11 Boötis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| 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 mas/yr[2] Dec.: +18.638 mas/yr[2] |
| Parallax (π) | 9.8333±0.0866 mas[2] |
| 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 | |
| 11 Boötis, AG+27° 1336, BD+28°2287, FK5 517, GC 18943, HD 122405, HIP 68478, HR 5263, SAO 83130, TIC 28171319[11] | |
| 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 a 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
[edit]- ^ a b c 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 h Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b Appenzeller, I. (April 1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79. IOP Publishing: 102. Bibcode:1967PASP...79..102A. doi:10.1086/128449. S2CID 122306746.
- ^ Häggkvist, L.; Oja, T. (1969). "Photoelectric BV photometry of 368 northern stars". Arkiv för Astronomi. 5: 125–135. Bibcode:1969ArA.....5..125H. ISSN 0004-2048.
- ^ a b 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.
- ^ a b 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.
- ^ a b c d e f 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. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
- ^ a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737.
- ^ 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. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
- ^ "11 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 28, 2019.
- ^ 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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
