The detection of iron sulfides in Planetary Nebulae

Details The detection of iron sulfides in Planetary Nebulae The detection of iron sulfides in Planetary Nebulae

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393l.103h&link_type=abstract

Astronomy and Astrophysics, v.393, p.L103-L106 (2002)

Astronomy and Astrophysics

Astrophysics

15

Circumstellar Matter, Planetary Nebulae: Individual: Pn M2-43, Pn K3-17, Stars: Mass-Loss

Scientific paper

We present and discuss the detection, through mid IR spectroscopy, of iron sulfides in the carbon rich ejecta of evolved stars. We find the spectroscopic signature of iron sulfides at 23 mu m. We also find weak features at ~ 34, 38 and 44 mu m. The positions of these features correspond well with the resonances of the iron sulfide troilite. However, the relative strength of the 23 mu m versus the other bands does not match the laboratory measurements, which suggests the presence of other iron sulfides besides troilite. The same broad feature around 23 mu m has been found in young stellar objects. This detection may imply a carbon star origin for part of the iron sulfides found in meteorites and interplanetary dust particles. Based on observations obtained with ISO, an ESA project with instruments funded by ESA Member states (especially the PI countries: France, Germany, The Netherlands and the UK) with the participation of ISAS and NASA.

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