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 3.35 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]

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 55.75060s[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
ν1 Boo, ψ1 Her, 52 Boötis, BD+41°2609, FK5 573, GC 20866, HD 138481, HIP 75973, HR 5763, SAO 45580[9]
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,^[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

1. 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.
2. 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. 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, S2CID 59451347, A61.
5. 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.
6. 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.
7. 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.
8. 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.
9. "nu01 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
10. 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.
11. Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.
12. 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.
13. "Bayer's Uranometria and Bayer letters". Archived from the original on 2019-03-15. Retrieved 2012-05-18.

External links

• 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.