Detection of an 0.1 pc Dust Shell of the Carbon Star U Hydrae in Optical Light

Details Detection of an 0.1 pc Dust Shell of the Carbon Star U Hydrae in Optical Light Detection of an 0.1 pc Dust Shell of the Carbon Star U Hydrae in Optical Light

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..378..305i&link_type=abstract

Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. ASP Conference Series, Vol. 378, proceedings of the co

Astronomy and Astrophysics

Astronomy

2

Scientific paper

A very extended circumstellar shell is detected around the carbon star U Hya in the V band. The shell looks circular and the radial profile of its brightness shows a clear maximum at ˜115 arcsec followed by a rapid decline to the rim at ˜130 arcsec (0.1 pc), which indicates the shell is probably spherical and geometrically thin. The dust mass in the shell is estimated to be ˜10-5 M_&sun; assuming some simple dust grain properties and that the shell is seen in the scattered light of the central star. Because no such extended CO gas shell is present in U Hya, this becomes the first instance of an opitical dust shell detected far beyond the CO photo-dissociation radius in an AGB star.

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