculis (ψ Her). When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.[13]
References
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- ↑ a b c d e Template:Cite DR3
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- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1". Nu1 Boötis' database entry at VizieR.
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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External links
- Script error: No such module "citation/CS1".
- Script error: No such module "citation/CS1".