J/A+A/430/421 Reddening in LMC bar region (Subramaniam, 2005)
Reddening map of the Large Magellanic Cloud bar region.
Subramaniam, A.
<Astron. Astrophys. 430, 421 (2005)>
=2005A&A...430..421S 2005A&A...430..421S
ADC_Keywords: Magellanic Clouds ; Reddening
Keywords: galaxies: Magellanic Clouds - udst, extinction
Abstract:
E(V-I) reddening values for 1123 locations in the bar region of the
Large Magellanic Cloud are presented. V, I photometry of red clump
stars identified in the Optical Gravitational Lensing Experiment II
(OGLE-II) catalogue of LMC were used to estimate reddening. E(V-I)
values were estimated as the difference between observed and the
characteristic values of (V-I) for the red clump population in a given
region. It is found that most of the regions in the bar have reddening
values less than 0.1mag with only a few locations having values more
than 0.2mag. The eastern side of the bar is found to be more reddened
when compared to the western side, with similar and relatively small
values for differential reddening as in most parts of the bar.
Increased reddening in the eastern end of the bar could be caused by a
small fraction of the H I clouds in the line of sight. A high density
of HI clouds located in the eastern end of the bar should have caused
very high reddening in these regions, whereas only a relatively small
increase in the reddening is estimated. This indicates that most of
the H I clouds in this direction are likely to be located behind the
bar.
Description:
E(V-I) reddening values estimated for 1123 locations in the LMC are
tabulated. Each value corresponds to an average reddening within an
area of 3.56x3.56arcmin2. Peak values of the red clump distribution
in (V-I) colour at each location was estimated and the reddening was
calculated using the relation E(V-I)=(V-I)(obs)-0.92mag. The
intrinsic colour of red clump stars was assumed to be 0.92mag (Olsen &
Salyk, 2002AJ....124.2045O 2002AJ....124.2045O).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 38 1123 E(V-I) reddening values for 1123 locations
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See also:
ftp://sirius.astrouw.edu.pl/ogle/ogle2 : OGLE II Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 3 I2 h RAh Right ascension (J2000.0)
5- 6 I2 min RAm Right ascension (J2000.0)
8- 9 I2 s RAs Right ascension (J2000.0)
12 A1 --- DE- Declination sign (J2000.0)
13- 14 I2 deg DEd Declination (J2000.0)
16- 17 I2 arcmin DEm Declination (J2000.0)
19- 20 I2 arcsec DEs Declination (J2000.0)
24- 29 F6.3 mag E(V-I) Reddening
34- 38 F5.3 mag e_E(V-I) Error in the reddening
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Acknowledgements: Annapurni Subramaniam, purni(at)iiap.res.in
(End) Patricia Vannier [CDS] 05-Oct-2004