The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru
seminar organizers (Tomonori Usuda, Kumiko S. Usuda, Masahiko Hayashi, Masayuki Akiyama)
December 10, Friday at 11:00am
" Dust Settlement in Orion Proplyds"
Takuya Yamashita (Subaru Telescope, NAOJ)
We have made mid-infrared and H2 emission surveys of Orion proplyds
in order to study behavior of gaseous and solid components within
their circumstellar disks using COMICS and IRCS on Subaru.
We found an clear anti correlation between the MIR flux density and
the H2 emission, i.e. proplyds strong in H2 mission had weak MIR
emission. This anti correlation is naturally understood as an
evolutional sequence of evaporation for proplyds in which gaseous
and solid components are separated along the z direction within the
circumstellar disk. We argue that the separation is likely to be
caused by settlement of dust grains onto the disk equator.
Seminars are also held at JAC,