Astronomy:Psi Boötis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 04m 26.743s[1] |
| Declination | +26° 56′ 51.53″[1] |
| Apparent magnitude (V) | +4.55[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K2 III[4] |
| U−B color index | +1.34[2] |
| B−V color index | +1.23[2] |
| Astrometry | |
| Radial velocity (Rv) | −25.72±0.18[5] km/s |
| Proper motion (μ) | RA: −174.718[1] mas/yr Dec.: −5.036[1] mas/yr |
| Parallax (π) | 12.6144 ± 0.0896[1] mas |
| Distance | 259 ± 2 ly (79.3 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.16[6] |
| Details | |
| Mass | 1.38[7] M☉ |
| Radius | 20[5] R☉ |
| Luminosity | 135[7] L☉ |
| Surface gravity (log g) | 2.2[5] cgs |
| Temperature | 4,302±22[7] K |
| Metallicity [Fe/H] | −0.35[5] dex |
| Rotational velocity (v sin i) | 3.5[5] km/s |
| Age | 4.16[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Psi Boötis is a single,[10] orange-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from ψ Boötis, and abbreviated Psi Boo or ψ Boo. This is a dim star that is visible to the naked eye with an apparent visual magnitude of +4.55.[2] Based upon an annual parallax shift of 12.6 mas as seen from the Earth, it is located about 259 light-years (79 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.09 due to interstellar dust.[6] It is traversing the sky with a net proper motion of 0.176 arc seconds per year,[11] and has a radial velocity toward the Sun of −25.72 km/s.[5]
This star has a stellar classification of K2 III,[4] matching an evolved K-type giant star. It belongs to the so-called red clump,[3] indicating that it is generating energy through helium fusion at its core. This star is about four[7] billion years old and is spinning with a projected rotational velocity of 3.5 km/s.[5] It has an estimated 1.38[7] times the mass of the Sun and has expanded to 20[5] times the Sun's radius. Psi Boötis radiating 135[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,302 K.[7]
Name
This star, according to Assemani, with another in the right arm that may have been ε Boo (Izar), constituted the Arabs' Al Aulād al Nadhlāt, which he rendered filii altercationis (sons of contention); but the original signifies "the Low, or Mean, Little Ones".[12]
Al Aulād al Nadhlāt or Aulad al Nathlat was the title of this star in the catalogue of stars in Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars.[8]
References
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 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 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ 6.0 6.1 Famaey, B. et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430: 165–186, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 8.0 8.1 Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology, https://ntrs.nasa.gov/citations/19720005197, retrieved 2025-06-06.
- ↑ "psi Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi+Boo.
- ↑ 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.
- ↑ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal 129 (3): 1483–1522, doi:10.1086/427854, Bibcode: 2005AJ....129.1483L.
- ↑ Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. 1963. p. 106. ISBN ((0-486-21079-0)). https://archive.org/details/starnamestheirlo00alle/page/106. Retrieved 2010-12-12.
References
- Hoffleit (1991), "HR 5616", Bright Star Catalogue, http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205616, retrieved 2017-09-11.
- "psi Boo", Aladin previewer (Centre de Données astronomiques de Strasbourg), http://aladin.u-strasbg.fr/AladinPreview?-c=15+04+26.7417%2B26+56+51.536&ident=NLTT+39223&submit=Aladin+previewer, retrieved 2017-09-11.
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