The extinction law inside the 30 Doradus nebula
Guido De Marchi, Nino Panagia

TL;DR
This study measures the interstellar extinction law within the 30 Doradus nebula, revealing a higher fraction of large dust grains compared to the Milky Way, likely due to supernova activity.
Contribution
First direct measurement of the extinction law in 30 Doradus using red giant clump stars, showing a larger fraction of large grains than in the Milky Way.
Findings
Extinction law similar to the Milky Way at wavelengths >1 micron.
Higher Rv value indicating more large grains.
Consistent with recent supernova dust production observations.
Abstract
We have studied the interstellar extinction in a field of ~3' x 3' at the core of the 30 Doradus nebula, including the central R136 cluster, in the Large Magellanic Cloud. Observations at optical and near-infrared wavelengths, obtained with the WFC3 camera on board the Hubble Space Telescope, show that the stars belonging to the red giant clump are spread across the colour-magnitude diagrams because of the considerable and uneven levels of extinction in this region. Since these stars share very similar physical properties and are all at the same distance, they allow us to derive the absolute extinction in a straightforward and reliable way. Thus we have measured the extinction towards about 180 objects and the extinction law in the range 0.3 - 1.6 micron. At optical wavelengths, the extinction curve is almost parallel to that of the diffuse Galactic interstellar medium. Taking the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
