Spectroscopical study of faint Southern Cepheids with Southern African Large Telescope (SALT). First results.
Вантажиться...
Дата
2017
Науковий керівник
Укладач
Редактор
Назва журналу
ISSN
E-ISSN
Назва тому
Видавець
Одеський національний університет імені І. І. Мечникова
Анотація
First Cepheids observations using
echelle-spectrograph HRS fed by Southern African
Large Telescope (SALT) were realized during 2016.
All spectra have been obtained in the medium
resoltion mode (R 31000–41000) wth high S/N ratio
near 50–220. All data were processed using package
developed by authors based on the standard system
of astronomical data reduction MIDAS. Using new
echelle data we found the atmosphere parameters
and chemical composition for 30 faint Cepheids of
southern hemisphere, where for the most of theses
stars these results we obtained for the first time. 28
stars are Cepheids after the first-dredge up stage,
while ASAS 075842-25336.1 and ASAS 1131714-6605.0
having remarkable Li I 6707.8 ˚A absorption line and
anomalous CNO and Na content could be consider as
first crossing of the Cepheids instability strip.
Опис
Ключові слова
Cepheids, atmosphere parameters, chemical composition
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації