Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319..111l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 1, pp. 111-120.
Astronomy and Astrophysics
Astronomy
5
Stars: Carbon, Circumstellar Matter, Stars: Individual: Iras 12311-3509, Ism: Molecules
Scientific paper
The optical spectrum of the carbon star IRAS 12311-3509 is dominated by the Merrill-Sanford emission bands of SiC2, by absorption and emission in the Swan system of C2, and by resonance emission lines of neutral metals. The infrared energy distribution is flat from 1 to 60μm. These observations are interpreted as arising from a star with a cool dusty disc which is edge-on to the observer and obscures direct starlight. The infrared continuum is caused predominantly by absorption of stellar light by dust in the disc and re-emission at longer wavelengths. The optical stellar spectrum is seen by reflection off dusty material which lies out of the plane of the disc, and the molecular and atomic emission arises in the same geometry through resonance fluorescence. The object has similarities to the J-silicate stars, but may have a carbon-rich rather than oxygen-rich disc. A full spectroscopic assignment and discussion of the SiC2 bands and their intensities are given. Modelling of the rotational contours of the 000 band yields a rotational temperature of 250K, indicating very cool gas.
Evans Tom Lloyd
Hurst M. E.
Sarre Peter J.
No associations
LandOfFree
IRAS 12311-3509: a carbon star with SiC2 emission does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with IRAS 12311-3509: a carbon star with SiC2 emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IRAS 12311-3509: a carbon star with SiC2 emission will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1112812