2013A&A...556A..48S


Query : 2013A&A...556A..48S

2013A&A...556A..48S - Astronomy and Astrophysics, volume 556A, 48-48 (2013/8-1)

Reddening behaviors of young stellar objects in Spitzer/IRAC bands.

SIM C.K., KIM S.S., LEE J.-E. and KIM S.J.

Abstract (from CDS):

We investigate the reddening behaviors of young stellar objects (YSOs) in the photometric system of the InfraRed Array Camera (IRAC) onboard the Spitzer Space Telescope. We constructed a couple of model extinction laws for the IRAC wavelength range that are composed of a power-law function and a 9.7µm absorption bump by silicates. We then calculated reddened colors of the YSOs in 3 different evolutionary stages with various masses and disk inclinations by convolving the adopted model spectral energy distributions (SEDs) with the spectral response functions of the IRAC bands for KS-band extinction values of up to 8 mag. We find that the reddening vectors of YSOs in the [3.6]-[4.5] vs. [5.8]-[8.0] diagrams are considerably SED-dependent and can be highly nonlinear in some cases. Many YSOs show a ``bluening'' (as opposed to the reddening) in the [5.8]-[8.0] color owing to the 9.7µm bump in the extinction law. Our findings imply that dereddening in a color-color or color-magnitude diagram involving the [8.0] band might be highly unreliable unless the SED of the source and the extinction law are at least approximately known.

Abstract Copyright:

Journal keyword(s): dust, extinction - infrared: ISM - stars: formation - techniques: photometric

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Ori A MoC 05 38 -07.1           ~ 2862 0
2 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1113 1
3 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 362 0
4 GUM 29 HII 10 24 14.6 -57 46 58           ~ 199 0
5 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3376 1
6 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1021 2

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2022.08.18-04:23:32

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