2015 Seminar List:
The talk will consist of two parts. In the first part, I will present the preliminary results of my on-going work about the Orion molecular clouds.
Recently, extremely cold sources, so-called PACS Bright Red Sources (PBRS), have been identified via Herschel dust continuum observations in the Orion molecular cloud complex.
The PBRS are the objects with very red colors in 24 micron to 70 micron and are proposed as very young Class 0 protostars embedded in dense envelopes.
I will present the deuterium fractionation of various molecular lines towards a sample of 11 PBRS and 4 previously identified Class 0 protostars (non-PBRS) in Orion A and B clouds.
The variation of the deuterium fractionation of the PBRS sample implies that the PBRS with high D/H ratios are in the very earliest stage of star formation or they have a different formation history.
In the second part, I will talk about my research visit to MPIfR in Germany.