 6 Boötis in optical light. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13 49 42.82223 |
| Declination | +21° 15′ 50.8580″ |
| Apparent magnitude (V) | 4.92 |
| Characteristics | |
| Spectral type | K4 III + M8 V |
| B−V color index | 1.432±0.013 |
| Astrometry | |
| Radial velocity (Rv) | −3.71±0.48 km/s |
| Proper motion (μ) | RA: +33.773 mas/yr Dec.: +10.842 mas/yr |
| Parallax (π) | 7.1527 ± 0.3659 mas |
| Distance | 460 ± 20 ly (140 ± 7 pc) |
| Absolute magnitude (MV) | −0.49 |
| Orbit | |
| Period (P) | 944±8 d |
| Eccentricity (e) | 0.41±0.09 |
| Periastron epoch (T) | 2,444,739.5±31.0 JD |
| Argument of periastron (ω) (secondary) | 359±15° |
| Semi-amplitude (K1) (primary) | 1.19±0.15 km/s |
| Details | |
| Radius | 38 R☉ |
| Luminosity | 430.124 L☉ |
| Surface gravity (log g) | 1.910 cgs |
| Temperature | 4,050 K |
| Metallicity | −0.24 dex |
| Rotational velocity (v sin i) | 2.0 km/s |
| Other designations | |
| e Boötis, 53 Cam, BD+21°2578, FK5 3098, GC 18683, HD 120539, HIP 67480, HR 5201, SAO 83015 | |
| Database references | |
| SIMBAD | data |
6 Boötis is a binary star system in the northern constellation of Boötes, located around 460 light years away from the Sun. It has the Bayer designation e Boötis; 6 Boötis is the Flamsteed designation. The system is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.92. It is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.
This is a single-lined spectroscopic binary system with an orbital period of 2.58 years and an eccentricity of 0.4. The visible component is an evolved giant star with a stellar classification of K4 III. Its measured angular diameter is 2.53±0.12 mas. At the estimated distance of the star, this yields a physical size of about 38 times the radius of the Sun. The star is radiating 430 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,050 K. Its companion is probably a low mass red dwarf of around class M8 V.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ 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.
- ^ Yoss, K. M.; Griffin, R. F. (September 1997), "Radial Velocities and DDO, BV Photometry of Henry Draper G5-M Stars Near the North Galactic Pole", Journal of Astrophysics and Astronomy, 18 (2–3): 161, Bibcode:1997JApA...18..161Y, doi:10.1007/BF02714877, S2CID 123221180.
- ^ Griffin, R. F. (June 1985), "Spectroscopic binaries near the North Galactic Pole. Paper 12 : 6 Bootis.", Journal of Astrophysics and Astronomy, 6: 77–83, Bibcode:1985JApA....6...77G, doi:10.1007/BF02715079, S2CID 124682374.
- ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
- ^ McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
- De Medeiros, J. R.; et al. (October 2002), "The Rotation of Binary Systems with Evolved Components", The Astrophysical Journal, 578 (2): 943–950, arXiv:astro-ph/0207288, Bibcode:2002ApJ...578..943D, doi:10.1086/342613, S2CID 16196039.
- ^ "6 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-23.
- Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
