Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334..585r&link_type=abstract
Astronomy and Astrophysics, v.334, p.585-591 (1998)
Astronomy and Astrophysics
Astrophysics
6
Occultations, Stars: Carbon, Stars: Circumstellar Matter, Stars: Fundamental Parameters, Infrared:Stars
Scientific paper
We present first-time investigations, by means of several different techniques in the visual and infrared domains, of the source 06088+1909, discovered by the IRAS satellite and classified as a carbon star on the basis of a SiC emission feature. Our interest for this source started with two lunar occultation events, which showed the presence of extended circumstellar emission on the scale of ~0farcs01 . Follow-up observations by photometry, polarimetry, spectroscopy, speckle interferometry and two more lunar occultations, have revealed many interesting characteristics, and in particular the presence of a flattened shell around the central star. By combining together all available observational evidence, we have been able to infer some of the properties of this shell, such as its shape, size, temperature of the grains, and mechanism of polarization. The object appears as one more example of the complexity existing in the environments of late-type giants and AGB stars, similar to well-known cases such as the Egg Nebula and the Red Rectangle. In the case of IRAS 06088+1909, it has been possible to conduct such a study at an unprecedented level of angular resolution. Based on observations collected at TIRGO (Gornergrat, Switzerland), and at Calar Alto (Spain). TIRGO is operated by CNR-CAISMI Arcetri, Italy. Calar Alto is operated by the German-Spanish Astronomical Center.
Herbst Thomas M.
Lagage Pierre Olivier
Richichi Andrea
Stecklum Bringfried
Thamm E.
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