| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14 49 41.29265 |
| Declination | +48° 43′ 14.9077″ |
| Apparent magnitude (V) | 5.68 (6.36 + 6.72) |
| Characteristics | |
| Spectral type | F8V + F7V |
| Astrometry | |
| Radial velocity (Rv) | −30.9±0.3 km/s |
| Proper motion (μ) | RA: −77.94 mas/yr Dec.: 100.83 mas/yr |
| Parallax (π) | 14.58 ± 0.51 mas |
| Distance | 224 ± 8 ly (69 ± 2 pc) |
| Absolute magnitude (MV) | 2.53 |
| Orbit | |
| Period (P) | 12.822 d |
| Eccentricity (e) | 0.39 |
| Periastron epoch (T) | 2,422,379.49 JD |
| Argument of periastron (ω) (secondary) | 97.1° |
| Semi-amplitude (K1) (primary) | 58.3 km/s |
| Semi-amplitude (K2) (secondary) | 72.2 km/s |
| Details | |
| 39 Boo A | |
| Mass | 1.29/1.05 M☉ |
| Metallicity | 0.06 dex |
| Rotational velocity (v sin i) | 161.0 km/s |
| Age | 1.30 Gyr |
| 39 Boo B | |
| Mass | 1.25 M☉ |
| Other designations | |
| 39 Boo, AG+48°1158, BD+49°2326, HD 131041, HIP 72524, HR 5538, SAO 45231, CCDM J14497+4843, WDS J14497+4843 | |
| Database references | |
| SIMBAD | data |
39 Boötis is a triple star system located around 224 light years away from the Sun in the northern constellation of Boötes. It is visible to the naked eye as a faint, yellow-white hued star with a combined apparent magnitude of 5.68. The system is moving closer to the Earth with a heliocentric radial velocity of −31 km/s.
The magnitude 6.36 primary, component A, is actually a double-lined spectroscopic binary system with an orbital period of 12.822 days, an eccentricity of 0.39, and an angular separation of 2.021 mas. It has a combined stellar classification of F8V, matching an F-type main-sequence star, with individual massed of 1.29 and 1.05 times the mass of the Sun. Component B is of magnitude 6.72 with a class of F7V and 1.25 solar masses. The A–B pair have a separation of 2.9″ and a period of 1,347.653 years. This system is a source of X-ray emission with a luminosity of 41.4×10 erg s.
It was a transferred by Jérôme Lalande from Boötes to Quadrans Muralis. Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Boötes.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Abt, Helmut A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement. 180 (1): 117–18. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. S2CID 122811461.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ Pizzolato, N.; et al. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614–628. Bibcode:2000A&A...361..614P.
- ^ Pourbaix, D.; et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits". Astronomy & Astrophysics. 424: 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- ^ Tokovinin, A.; et al. (2008). "Tertiary companions to close spectroscopic binaries". Multiple Stars Across the H-R Diagram, ESO Astrophysics Symposia. Berlin Heidelberg. p. 129. arXiv:astro-ph/0601518. Bibcode:2006yCat..34500681T. doi:10.1051/0004-6361:20054427. ISBN 978-3-540-74744-4.
- ^ Casagrande, L.; et al. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
- ^ "39 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
- Pizzolato, N.; et al. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614–628. Bibcode:2000A&A...361..614P.
- Smyth, William Henry (1844). A Cycle of Celestial Objects: For the Use of Naval, Military, and Private Astronomers. Vol. 2. London, United Kingdom: John W. Parker. p. 329.
