Molecular Abundances in IRC+10216
نویسندگان
چکیده
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...
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The first definite discoveries of extragalactic deuterium are reported. DCO has been detected in three and DCN has been measured in one star-forming region of the Large Magellanic Cloud (LMC). While the HCO/DCO abundance ratios are found to be 19± 3, 24 ± 4, and 67 ± 18 for N113, N44BC and N159HW, respectively, a HCN/DCN abundance ratio of 23 ± 5 is obtained for N113. These results are consiste...
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High quality archival spectra of interstellar absorption from C I toward 9 stars, taken with the Goddard High Resolution Spectrograph on the Hubble Space Telescope, were analyzed. Our sample was supplemented by two sight lines, 23 Ori and β Sco, for which the C I measurements of Federman, Welty, & Cardelli were used. Directions with known CH absorption, but only upper limits on absorption from ...
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Cell reproduction involves replication of diverse molecule species, in contrast to simple replication system with fewer components. Here, we address why such diversity is sustained despite the efficiency of simple replication systems, using a cell model with catalytic reaction dynamics that grew by uptake of environmental resources. Limited resources led to increased diversity of components wit...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1980
ISSN: 0074-1809
DOI: 10.1017/s0074180900073125