| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 14m 50.85024s [1] |
| Declination | +10° 06′ 02.1964″ [1] |
| Apparent magnitude (V) | 5.45 (5.51 + 8.53) [2] |
| Characteristics | |
| Spectral type | K1 III [3] |
| B−V color index | 1.007±0.003 [4] |
| Astrometry | |
| Radial velocity (Rv) | +16.80±0.40 [4] km/s |
| Proper motion (μ) |
RA: −20.83
[1]
mas/
yr Dec.: −164.41 [1] mas/ yr |
| Parallax (π) | 12.31 ± 0.59 mas [1] |
| Distance | 260 ± 10
ly (81 ± 4 pc) |
| Absolute magnitude (MV) | 0.75 [4] |
| Details | |
| Mass | 1.48±0.42 [5] M☉ |
| Radius | 10 [6] R☉ |
| Luminosity | 61.08 [4] L☉ |
| Surface gravity (log g) | 2.55±0.11 [5] cgs |
| Temperature | 4,845±92 [5] K |
| Metallicity [Fe/H] | −0.26 [7] dex |
| Rotational velocity (v sin i) | 0.0 [6] km/s |
| Age | 2.0+0.8 −0.6 [5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Boötis is a binary star [2] system in the northern constellation of Boötes, [8] located approximately 260 light years away from the Sun. [1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45. [2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum. [9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s. [4]
The magnitude 5.51 [2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III. [3] It is a red clump giant, [7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two [5] billion years old with 1.5 [5] times the mass of the Sun and has expanded to 10 [6] times the Sun's radius. The star is radiating 61 [4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K. [5]
Its companion, component B, is a magnitude +8.53 star [2] was located at an angular separation of 0.80 ″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936. [10]
References
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d e 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.
- ^ a b Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode: 1970AJ.....75..165H, doi: 10.1086/110956.
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv: 1511.04088, Bibcode: 2016ApJ...817...40F, doi: 10.3847/0004-637x/817/1/40, S2CID 118675933.
- ^ a b c 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, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209, S2CID 121883397
- ^ a b Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
- ^ a b "15 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2019.
- ^ 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, arXiv: astro-ph/0412070, Bibcode: 2005AJ....129.1483L, doi: 10.1086/427854, S2CID 2603568.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920, retrieved 2015-07-22.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 14m 50.85024s [1] |
| Declination | +10° 06′ 02.1964″ [1] |
| Apparent magnitude (V) | 5.45 (5.51 + 8.53) [2] |
| Characteristics | |
| Spectral type | K1 III [3] |
| B−V color index | 1.007±0.003 [4] |
| Astrometry | |
| Radial velocity (Rv) | +16.80±0.40 [4] km/s |
| Proper motion (μ) |
RA: −20.83
[1]
mas/
yr Dec.: −164.41 [1] mas/ yr |
| Parallax (π) | 12.31 ± 0.59 mas [1] |
| Distance | 260 ± 10
ly (81 ± 4 pc) |
| Absolute magnitude (MV) | 0.75 [4] |
| Details | |
| Mass | 1.48±0.42 [5] M☉ |
| Radius | 10 [6] R☉ |
| Luminosity | 61.08 [4] L☉ |
| Surface gravity (log g) | 2.55±0.11 [5] cgs |
| Temperature | 4,845±92 [5] K |
| Metallicity [Fe/H] | −0.26 [7] dex |
| Rotational velocity (v sin i) | 0.0 [6] km/s |
| Age | 2.0+0.8 −0.6 [5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Boötis is a binary star [2] system in the northern constellation of Boötes, [8] located approximately 260 light years away from the Sun. [1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.45. [2] The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.166 arc seconds per annum. [9] It is moving away from the Earth with a heliocentric radial velocity of +16.8 km/s. [4]
The magnitude 5.51 [2] primary, designated component A, is an aging K-type giant star with a stellar classification of K1 III. [3] It is a red clump giant, [7] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around two [5] billion years old with 1.5 [5] times the mass of the Sun and has expanded to 10 [6] times the Sun's radius. The star is radiating 61 [4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,845 K. [5]
Its companion, component B, is a magnitude +8.53 star [2] was located at an angular separation of 0.80 ″ along a position angle of 111° from the primary, as of 2015. This is the same separation it had when the system was discovered in 1936. [10]
References
- ^ a b c d e f 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, S2CID 18759600.
- ^ a b c d e 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.
- ^ a b Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode: 1970AJ.....75..165H, doi: 10.1086/110956.
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e f g Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv: 1511.04088, Bibcode: 2016ApJ...817...40F, doi: 10.3847/0004-637x/817/1/40, S2CID 118675933.
- ^ a b c 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, Bibcode: 2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209, S2CID 121883397
- ^ a b Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
- ^ a b "15 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 7, 2019.
- ^ 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, arXiv: astro-ph/0412070, Bibcode: 2005AJ....129.1483L, doi: 10.1086/427854, S2CID 2603568.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920, retrieved 2015-07-22.
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