Nu1 Boötis

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]

For other stars with this Bayer designation, see ν Boötis.
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 55.76022s[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
Distance840 ± 50 ly
(260 ± 20 pc)
Absolute magnitude (MV)−2.22[6]
Details
Radius38±2[7] R☉
Luminosity1,626[8] L☉
Surface gravity (log g)1.15±0.17[9] cgs
Temperature3,917±27[9] K
Metallicity [Fe/H]+0.00±0.06[9] dex
Rotational velocity (v sin i)4.2[10] km/s
Other designations
ν1 Boo, 52 Boötis, BD+41° 2609, FK5 573, GC 20866, HD 138481, HIP 75973, HR 5763, SAO 45580[1]
Database references
SIMBADdata

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]

References
  1. "nu01 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. 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.
  4. 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, A61.
  5. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  6. 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.
  7. 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, Bibcode:1999AJ....118.3032N, doi:10.1086/301114.
  8. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  9. 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.
  10. 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.
  11. 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.
  12. Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.
  13. 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.
  • 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.
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