J/ApJ/517/264 Extinction in the Taurus dark cloud complex (Arce+, 1999)
An extinction study of the Taurus dark cloud complex
Arce H.G., Goodman A.A.
<Astrophys. J. 517, 264 (1999)>
=1999ApJ...517..264A 1999ApJ...517..264A
ADC_Keywords: Extinction ; Interstellar medium ; Photometry
Keywords: dust, extinction - infrared: ISM: continuum - ISM: individual
(Taurus Dark Cloud) - techniques: photometric - techniques:
spectroscopic
Abstract:
We present a study of the detailed distribution of extinction in a
region of the Taurus dark cloud complex. Our study uses new BVR images
of the region, spectral classification data for 95 stars, and IRAS Sky
Survey Atlas (ISSA) 60 and 100 µm images. We study the extinction
of the region in four different ways, and we present the first
intercomparison of all these methods, which are as follows: (1) using
the color excess of background stars for which spectral types are
known, (2) using the ISSA 60 and 100 µm images, (3) using star
counts, and (4) using an optical (V and R) version of the average
color excess method used by Lada et al. We find that all four methods
give generally similar results - with important exceptions. As
expected, all the methods show an increase in extinction due to dense
dusty regions (i.e., dark clouds and IRAS cores) and a general
increase in extinction with increasing declination, due to a larger
content of dust in the northern regions of the Taurus dark cloud
complex. Some of the discrepancies between the methods are caused by
assuming a constant dust temperature for each line of sight in the
ISSA extinction maps and not correcting for unexpected changes in the
background stellar population (i.e., the presence of a cluster or
Galactic gradients in the stellar density and average V-R color).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 95 Photometric and spectroscopic data
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See also:
J/A+AS/101/485 : Multisite UBVRI photometry in Tau-Aur cloud (Bouvier+ 1993)
J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Object name
14 I1 h RAh Right Ascension (J2000)
16- 17 I2 min RAm Right Ascension (J2000)
19- 22 F4.1 s RAs Right Ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 37 F5.2 mag Vmag V band magnitude
39- 42 F4.2 mag e_Vmag Uncertainty in Vmag
44- 47 F4.2 mag B-V (B-V) color
49- 52 F4.2 mag e_B-V Uncertainty in B-V
54- 55 A2 --- SpType Spectral type
57- 60 F4.2 mag E(B-V) E(B-V) reddening value
62- 65 F4.2 mag Av Extinction in the V band
67- 70 F4.2 mag e_Av Uncertainty in Av
72- 75 I4 pc Dist Distance
77- 79 I3 pc e_Dist Uncertainty in Dist
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References:
Lada, C. J., Lada, E. A., Clemens, D. P., & Bally, J. 1994, ApJ,
429, 69 (1994ApJ...429..694L 1994ApJ...429..694L)
(End) Greg Schwarz [AAS] 07-Mar-2000