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The Keck Aperture Masking Experiment: Spectro-Interferometry of Three Mira Variables from 1.1 to 3.8 μm

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dc.contributor.authorWoodruff, H. C
dc.contributor.authorIreland, Michael
dc.contributor.authorTuthill, Peter G
dc.contributor.authorMonnier, J. D
dc.contributor.authorBedding, Timothy Russell
dc.contributor.authorDanchi, W. C
dc.contributor.authorScholz, M
dc.contributor.authorTownes, C. H
dc.contributor.authorWood, Peter R
dc.date.accessioned2015-12-08T22:25:09Z
dc.date.issued2009
dc.date.updated2016-02-24T09:53:29Z
dc.description.abstractWe present results from a spectro-interferometric study of the Miras o Cet, R Leo, and W Hya obtained with the Keck Aperture Masking Experiment from 1998 September to 2002 July. The spectrally dispersed visibility data permit fitting with circularly symmetric brightness profiles such as a simple uniform disk (UD). The stellar angular diameter obtained over up to ∼ 450 spectral channels spanning the region 1.1-3.8 μm is presented. Use of a simple UD brightness model facilitates comparison between epochs and with existing data and theoretical models. Strong size variations with wavelength were recorded for all stars, probing zones of H2O, CO, OH, and dust formation. Comparison with contemporaneous spectra extracted from our data shows a strong anticorrelation between the observed angular diameter and flux. These variations consolidate the notion of a complex stellar atmosphere consisting of molecular shells with time-dependent densities and temperatures. Our findings are compared with existing data and pulsation models. The models were found to reproduce the functional form of the wavelength versus angular diameter curve well, although some departures are noted in the 2.8-3.5 μm range.
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/33312
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Instrumentation: interferometers; Stars: AGB and post-AGB; Stars: individual (Mira W Hya R Leo); Techniques: interferometric
dc.titleThe Keck Aperture Masking Experiment: Spectro-Interferometry of Three Mira Variables from 1.1 to 3.8 μm
dc.typeJournal article
local.bibliographicCitation.issue2
local.bibliographicCitation.lastpage1336
local.bibliographicCitation.startpage1328
local.contributor.affiliationWoodruff, H C, University of Sydney
local.contributor.affiliationIreland, M J, University of Sydney
local.contributor.affiliationTuthill, Peter G, University of Sydney
local.contributor.affiliationMonnier, J. D. , University of Michigan
local.contributor.affiliationBedding, Timothy Russell , University of Sydney
local.contributor.affiliationDanchi, W. C., NASA Goddard Space Flight Center
local.contributor.affiliationScholz, M, University of Sydney
local.contributor.affiliationTownes, C. H., University of California at Berkeley
local.contributor.affiliationWood, Peter R, College of Physical and Mathematical Sciences, ANU
local.contributor.authoruidWood, Peter R, u7900259
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu3356449xPUB101
local.identifier.citationvolume691
local.identifier.doi10.1088/0004-637X/691/2/1328
local.identifier.scopusID2-s2.0-70349649450
local.identifier.thomsonID000263304300035
local.type.statusPublished Version

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