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Constraining dust extinction properties via the VVV survey

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dc.contributor.author Majaess, D
dc.contributor.author Turner, D
dc.contributor.author Dekany, I
dc.contributor.author Minniti, D
dc.contributor.author Gieren, W
dc.date.accessioned 2017-03-10T13:24:44Z
dc.date.available 2017-03-10T13:24:44Z
dc.date.issued 2016-09
dc.identifier.citation A&A 593, A124 (2016) es
dc.identifier.issn 1432-0746
dc.identifier.other https://doi.org/10.1051/0004-6361/201628763
dc.identifier.uri http://repositorio.unab.cl/xmlui/handle/ria/3058
dc.description Indexación: Web of Science es
dc.description.abstract Near-infrared color-excess and extinction ratios are essential for establishing the cosmic distance scale and probing the Galaxy, particularly when analyzing targets attenuated by significant dust. A robust determination of those ratios followed from leveraging new infrared observations from the VVV survey, wherein numerous bulge RR Lyrae and Type II Cepheids were discovered, in addition to BVJHKs(3.4 -> 22) mu m data for classical Cepheids and O stars occupying the broader Galaxy. The apparent optical color-excess ratios vary significantly with Galactic longitude (l), whereas the near-infrared results are comparatively constant with l and Galactocentric distance (E(J-(3.5 mu m) over bar /E(J - K-s) = 1.28 +/- 0.03. The results derived imply that classical Cepheids and O stars display separate optical trends (R-V,R-BV) with l, which appear to disfavor theories advocating a strict and marked decrease in dust size with increasing Galactocentric distance. The classical Cepheid, Type II Cepheid, and RR Lyrae variables are characterized by (A(J)/E(J-K-s) = (R-J,R-JKs) = 1.49 +/- 0.05 ((A(Ks)/A(J)) = 0.33 +/- 0.02), whereas the O stars are expectedly impacted by emission beyond 3.6 mu m. The mean optical ratios characterizing classical Cepheids and O stars are approximately (R-V,R-BV) similar to 3.1 and (R-V,R-BV) similar to 3.3, respectively. es
dc.description.uri http://www.aanda.org/articles/aa/abs/2016/09/aa28763-16/aa28763-16.html
dc.language.iso en es
dc.publisher EDP SCIENCES es
dc.subject LARGE-MAGELLANIC-CLOUD es
dc.subject GRAVITATIONAL LENSING EXPERIMENT es
dc.subject OGLE-III CATALOG es
dc.subject RR LYRAE STARS es
dc.subject MILKY-WAY es
dc.subject CLASSICAL CEPHEIDS es
dc.subject GALACTIC CEPHEIDS es
dc.subject LEAVITT LAW es
dc.subject DISTANCE es
dc.subject CURVE es
dc.title Constraining dust extinction properties via the VVV survey es
dc.type Article es


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