منابع مشابه
The λ-Orionis Ring in CO
The results of a new CO(J=1→0) survey of the ring of molecular clouds around the H ii region Sh-2-264 and the λ-Orionis OB-association are presented. The distribution of molecular gas closely approximates that of the dust seen in IRAS emission. The total molecular mass is 1.4×104 M . The mass spectrum of the emission clumps is a power-law with index -1.8, similar to that observed in other star-...
متن کاملA Photometric Study of the Young Stellar Population Throughout the λ Orionis Star-Forming Region
We present VRI photometry of 320,917 stars with 11 . R . 18 throughout the λ Ori star-forming region. Using the more spatially limited spectroscopic surveys of Dolan & Mathieu to define the color magnitude domain of young low-mass members of the association, and removing statistically the field stars in this domain, we use our photometry to identify a representative PMS population throughout th...
متن کاملFirst AU-scale observations of V1647 Orionis with VLTI/MIDI
The young eruptive star V1647 Ori was observed with MIDI, the mid-infrared interferometric instrument at the Very Large Telescope Interferometer (VLTI), on March 2, 2005. We present the first spectrally resolved interferometric visibility points for this object. Our results show that (1) the mid-infrared emitting region is extended, having a size of ≈7 AU at 10 μm; (2) no signatures of a close ...
متن کاملNew deep XMM - Newton observations to the west of the σ Orionis cluster
Aims. The objective of this study is to determine the general X-ray properties of the young stars in the external regions of the σ Orionis cluster (τ ∼ 3 Ma, d ∼ 385 pc) and yield constraints on the X-ray emission of brown dwarfs. Methods. We carried out a careful analysis of public data taken in an unexplored region to the west of the centre of the cluster with the three EPIC cameras onboard t...
متن کاملA Note on the Λ-structure on the Burnside Ring
Let G be a finite group and let S be a G-set. The Burnside ring of G has a natural structure of a λ-ring, {λ}n∈N. However, a priori λn(S), where S is a G-set, can only be computed recursively, by first computing λ1(S), . . . , λn−1(S). In this paper we establish an explicit formula, expressing λn(S) as a linear combination of classes of G-sets.
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 1998
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as98070