The distribution of dust around Asymptotic Giant Branch stars

Details The distribution of dust around Asymptotic Giant Branch stars The distribution of dust around Asymptotic Giant Branch stars

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..445v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. 445-458

Astronomy and Astrophysics

Astronomy

33

Asymptotic Giant Branch Stars, Cosmic Dust, Far Infrared Radiation, Infrared Astronomy, Infrared Spectra, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Astronomical Maps, Infrared Stars, Near Infrared Radiation, Spectral Energy Distribution

Scientific paper

A sample of 13 Asymptotic Giant Branch stars (ACB stars) were observed in the submm continuum at 761 and 1100 micrometers with the James Clerk Maxwell Telescope (JCMT, Mauna Kea, Hawaii). Eleven sources were detected in at least one of the two wavelength bands. Mapping observations were attempted for five sources. Some of our sources were also measured at 1250 micrometers by Walmsley et al. (1991) and good agreement was found except for three sources: IRC+10216, W Hya and OH26.5+0.6. The differences for IRC+10216, however, can be understood as caused by a rather steep density law in its dust shell; for W Hya there is evidence for submm variability. The radial dust distribution in the circumstellar envelopes was derived by combining the submm observations with near IR and IRAS observations obtained from the literature and by fitting the data with an optically thin and spherically symmetric dust shell model. In addition, for three sources the extended emission was modeled as a function of angular distance from the star. For five sources evidence was found for gradual changes in the mass loss rate. Four AGB stars have submm fluxes in excess by a factor of 3-5 larger compared to what can be explained with one dust shell. Various explanations are discussed.

Affiliated with

Also associated with

No associations

Rating

The distribution of dust around Asymptotic Giant Branch stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The distribution of dust around Asymptotic Giant Branch stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distribution of dust around Asymptotic Giant Branch stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-881290