Astronomy:11 Boötis
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 14h 01m 10.48072s[2] |
| Declination | +27° 23′ 11.7452″[2] |
| Apparent magnitude (V) | 6.22±0.01[3] |
| Characteristics | |
| Spectral type | A7 III[4] |
| B−V color index | +0.172[5] |
| Astrometry | |
| Radial velocity (Rv) | −24.0±4.3[6] km/s |
| Proper motion (μ) | RA: −78.929[2] mas/yr Dec.: +18.638[2] mas/yr |
| Parallax (π) | 9.8333 ± 0.0866[2] mas |
| Distance | 332 ± 3 ly (101.7 ± 0.9 pc) |
| Absolute magnitude (MV) | +1.44[1] |
| Orbit[7] | |
| Period (P) | 142.54301±0.17515 d |
| Eccentricity (e) | 0.55834±0.01463 |
| Periastron epoch (T) | 2,457,445.023±0.552 JD |
| Argument of periastron (ω) (secondary) | 177.08±1.44° |
| Semi-amplitude (K1) (primary) | 15.252±0.449 km/s |
| Details | |
| Mass | 1.94[8] M☉ |
| Radius | 2.4627+0.0543−0.0538[2] R☉ |
| Luminosity | 63.63+1.19−1.11[2] L☉ |
| Surface gravity (log g) | 3.93[8] cgs |
| Temperature | 7,997±272[8] K |
| Metallicity [Fe/H] | −0.02[9] dex |
| Rotational velocity (v sin i) | 123[10] km/s |
| Age | 914[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
11 Boötis (HR 5263; HD 122405) is a spectroscopic binary located in the northern constellation Boötes, the herdsman. With an apparent magnitude of 6.22,[3] it is barely visible to the naked eye even under ideal conditions. The system is located relatively close to the Solar System at a distance of 332 light years,[2] and it is drifting closer with a heliocentric radial velocity of −24 km/s.[6] At its current distance, 11 Boötis' brightness is diminished by an interstellar extinction of only 0.03 magnitudes,[12] and it has an absolute visual magnitude of +1.44.[1]
The visible component has a stellar classification of A7 III,[4] indicating that it is an evolved A-type giant star. It has 1.94 times the mass of the Sun and a slightly enlarged radius of 2.46 R☉. It radiates 63.6 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 7,997 K,[8] giving it a white hue when viewed in the night sky. 11 Boötis is slightly metal deficient with an iron abundance 95.5% that of the Sun,[9] and it spins rapidly with a projected rotational velocity of 123 km/s. It is estimated to be 914 million years old.[8] According to Gaia DR3 models, 11 Boötis is a single-lined spectroscopic binary. Both components take 142.54 days to circle around each other in an eccentric orbit.[7]
References
- ↑ 1.0 1.1 1.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
- ↑ 3.0 3.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 4.0 4.1 "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific (IOP Publishing) 79 (467): 102. April 1967. doi:10.1086/128449. Bibcode: 1967PASP...79..102A.
- ↑ Häggkvist, L.; Oja, T. (1969). "Photoelectric BV photometry of 368 northern stars". Arkiv för Astronomi 5: 125–135. ISSN 0004-2048. Bibcode: 1969ArA.....5..125H.
- ↑ 6.0 6.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Gaia Collaboration (2022). "VizieR Online Data Catalog: Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1357....0G.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal 804 (2): 146. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 1063-7737. Bibcode: 2012AstL...38..771G.
- ↑ Royer, F. et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics 393: 897–911. doi:10.1051/0004-6361:20020943. Bibcode: 2002A&A...393..897R.
- ↑ "11 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=11+Boo.
- ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
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