Akademik Veri Yönetim Sistemi
Conditions and impact of star formation: New results with Herschel and beyond" (The 5th Zermatt ISM Symposium), Zürich, İsviçre, 18 - 24 Eylül 2011, cilt.52, ss.313-314, (Tam Metin Bildiri)
Herschel-HIFI observations of high-J lines (up to Ju = 10) of 12CO, 13CO and C18O are presented toward three deeply embedded low-mass protostars in NGC 1333. The observations show several energetic components including shocked and quiescent gas. Radiative transfer models are used to quantify the C18O envelope abundance which require a jump in the abundance at an evaporation temperature, Tev ~ 25 K, providing new direct evidence of a CO ice evaporation zone around protostars. The abundance in the outermost part of the envelope, X0, is within the canonical value of 2 × 10-4; however the inner abundance, Xin, is found around a factor of 3-5 lower than X0.