The Keck Aperture Masking Experiment: dust‐enshrouded red giants
dc.contributor.author | Blasius, T. D. | en_US |
dc.contributor.author | Monnier, J. D. | en_US |
dc.contributor.author | Tuthill, P. G. | en_US |
dc.contributor.author | Danchi, W. C. | en_US |
dc.contributor.author | Anderson, M. | en_US |
dc.date.accessioned | 2012-11-07T17:04:26Z | |
dc.date.available | 2014-01-07T14:51:07Z | en_US |
dc.date.issued | 2012-11-11 | en_US |
dc.identifier.citation | Blasius, T. D.; Monnier, J. D.; Tuthill, P. G.; Danchi, W. C.; Anderson, M. (2012). "The Keck Aperture Masking Experiment: dust‐enshrouded red giants." Monthly Notices of the Royal Astronomical Society 426(4): 2652-2667. <http://hdl.handle.net/2027.42/94230> | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.issn | 1365-2966 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/94230 | |
dc.description.abstract | While the importance of dusty asymptotic giant branch (AGB) stars to galactic chemical enrichment is widely recognized, a sophisticated understanding of the dust formation and wind‐driving mechanisms has proven elusive due in part to the difficulty in spatially resolving the dust‐formation regions themselves. We have observed 20 dust‐enshrouded AGB stars as part of the Keck Aperture Masking Experiment, resolving all of them in multiple near‐infrared bands between 1.5 and 3.1 μm. We find 45 per cent of the targets to show measurable elongations that, when correcting for the greater distances of the targets, would correspond to significantly asymmetric dust shells at par with the well‐known cases of IRC + 10216 or CIT 6. Using radiative transfer models, we find the sublimation temperature of T sub (silicates) = 1130 ± 90 K and T sub (amorphous carbon) = 1170 ± 60 K, both somewhat lower than expected from laboratory measurements and vastly below temperatures inferred from the inner edge of young stellar objects discs. The fact that O‐rich and C‐rich dust types showed the same sublimation temperature was surprising as well. For the most optically thick shells ( τ 2.2 μ m > 2 ), the temperature profile of the inner dust shell is observed to change substantially, an effect we suggest could arise when individual dust clumps become optically thick at the highest mass‐loss rates. | en_US |
dc.publisher | Wiley Periodicals, Inc. | en_US |
dc.publisher | NASA | en_US |
dc.subject.other | Instrumentation: Interferometers | en_US |
dc.subject.other | Circumstellar Matter | en_US |
dc.subject.other | Radiative Transfer | en_US |
dc.title | The Keck Aperture Masking Experiment: dust‐enshrouded red giants | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/94230/1/mnr21543.pdf | |
dc.identifier.doi | 10.1111/j.1365-2966.2012.21543.x | en_US |
dc.identifier.source | Monthly Notices of the Royal Astronomical Society | en_US |
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