Molecular hydrogen emission from discs in the Chamaeleontis cluster
نویسندگان
چکیده
منابع مشابه
Molecular Hydrogen emission from disks in the eta Chamaeleontis cluster
Disks in the 6 Myr old cluster η Chamaeleontis were searched for emission from hot H2 . Around the M3 star ECHA J0843.4-7905 we detect circumstellar gas orbiting at ∼2 AU. If the gas is UV-excited, the ro-vibrational line traces a hot gas layer supported by a disk of mass ∼0.03 M⊙ , similar to the minimum mass solar nebula. Such a gas reservoir at 6 Myr would promote the formation and inwards m...
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The η Chamaeleontis star cluster is one of the most important nearby groupings of pre-main sequence (PMS) stars. With accurately known distance, compact structure and highly-coeval intermediate-aged population, the η Cha cluster is an important laboratory for enhancing our understanding of all PMS star evolutionary issues. In this paper, recent results concerning the stellar population are disc...
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The newly-commissioned University of New South Wales Infrared Fabry-Perot (UNSWIRF) has been used to image molecular hydrogen emission at 2.12 and 2.25 m in the reeection nebula Parsamyan 18. P 18 is known to exhibit low values of the (1 ? 0)=(2 ? 1) S(1) ratio suggestive of UV-pumped uorescence rather than thermal excitation by shocks. Our line ratio mapping reveals the full extent of this uor...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2007
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2007.12049.x