The nature of the unusual source IRAS 18530+0817.

Details The nature of the unusual source IRAS 18530+0817. The nature of the unusual source IRAS 18530+0817.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..442w&link_type=abstract

Astronomy and Astrophysics, v.323, p.442-448

Astronomy and Astrophysics

Astrophysics

3

Circumstellar Matter, Stars: Individual: Iras 18530+0817, Stars: Evolution, Stars: Mass-Loss, Stars: Agb And Post-Agb, Infrared: Stars

Scientific paper

Infrared photometry and spectroscopy of the unassociated (infrared-only) IRAS source, IRAS 18530+0817, indicate that it is a highly unusual evolved star surrounded by a dense envelope of cool gas and dust. The IRAS data reveal a large infrared excess and significant flux variability in the 12-25μm region, as well as a prominent, silicate emission feature at 8.5-11.5μm. The shape of the feature also appears to vary; in 1993 it was apparently attenuated by an absorption with a sharp edge at 9.5μm, which may be circumstellar or photospheric in origin. At other times the silicate feature appears to be self-absorbed by varying amounts. Near-infrared spectra of IRAS 18530+0817 are dominated by steam absorptions, with the K-band spectrum showing only a narrow band of relatively unabsorbed continuum at 2.15-2.29μm. The object appears to possess the strongest stellar photospheric H_2_O absorptions yet observed. We tentatively conclude that the central star of IRAS 18530+0817 is a late-type, O-rich, AGB star (a Mira variable) surrounded by an envelope of O-rich dust.

Affiliated with

Also associated with

No associations

Rating

The nature of the unusual source IRAS 18530+0817. 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 The nature of the unusual source IRAS 18530+0817., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The nature of the unusual source IRAS 18530+0817. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1183761