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Thread: HII regions in M81

  1. #1
    Member Ivan Maly's Avatar
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    HII regions in M81

    In the spirit of some recent material here, a deeper dive into one of the most observed objects. Last night I was able to hunt down a few of the small HII regions in M81, from the 1983 Hodge-Kennicutt catalog. 20", 250x, SQM 21.6. It's a bit hard to match HK's coordinates to the broadband image. Most identifications are from the Stoyan Atlas of the Messier Objects and two more (305 and 435) are my best attempt using Aladin. Most of these presented a nonstellar or "unstellar" appearance, and the putative foreground star on the N edge of region 746 was also seen, as was the extended object immediately WNW of 652. I'd be interested to hear about other observations of these, and about a method of identification that others use for such objects.

    Last edited by Ivan Maly; January 10th, 2018 at 08:20 PM.

  2. #2
    Member Howard B's Avatar
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    Hi Ivan,

    I used Aladin to identify HII regions in M81, and the regions I've seen are shown here: http://www.skyandtelescope.com/wp-co...82-Details.pdf
    Howard
    28 inch f/4 alt-az Newtonian

  3. #3
    Member Ivan Maly's Avatar
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    Thanks, that's a great approach. I remember your observations now. Incidentally, I saw your region G last night but thought it was a star. Will get back to it.

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