Astronomy:6 Boötis
 6 Boötis in optical light. | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes |
| Right ascension | 13h 49m 42.82223s[1] |
| Declination | +21° 15′ 50.8580″[1] |
| Apparent magnitude (V) | 4.92[2] |
| Characteristics | |
| Spectral type | K4 III[3] + M8 V[4] |
| B−V color index | 1.432±0.013[2] |
| Astrometry | |
| Radial velocity (Rv) | −3.71±0.48[1] km/s |
| Proper motion (μ) | RA: +33.773[1] mas/yr Dec.: +10.842[1] mas/yr |
| Parallax (π) | 7.1527 ± 0.3659[1] mas |
| Distance | 460 ± 20 ly (140 ± 7 pc) |
| Absolute magnitude (MV) | −0.49[2] |
| Orbit[4] | |
| 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[5] R☉ |
| Luminosity | 430.124[1] L☉ |
| Surface gravity (log g) | 1.910[6] cgs |
| Temperature | 4,050[6] K |
| Metallicity [Fe/H] | −0.24[6] dex |
| Rotational velocity (v sin i) | 2.0[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
6 Boötis is a binary star[4] system in the northern constellation of Boötes,[8] located around 460 light years away from the Sun.[1] It has the Bayer designation e Boötis; 6 Boötis is the Flamsteed designation.[8] The system is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.92.[2] It is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.[2]
This is a single-lined spectroscopic binary system with an orbital period of 2.58 years and an eccentricity of 0.4.[4] The visible component is an evolved giant star with a stellar classification of K4 III.[3] Its measured angular diameter is 2.53±0.12 mas.[9] At the estimated distance of the star, this yields a physical size of about 38 times the radius of the Sun.[5] The star is radiating 430[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,050 K.[6] Its companion is probably a low mass red dwarf of around class M8 V.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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, doi:10.1007/BF02714877, Bibcode: 1997JApA...18..161Y.
- ↑ 4.0 4.1 4.2 4.3 4.4 Griffin, R. F. (June 1985), "Spectroscopic binaries near the North Galactic Pole. Paper 12 : 6 Bootis.", Journal of Astrophysics and Astronomy 6: 77–83, doi:10.1007/BF02715079, Bibcode: 1985JApA....6...77G.
- ↑ 5.0 5.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(140\cdot 2.53\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 76.2\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 6.0 6.1 6.2 6.3 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, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M
- ↑ De Medeiros, J. R. et al. (October 2002), "The Rotation of Binary Systems with Evolved Components", The Astrophysical Journal 578 (2): 943–950, doi:10.1086/342613, Bibcode: 2002ApJ...578..943D.
- ↑ 8.0 8.1 8.2 "6 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+Boo.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
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