Astronomy:Nu1 Boötis
 ν1 (right) and ν2 Boötis in optical light | |
| Observation data 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[5] mas |
| 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 |
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]
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]
References
- ↑ 1.0 1.1 1.2 "nu01 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu01+Boo.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 5.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 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, doi:10.1086/511753, Bibcode: 2007ApJS..171..146S.
- ↑ 7.0 7.1 Nordgren, Tyler E. et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal 118 (6): 3032–3038, doi:10.1086/301114, Bibcode: 1999AJ....118.3032N, http://digitalcommons.wcupa.edu/cgi/viewcontent.cgi?article=1008&context=phys_facpub.
- ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 9.0 9.1 9.2 9.3 Prugniel, Ph. et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics 531: A165, doi:10.1051/0004-6361/201116769, Bibcode: 2011A&A...531A.165P.
- ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D.
- ↑ 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, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ "Bayer's Uranometria and Bayer letters". http://www.ianridpath.com/startales/bayer.htm.
External links
- Hoffleit (1991), "HR 5763", Bright Star Catalogue, http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205763, retrieved 2017-09-13.
- "Nu1 Boötis", Aladin previewer (Centre de Données astronomiques de Strasbourg), http://aladin.u-strasbg.fr/AladinPreview?-c=15+30+55.7593%2B40+49+58.968&ident=*++52+Boo&submit=Aladin+previewer, retrieved 2017-09-12.
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