/ftp/cats/aliases/G//GGF2007



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J/AJ/133/1795       Globulettes in four HII regions          (Gahm+, 2007)
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Beginning of ReadMe : J/AJ/133/1795 Globulettes in four HII regions (Gahm+, 2007) ================================================================================ Globulettes as seeds of brown dwarfs and free-floating planetary-mass objects. Gahm G.F., Grenman T., Fredriksson S., Kristen H. <Astron. J., 133, 1795-1809 (2007)> =2007AJ....133.1795G ================================================================================ ADC_Keywords: H II regions ; Globules ; Morphology Keywords: H II regions - ISM: general - ISM: globules - planets and satellites: general - stars: formation Abstract: Some HII regions surrounding young stellar clusters contain tiny dusty clouds, which on photos look like dark spots or teardrops against a background of nebular emission. From our collection of Halpha images of 10 HII regions gathered at the Nordic Optical Telescope, we found 173 such clouds, which we call "globulettes", since they are much smaller than normal globules and form a distinct class of objects. Many globulettes are quite isolated and located far from the molecular shells and elephant trunks associated with the regions. Others are attached to the trunks (or shells), suggesting that globulettes may form as a consequence of erosion of these larger structures. None of our objects appear to contain stellar objects. The globulettes were measured for position, dimension, and orientation, and we find that most objects are smaller than 10kAU. Description: Deep narrowband Halpha images of 50 total fields in 10 HII regions were collected with the 2.6m Nordic Optical Telescope on La Palma, Canary Islands, Spain. Two different filters were used: in 1999 a narrowband filter with 33AA FWHM, covering the nebular emission from only the Halpha line, and in 2000 a filter with 180AA FWHM, also including the strong nebular emission lines of [NII] at 6548.1 and 6583.6AA, flanking the Halpha line, and hence including more nebular emission. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 02 32 42 +61 27 IC 1805 = Cl Melotte 15 19 42 27.9 +23 05 15 NGC 6820 = IRAS 19403+2258 00 03 06 +67 23 NGC 7822 = CTB 2 06 31 40 +04 57 48 Rosette Nebula = CTB 21 ----------------------------------------------------------