Globulettes in four HII regions

DOI

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 H{alpha} 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.

Cone search capability for table J/AJ/133/1795/table2 (List of globulettes with central positions, dimensions, position angle, mean mass and density)

Identifier
DOI http://doi.org/10.26093/cds/vizier.51331795
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/AJ/133/1795
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/133/1795
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/133/1795
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/133/1795
Provenance
Creator Gahm G.F.; Grenman T.; Fredriksson S.; Kristen H.
Publisher CDS
Publication Year 2009
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interstellar medium; Natural Sciences; Observational Astronomy; Physics