Перегляд за Автор "Soubiran, C."

Зараз показуємо 1 - 3 з 3
  • Ескіз
    Документ
    n-CAPTURE ELEMENTAL ABUNDANCES IN ACTIVE AND NON-ACTIVE STARS
    (Astroprint, 2010-07) Basak, N. Yu.; Mishenina, T. V.; Soubiran, C.; Kovtyukh, Valery V.; Belik, S. I.
    Abundances of Y, Zr, La, Ce, Nd, and Sm have been obtained under LTE approximationss. The program stars were observed at high resolution, high signal to noise ratio with the ELODIE echelle spectrograph (OHP, France). Among them more than 30 stars are active stars with a fraction of BY Dra and RS CVn type stars. Comparison of the behavior of n-capture elemental abundance in active and non active stars was made.
  • Ескіз
    Документ
    Solar Twins: Lithium Abundance Scatter (that is the question)
    (2019) Mishenina, Tamara V.; Soubiran, C.; Charbonnel, C.; Katsova, M. M.; Nizamov, B. A.; Мішеніна, Тамара Василівна; Мишенина, Тамара Васильевна
    In order to shed new light on the dispersion of Li in the atmosphere of solar type stars, a set of 56 solar analogs including 22 solar twins is analysed. Lithium abundances are derived by comparing observed and synthetic spectra in the region of Li I line 6707 Å in LTE approximation. The behavior of Li abundances as a function of the effective temperature Teff, age, rotational velocities vsini and chromospheric activity log R’HK is discussed in the context of stellar and galactic evolution.
  • Ескіз
    Документ
    THE NEW ABSOLUTE PARAMETERS OF OU GEM - THE STAR OF BY DRA TYPE
    (Astroprint, 2010) Mishenina, T. V.; Glazunova, L. V.; Soubiran, C.; Kovtyukh, Valery V.
    The spectra of OU Gem were obtained with the fiber-fed echelle spectrograph SOPHIE at the 1.93-m telescope of the Observatoire de Haute-Provence (France). The temperatures of components of the system were defined and are equal to 5013 ± 15 K and 4486±50 K for primary (A) and secondary(B) components, accordingly. The rotation velocity of components are measured: for primary component it is equal to 5.1±1 km/s and 6.2 ± km/s for the secondary one. The definition of radial velocities of components by LSD profile method and redetermination of spectral orbital elements were carried out. New absolute parameters of components were obtained too.