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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 95 Photometric and spectroscopic data
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
Bytes Format Units Label Explanations
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
References: Lada, C. J., Lada, E. A., Clemens, D. P., & Bally, J. 1994, ApJ, 429, 69 (1994ApJ...429..694L)
(End) Greg Schwarz [AAS] 07-Mar-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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