منابع مشابه
Molecular abundances in carbon-rich circumstellar envelopes
A millimetre molecular line survey of seven high mass-loss rate carbon stars in both the northern and southern skies is presented. A total of 196 emission lines (47 transitions) from 24 molecular species were detected. The observed CO emission is used to determine mass-loss rates and the physical structure of the circumstellar envelope, such as the density and temperature structure, using a det...
متن کاملWater vapour in circumstellar envelopes
We present observations of the 313 →220 line of p-H2O at 183 GHz in the direction of the circumstellar envelopes of 23 O–rich evolved stars. The 183 GHz data are complemented with observations of CO J=2 →1, p-H2O 515 →422 at 325 GHz, o-H2O 616 →523 at 22 GHz and SiO v=1 J=2 →1. The line profiles of these transitions are compared and discussed in terms of the regions where they are formed. We ha...
متن کاملInfrared interferometry of circumstellar envelopes
This paper will review the technical progress of interferometric infrared observing techniques from the first 2-element interferometer 25 years ago to the 3+ element arrays now coming into service. To date, only the Infrared Spatial Interferometer (ISI) has published separateelement interferometric data on circumstellar dust shells in the infrared and many of these scientific results will be di...
متن کاملA survey of CN in circumstellar envelopes
We have conducted a survey of CN N=2–1 and N=1–0 line emission in the envelopes of evolved stars. The sample consists of 42 objects, including C-rich and O-rich envelopes, S-stars, detached envelopes, and proto-planetary nebulae. Confident detections have been achieved in 30 objects. Both CN lines are bright in C-rich envelopes, and the 2–1 line has been detected in 5 O-rich objects (previously...
متن کاملStellar Masers, Circumstellar Envelopes, and Supernova Remnants
This paper reviews recent advances in the study or circumstellar masers and masers found toward supernova remnants. The review is organized by science focus area, including the astrophysics of extended stellar atmospheres, stellar mass-loss processes and outflows, late-type evolved stellar evolution, stellar maser excitation and chemistry, and the use of stellar masers as independent distance e...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1997
ISSN: 0074-1809
DOI: 10.1017/s0074180900061891