SIMBAD references

2006ApJ...650..892S - Astrophys. J., 650, 892-900 (2006/October-3)

The unusual Spitzer spectrum of the carbon star IRAS 04496-6958: a different condensation sequence in the LMC?

SPECK A.K., CAMI J., MARKWICK-KEMPER C., LEISENRING J., SZCZERBA R., DIJKSTRA C., VAN DYK S. and MEIXNER M.

Abstract (from CDS):

We present a new Spitzer Infrared Spectrograph (IRS) spectrum of the carbon star IRAS 04496-6958 in the Large Magellanic Cloud, which exhibits a fairly broad absorption feature at ∼11 µm. This feature is consistent with SiC absorption, as seen in a few Galactic sources. Furthermore, the C2H2(and other molecular) absorption bands are the deepest ever observed, indicative of a very high column density. While the Galactic sources with SiC absorption have cool colors (continuum temperature ~300 K), IRAS 04496-6958 is much bluer, with a continuum temperature of ~600 K. Based on the Galactic sample, SiC dust at this temperature should still display an emission feature at ∼11 µm. If SiC is the cause of the absorption feature, it suggests a subtly different evolutionary path and a change to a different condensation sequence than assumed for Galactic carbon stars. An alternative explanation for this feature is molecular line absorption; however, currently available line lists are not sufficient to properly assess this hypothesis.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - ISM: Dust, Extinction - Infrared: Stars - Stars: Carbon - stars: individual (IRAS 04496-6958)

CDS comments: In text, several misprints in IRAS identifiers

Simbad objects: 13

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2019.11.12-15:32:46

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