HI ``Tails'' from Cometary Globules in IC1396

Details HI ``Tails'' from Cometary Globules in IC1396 HI ``Tails'' from Cometary Globules in IC1396

1996-03-21

arxiv.org/abs/astro-ph/9603120v1

Astronomy and Astrophysics

Astrophysics

11 pages, 5 postscript figures, uses aaspp4.sty macros, submitted in uuencoded gzipped tar format, accepted for publication in

Scientific paper

10.1086/310064

IC 1396 is a relatively nearby (750 pc), large (>2 deg), HII region ionized by a single O6.5V star and containing bright-rimmed cometary globules. We have made the first arcmin resolution images of atomic hydrogen toward IC 1396, and have found remarkable ``tail''-like structures associated with some of the globules and extending up to 6.5 pc radially away from the central ionizing star. These HI ``tails'' may be material which has been ablated from the globule through ionization and/or photodissociation and then accelerated away from the globule by the stellar wind, but which has since drifted into the ``shadow'' of the globules. This report presents the first results of the Galactic Plane Survey Project recently begun by the Dominion Radio Astrophysical Observatory.

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