Nu1 Boötis
 ν1 (right) and ν2 Boötis in optical light | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 30m 55.75060s[1] |
| Declination | +40° 49′ 58.9743″[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: +10.563 mas/yr[1] Dec.: −8.385 mas/yr[1] |
| Parallax (π) | 3.3492 ± 0.077 mas[1] |
| Distance | 970 ± 20 ly (299 ± 7 pc) |
| Absolute magnitude (MV) | −2.22[5] |
| Details | |
| Radius | 99.8±4.26[6] R☉ |
| Luminosity | 2,054±163[6] L☉ |
| Surface gravity (log g) | 1.15±0.17[7] cgs |
| Temperature | 3,917±27[7] K |
| Metallicity [Fe/H] | +0.00±0.06[7] dex |
| Rotational velocity (v sin i) | 4.2[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 3.35 mas as seen from Earth,[1] it is located roughly 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]
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,[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 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.[13]
References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series, 171 (1): 146–205, arXiv:astro-ph/0611464, Bibcode:2007ApJS..171..146S, doi:10.1086/511753, S2CID 13946698.
- ^ a b c van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary; van Belle, Gerald; Bucknew, William; Cole, Gary (2021-12-01). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal. 922 (2): 163. arXiv:2107.09205. Bibcode:2021ApJ...922..163V. doi:10.3847/1538-4357/ac1687. ISSN 0004-637X. Nu1 Boötis' database entry at VizieR.
- ^ a b c d Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
- ^ "nu01 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
- ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.
- ^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ "Bayer's Uranometria and Bayer letters". Archived from the original on 2019-03-15. Retrieved 2012-05-18.
External links
[edit]- Hoffleit; et al. (1991), "HR 5763", Bright Star Catalogue (5th Revised ed.), retrieved 2017-09-13.
- "Nu1 Boötis", Aladin previewer, Centre de Données astronomiques de Strasbourg, retrieved 2017-09-12.
