Dust temperature and density profiles of AGB and post-AGB stars from mid-infrared observations

Details Dust temperature and density profiles of AGB and post-AGB stars from mid-infrared observations Dust temperature and density profiles of AGB and post-AGB stars from mid-infrared observations

2004-11-26

arxiv.org/abs/astro-ph/0411736v2

Astronomy and Astrophysics

Astrophysics

accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20041553

First mid-infrared images of a sample of AGB and post-AGB carbon stars (V Hya, IRC +10216, CIT 6 and Roberts 22) obtained at La Silla Observatory (ESO, Chile) are reported. CIT 6 presents a cometary-like feature clearly seen in the 9.7$\mu$m image, Roberts 22 shows an envelope slightly elongated in the north-east direction while images of V Hya and IRC+10216 are roughly spherically symmetric. Using inversion technique, the dust emissivity was derived from the observed intensity profiles, allowing a determination of the grain temperature and density distributions inside the envelope for these stars. Dust masses and mass-loss rates were estimated for V Hya and IRC +10216. Our results are comparable to those obtained in previous studies if dust grains have dimensions in the range $\sim$ 0.01 - 0.2 $\mu$m. Color maps suggest the presence of temperature inhomogeneities in the central regions of the dust envelopes. In the case of V Hya, an eccentric hot point, which direction coincides with the jet previously seen in [SII] emission, suggest that we are observing a material ejected in a previous mass-loss event. Bipolar lobes are clearly seen in the color maps of Roberts 22 and IRC +10216.

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