Volume 366, Number 3, February II 2001
|Page(s)||923 - 929|
|Section||Interstellar and circumstellar matter|
|Published online||15 February 2001|
IRAS 09425-6040: A carbon star surrounded by highly crystalline silicate dust
Astronomical Institute "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
2 The Institute of Space and Astronautical Science, Yoshino-dai 3-1-1, Sagamihara, Kanagawa 229-8510, Japan
3 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
4 European Southern Observatory, Casilla 19001, Santiago 19, Chile
5 Onsala Space Observatory, 439 92 Onsala, Sweden
6 SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
7 Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France
Corresponding author: F. J. Molster, email@example.com
Accepted: 16 November 2000
We present infrared spectroscopy and millimeter photometry and spectroscopy of the peculiar carbon star IRAS 09425-6040. The 2-15 μm spectrum, as well as the CO millimeter line observations are typical for a (J-type) carbon star with moderate mass-loss rate. The 15-45 μm spectrum is dominated by strong emission bands from Mg-rich and Fe-poor crystalline silicates. IRAS 09425-6040 has the highest abundance of crystalline silicates (75 per cent) observed in any source so far. The ISO data, combined with IRAS and millimeter wavelength photometry indicate the presence of large cold grains. The observations indicate that the carbon star IRAS 09425-6040 is surrounded by a stationary, massive, highly crystalline oxygen-rich dust disk which is depleted of gas. These properties are very similar to those of the disk seen in the Red Rectangle. We propose that IRAS 09425-6040 is the evolutionary progenitor of the central binary of the Red Rectangle nebula.
Key words: infrared: stars / stars: AGB and post-AGB; mass loss / planetary nebulae: general / dust, extinction
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.