Constraining dust extinction properties via the VVV survey

D. Majaess, D. Turner, I. Dékány, D. Minniti, W. Gieren

Resultado de la investigación: Article

15 Citas (Scopus)

Resumen

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) μm 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 and Galactocentric distance (<E(J - 3:5 μm)=E(J - Ks)i = 1:28 ± 0:03). The results derived imply that classical Cepheids and O stars display separate optical trends (RV;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 <AJ=E(J - Ks)> = <RJ;JKs > = 1:49 ± 0:05 (<AKs =AJ> = 0:33 ± 0:02), whereas the O stars are expectedly impacted by emission beyond 3:6 μm. The mean optical ratios characterizing classical Cepheids and O stars are approximately <RV;BV > ∼ 3:1 and <RV;BV > ∼ 3:3, respectively.

Idioma originalEnglish
Número de artículoA124
PublicaciónAstronomy and Astrophysics
Volumen593
DOI
EstadoPublished - 1 sep 2016

Huella dactilar

O stars
near infrared
extinction
dust
galaxies
color
stars
longitude

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Majaess, D. ; Turner, D. ; Dékány, I. ; Minniti, D. ; Gieren, W. / Constraining dust extinction properties via the VVV survey. En: Astronomy and Astrophysics. 2016 ; Vol. 593.
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Constraining dust extinction properties via the VVV survey. / Majaess, D.; Turner, D.; Dékány, I.; Minniti, D.; Gieren, W.

En: Astronomy and Astrophysics, Vol. 593, A124, 01.09.2016.

Resultado de la investigación: Article

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AU - Minniti, D.

AU - Gieren, W.

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