منابع مشابه
The Molecular Gas Environment around Two Herbig Ae/be Stars: Resolving the Outflows of Lkhα 198 and Lkhα 225s
Observations of outflows associated with pre-main-sequence stars reveal details about morphology, binarity and evolutionary states of young stellar objects. We present molecular line data from the Berkeley-Illinois-Maryland Association array and Five Colleges Radio Astronomical Observatory toward the regions containing the Herbig Ae/Be stars LkHα 198 and LkHα 225S. Single dish observations of C...
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In this contribution we investigate how a disk determines the physical and geometrical properties of the circumstellar environment of the T Tauri SU Aurigae. Our model of the spectral energy distribution of this star includes the central young star, a flat black disk and a diffuse envelope. We also describe the inner interaction region between the disk and the star, the magnetosphere, by analys...
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We summarize the analysis of a uniform set of both previously-known and newly-discovered scattered-light echoes, detected within 30 of SN 1987A in ten years of optical imaging, and with which we have constructed the most complete three-dimensional model of the progenitor’s circumstellar environment. Surrounding the SN is a richly-structured bipolar nebula. An outer, double-lobed “peanut,” which...
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We investigate properties of the interstellar medium (ISM) in galaxies hosting long-duration γ-ray bursts (GRBs) from an analysis of atomic species (Mg, Fe) and excited fine-structure levels of ions (e.g. Si). Our analysis is guided primarily by echelle observations of GRB 050730 and GRB 051111. These sightlines exhibit fine-structure transitions of O, Si, and Fe gas that have not yet been dete...
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I discuss the spectral energy distribution (SED) of the star PDS 144C, in regards to whether it is a member of the PDS 144 system. Looking at the data, I come to the conclusion that it is not a member of the system. Additionally, I perform point spread function (PSF) subtraction on the southern member of the system, PDS 144S, in an attempt to better resolve the disk and determine basic disk pro...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900095905