منابع مشابه
Protoplanetary Disk Masses in the Young Ngc 2024 Cluster
We present the results from a Submillimeter Array survey of the 887 μm continuum emission from the protoplanetary disks around 95 young stars in the young cluster NGC 2024. Emission was detected from 22 infrared sources, with flux densities from ∼5 to 330 mJy; upper limits (at 3σ) for the other 73 sources range from 3 to 24 mJy. For standard assumptions, the corresponding disk masses range from...
متن کاملThe peculiar circumstellar environment of NGC 2024 - IRS 2
We re-examine the nature of NGC 2024 IRS2 in light of the recent discovery of the late O-type star, IRS2b, located 5′′ from IRS2. Using L-band spectroscopy, we set a lower limit of AV = 27.0 mag on the visual extinction towards IRS2. Arguments based on the nature of the circumstellar material, favor an AV of 31.5 mag. IRS2 is associated with the UCH region G206.543–16.347 and the infrared sou...
متن کاملThermal plume turbulence
A two-dimensional Boussinesq model of thermal convection is investigated by numerical simulations. The turbulent heat transport is mainly due to thermal plumes. It is shown that their thin, wrinkled interfaces control the statistics of large temperature excursions. Away from the interfaces, the temperature fluctuations are strongly suppressed and the field in those regions is well mixed. Their ...
متن کاملA Near - Infrared L Band Survey of the Young Embedded Cluster NGC 2024
We present the results of the first sensitive L band (3.4 μm) imaging study of the nearby young embedded cluster NGC 2024. Two separate surveys of the cluster were acquired in order to obtain a census of the circumstellar disk fraction in the cluster. We detected 257 sources to the mL ≤ 12.0 completeness limit of our ∼110 arcmin primary survey region. An additional 26 sources with 12.0 < L < 14...
متن کاملA Deep Chandra X - ray Observation of the Embedded Young Cluster in NGC 2024
We present results of a sensitive 76 ksec Chandra observation of the young stellar cluster in NGC 2024, lying at a distance of ∼415 pc in the Orion B giant molecular cloud. Previous infrared observations have shown that this remarkable cluster contains several hundred embedded young stars, most of which are still surrounded by circumstellar disks. Thus, it presents a rare opportunity to study X...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1997
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/290.3.431