Empirical calibration of the reddening maps in the Magellanic Clouds. (arXiv:2001.08242v1 [astro-ph.GA])

Empirical calibration of the reddening maps in the Magellanic Clouds. (arXiv:2001.08242v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Gorski_M/0/1/0/all/0/1">Marek Gorski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zgirski_B/0/1/0/all/0/1">Bartlomiej Zgirski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pietrzynski_G/0/1/0/all/0/1">Grzegorz Pietrzynski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gieren_W/0/1/0/all/0/1">Wolfgang Gieren</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wielgorski_P/0/1/0/all/0/1">Piotr Wielgorski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Graczyk_D/0/1/0/all/0/1">Dariusz Graczyk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kudritzki_R/0/1/0/all/0/1">Rolf-Peter Kudritzki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pilecki_B/0/1/0/all/0/1">Bogumil Pilecki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Narloch_W/0/1/0/all/0/1">Weronika Narloch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Karczmarek_P/0/1/0/all/0/1">Paulina Karczmarek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Suchomska_K/0/1/0/all/0/1">Ksenia Suchomska</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Taormina_M/0/1/0/all/0/1">Monica Taormina</a>

We present reddening maps of the Large Magellanic Cloud (LMC) and Small
Magellanic Cloud (SMC), based on color measurements of the red clump. Reddening
values of our maps were obtained by calculating the difference of the observed
and intrinsic color of the red clump in both galaxies. To obtain the intrinsic
color of the red clump, we used reddenings obtained from late-type eclipsing
binary systems, measurements for blue supergiants and reddenings derived from
Str”{o}mgren photometry of B-type stars. We obtained intrinsic color of the
red clump $(V-I)_0$ = 0.838 $pm$ 0.034 mag in the LMC, and $(V-I)_{0}$ = 0.814
$pm$ 0.034 mag in the SMC. We prepared our map with 3 arcmin resolution,
covering the central part of the LMC and SMC. The mean value of the reddening
is E$(B-V)_{mathrm{LMC}}$=0.127 mag and E$(B-V)_{mathrm{SMC}}$=0.084 mag for
the LMC and SMC, respectively. The systematic uncertainty of the average
reddening value assigned to each field of our maps is 0.013 mag for both
Magellanic Clouds. Our reddening values are on average higher by 0.061 mag for
the LMC and 0.054 mag for the SMC, compared with the maps of Haschke et al.
(2011). We also compared our values with different types of reddening tracers.
Cepheids, RR Lyrae stars, early-type eclipsing binaries and other reddening
estimations based on the red clump color on average show reddenings consistent
with our map to within a few hundredths of magnitude.

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