|
|
You are cordially invited to afternoon |
Astronomy Tea Talks at Caltech
Mondays, Robinson 106
|
|
| Organised by: |
| 2007 - 2008 season: | |
|---|---|
|
TUESDAY 22 January 2008 |
Tim van Kempen (Leiden)
"The warm and dense gas of embedded low-mass protostars" Embedded low-mass protostars, also known as the Class 0 and Class I evolutionary stages, have been studied extensively the last decade. Although much is known about the cold outer regions on scales of a few tens of thousand of AU from dust and gas studies, far less information exists about the inner regions, where the dense and warm gas is located. The dense gas in the center, close to where the material in the envelope accretes onto the central star and disk system, is studied using molecular lines with the new HARP-B array on the JCMT for a large sample of embedded objects in the L1688 region. Comparison between high density and cloud material tracers characterizes these inner regions of embedded sources. In addition, it is found that many sources thought to be embedded from (near)-IR studies, are not embedded, but confused by geometrical effects. The warm gas, with temperatures above 100 Kelvin, is studied using the new 650/800 GHz heterodyne array receiver CHAMP+ on the APEX telescope. Such studies disentangle the warm gas heated thermally from that shock heated by the outflowing gas. First results of CO isotopologues of a recently started project will be presented. |
| More astronomy-related talks | |
|---|---|
|
|
| Archives | |
|
|
|
| Last modified on 20th Jul 2011 by Johan Richard. | |
