Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLA Observations of HI in the Circumstellar Envelopes of AGB Stars   We present the results of a VLA search for HI emission in the circumstellar
envelopes of five nearby AGB stars: RS Cnc, IRC+10216, EP Aqr, R Cas, and R
Aqr. We have detected emission coincident in both position and velocity with RS
Cnc, implying that the emission arises from its extended envelope. For R Cas,
we detected weak emission that peaks at the stellar systemic velocity and
overlaps with the location of its circumstellar dust shell and thus is probably
related to the star. Toward IRC+10216 and EP Aqr, we detected multiple,
arcminute-scale HI emission features at velocities consistent with the
circumstellar envelopes, but spatially offset from the stellar positions; in
these cases we cannot determine unambiguously if the emission is associated
with the stars. In the case of IRC+10216, we were unable to confirm the
detection of HI in absorption against the cosmic background previously reported
by Le Bertre & Gerard. We detected our fifth target, R Aqr (a symbiotic
binary), in the 1.4 GHz continuum.

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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg