Browsing by Author "Pavlenko, Ya. V."

Now showing items 1-6 of 6

    • Abundances in the atmosphere of the metal-rich planet-host star HD 77338 

      Kushniruk, I.O.; Pavlenko, Ya. V.; Jenkins, J.S.; Jones, Hugh (2014)
      Abundances of Fe, Si, Ni, Ti, Na, Mg, Cu, Zn, Mn, Cr and Ca in the atmosphere of the K-dwarf HD 77338 are determined and discussed. HD 77338 hosts a hot Uranus-like planet and is currently the most metal-rich single star ...

    • Benchmark low-mass objects in Moving Groups 

      Galvez-Ortiz, M. C.; Kuznetsov, M.; Clarke, J. R. A.; Pavlenko, Ya. V.; Pinfield, D.J.; Jones, H.R.A.; Jenkins, J. S.; Barnes, J.; Burningham, B.; Day-Jones, A. C.; Martin, E. L.; Perez, A. E. Garcia; Pokorny, R.S. (EDP Sciences, 2013)
      In order to compile a sample of ultracool dwarfs that will serve as benchmarks for testing theoretical formation and evolutionary models, we selected low-mass cool (>M7) objects that are potentially members of five known ...

    • Physical parameters of the binary star CM draconis components 

      Kuznetsov, M. K.; Pavlenko, Ya. V.; Pinfield, D.J.; Jones, H.R.A. (2012-05)
      Spectra of the eclipsing binary star CM Dra consisting of two M dwarfs are discussed in detail. High-resolution echelle spectra (R = 47000) obtained using the 4.2 m William Hershel telescope are used. The temperatures and ...

    • Probing M subdwarf metallicity with an esdK5+esdM5.5 binary 

      Pavlenko, Ya. V.; Zhang, Z. H.; Gálvez-Ortiz, M. C.; Kushniruk, I. O.; Jones, H.R.A. (2015-10-15)
      We present a spectral analysis of the binary G 224-58 AB that consists of the coolest M extreme subdwarf (esdM5.5) and a brighter primary (esdK5). This binary may serve as a benchmark for metallicity measurement calibrations ...

    • Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups 

      Galvez-Ortiz, M. C.; Kuznetsov, M.; Clarke, J. R. A.; Pavlenko, Ya. V.; Folkes, S. L.; Pinfield, David; Jones, Hugh; Jenkins, J. S.; Barnes, John; Burmingham, B.; Day-Jones, A. C.; Martin, E. L.; Garcia Perez, A. E.; del Burgo, C.; Pokorny, R. S. (2014-04-21)
      We present a study of age-related spectral signatures observed in 25 young low-mass objects that we have previously determined as possible kinematic members of five young moving groups: the Local Association (Pleiades ...

    • Starspot distributions on fully convective M dwarfs : implications for radial velocity planet searches 

      Barnes, J.R.; Jeffers, S.V.; Jones, H.R.A.; Pavlenko, Ya. V.; Jenkins, J. S.; Haswell, C.A.; Lohr, M. E. (2015-10-07)
      Since M4.5 - M9 dwarfs exhibit equatorial rotation velocities of order 10 km/s on average, radial velocity surveys targeting this stellar population will likely need to find methods to effectively remove starspot jitter. ...