Discovery of Parsec-sized Dust Shells around AFGL 2688 and AFGL 618

Details Discovery of Parsec-sized Dust Shells around AFGL 2688 and AFGL 618 Discovery of Parsec-sized Dust Shells around AFGL 2688 and AFGL 618

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...545l.145s&link_type=abstract

The Astrophysical Journal, Volume 545, Issue 2, pp. L145-L148.

Astronomy and Astrophysics

Astronomy

32

Stars: Circumstellar Matter, Infrared: Stars, Stars: Agb And Post-Agb, Stars: Evolution, Stars: Mass Loss, Stars: Winds, Outflows

Scientific paper

We present ISOPHOT linear scans of two carbon-rich proto-planetary nebulae, AFGL 2688 and AFGL 618. The 53'×3' scans were made with the ISO AOT PHT32 using the 120 and 180 μm filters. Both these objects appear to have very bright central point sources together with extremely extended (radius ~350"-400") dust shells with brightnesses of ~10% of the peak brightness of the point source. Assuming constant expansion velocities, ages for these dust shells are of the order of 105 yr. The infrared intensities do not fall off smoothly with radius as one would expect for constant or even steadily increasing mass-loss rates. Rather, AFGL 2688 and AFGL 618 both show enhanced emission at 150" and 300" and 160" and 275", respectively. These ``periodic'' enhancements indicate episodic variations in the mass loss with timescales (few times 104 yr) that appear to coincide with thermal pulses on the asymptotic giant branch. Comparison of these timescales with theoretical calculations suggest a progenitor main-sequence mass of ~3 Msolar for both AFGL 2688 and AFGL 618.

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