Constraining dust extinction properties via the VVV survey

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dc.creator Majaess, Daniel J.
dc.creator Turner, David Gerald, 1945-
dc.creator Dékány, I.
dc.creator Minniti, D.
dc.creator Gieren, W.
dc.date.accessioned 2018-01-18T16:03:59Z
dc.date.available 2018-01-18T16:03:59Z
dc.date.issued 2016-10
dc.identifier.issn 0004-6361
dc.identifier.uri http://library2.smu.ca/handle/01/27246
dc.description Publisher's Version/PDF
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 BVJHK[subscript s](3.4 [right arrow] 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 ([left angle bracket]E(J - 3.5 [micrometre])/E(J-K[subscript s])[right angle bracket] = 1.28 [plus or minus] 0:03). The results derived imply that classical Cepheids and O stars display separate optical trends (R[subscript V,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 [left angle bracket]A[subscript J]/E(J - K[subscript s])[right angle bracket] = [left angle bracket]R[subscript J,JK[subscript s]][right angle bracket] = 1.49 [plus or minus] 0:05 ([left angle bracket]A[subscript K[subscript s]]/A[subscript J][right angle bracket] = 0.33 [plus or minus] 0.02), whereas the O stars are expectedly impacted by emission beyond 3.6 [micrometre]. The mean optical ratios characterizing classical Cepheids and O stars are approximately R[subscript V,BV] ~ 3.1 and R[subscript V,BV] ~ 3.3, respectively. en_CA
dc.language.iso en en_CA
dc.publisher EDP Sciences en_CA
dc.relation.uri https://doi.org/10.1051/0004-6361/201628763
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Interstellar reddening
dc.subject.lcsh Cosmic dust
dc.title Constraining dust extinction properties via the VVV survey en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomy & Astrophysics 593, A124. (2016) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: https://doi.org/10.1051/0004-6361/201628763
 
 

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