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Red variables in the OGLE-II data base - III. Constraints on the three-dimensional structures of the Large and Small Magellanic Clouds

Lah, Philip; Kiss, L L; Bedding, Timothy Russell

Description

We present an analysis of the 3D structure of the Magellanic Clouds, using period-luminosity (P-L) relations of pulsating red giants in the OGLE-II sample. By interpreting deviations from the mean P-L relations as distance modulus variations, we examine the 3D distributions of the sample. The results for the Large Magellanic Cloud, based solely on stars below the tip of the Red Giant Branch (LMC), confirm previous results on the inclined and possibly warped bar of the LMC. The depth variation...[Show more]

dc.contributor.authorLah, Philip
dc.contributor.authorKiss, L L
dc.contributor.authorBedding, Timothy Russell
dc.date.accessioned2015-12-13T22:36:14Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/76670
dc.description.abstractWe present an analysis of the 3D structure of the Magellanic Clouds, using period-luminosity (P-L) relations of pulsating red giants in the OGLE-II sample. By interpreting deviations from the mean P-L relations as distance modulus variations, we examine the 3D distributions of the sample. The results for the Large Magellanic Cloud, based solely on stars below the tip of the Red Giant Branch (LMC), confirm previous results on the inclined and possibly warped bar of the LMC. The depth variation across the OGLE-II field is about 2.4 kpc, interpreted as the distance range of a thin but inclined structure. The inclination angle is about 29°. A comparison with OGLE-II red clump distances revealed intriguing differences that seem to be connected to the red clump reddening correction. A spatially variable red clump population in the LMC can explain the deviations, which may have a broader impact on our understanding of the LMC formation history. For the Small Magellanic Cloud, we find a complex structure showing patchy distribution scattered within 3.2 kpc of the mean. However, the larger range of the overall depth on every line-of-sight is likely to smooth out significantly the real variations.
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Magellanic clouds; Stars: AGB and post-AGB; Stars: late-type; Stars: oscillations; Stars: variables: other
dc.titleRed variables in the OGLE-II data base - III. Constraints on the three-dimensional structures of the Large and Small Magellanic Clouds
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume359
dc.date.issued2005
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub5472
local.type.statusPublished Version
local.contributor.affiliationLah, Philip, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKiss, L L, University of Sydney
local.contributor.affiliationBedding, Timothy Russell , University of Sydney
local.description.embargo2037-12-31
local.bibliographicCitation.startpageL42
local.bibliographicCitation.lastpageL46
local.identifier.doi10.1111/j.1745-3933.2005.00033.x
dc.date.updated2015-12-11T09:30:39Z
local.identifier.scopusID2-s2.0-27944433516
CollectionsANU Research Publications

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