IC 10: More evidence that it is a blue compact dwarf

Details IC 10: More evidence that it is a blue compact dwarf IC 10: More evidence that it is a blue compact dwarf

2001-03-05

arxiv.org/abs/astro-ph/0103066v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20010206

We present optical spectroscopy of H {\sc ii} regions in the Local Group galaxy IC 10 and $UBVR$ photometry of foreground stars in three fields towards this galaxy. From these data, we find that the foreground reddening due to the Milky Way is $E(B-V)=0.77\pm 0.07 \mathrm{mag}$. We find that IC 10 contains considerable internal dust, which qualitatively explains the variety of reddening values found by studies of its different stellar populations. Based upon our foreground reddening, IC 10 has intrinsic photometric properties like those of a blue compact dwarf galaxy, and not those of a dwarf irregular. This result is consistent with much evidence that IC 10 is in the throes of a starburst that began at least $10 \mathrm{Myr}$ ago. We also report the discovery of a new WR star in the H {\sc ii} region HL111c.

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