|New infrared star clusters in the southern Milky Way with 2MASS|
We carried out a 2MASS J, H and Ks survey of infrared starclusters in the Milky Way sector 230deg< l <350deg. This zone was the least studied in the literature,previously including only 12 infrared clusters or stellar groups with|b|< 10deg, according to the recent catalogue by Bica etal. (2003). We concentrated efforts on embedded clusters, which arethose expected in the areas of known radio and optical nebulae. Thepresent study provides 179 new infrared clusters and stellar groups,which are interesting targets for detailed future infrared studies. Thesample of catalogued infrared clusters and stellar groups in the Galaxyis now increased by 63%.
|Merged catalogue of reflection nebulae|
Several catalogues of reflection nebulae are merged to create a uniformcatalogue of 913 objects. It contains revised coordinates,cross-identifications of nebulae and stars, as well as identificationswith IRAS point sources.The catalogue is only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/399/141
|Filamentary Shell Structures from the AAO/UKST Hα Survey|
Here we present the first results of a search for new optical supernovaremnant candidates and other filamentary objects on films produced bythe Anglo-Australian Observatory/UK Schmidt Telescope Hα Survey.Sixty-one fields, or 26% of the Galactic plane survey fields, have beenvisually examined. This has resulted in the detection of four newlargediameter filamentary structures, and the discovery of extensive newoptical emission in two previously known optical supernova remnantcandidates.
|Astrometric positions of stars associated with nebulosities in the southern hemisphere.|
Several stars associated with nebulosities and cited by S. van den Berghand W. Herbst are included in the preliminary programme for theHIPPARCOS mission. When performing preparatory measurements of plates,we encountered difficulties in identifying certain of these objects whenrelying only on coordinates, which led us to take advantage of thiswork, which relates to the southern sky, in order to determine theastrometric position of all the objects in the list, to within 0.35''.This catalogue is available from the Centre for Astronomic Data atStrasbourg.
|The Velocity Field of the Outer Galaxy|
Abstract image available at:http://adsabs.harvard.edu/abs/1993A&A...275...67B
|The velocity field of the outer Galaxy in the Southern Hemisphere. II - CO observations of galactic nebulae|
CO observations of 308 objects (77 percent) from a catalogue (Brand etal., 1985) of galactic emission and reflection nebulae are presented; COwas detected in the direction of 234 nebulae (76 percent). For 194 ofthese objects (63 percent) the emission could actually be associatedwith the nebula. Fifteen objects (5 percent) have associated CO emissionwith velocity in excess of 50 km/s (VLSR). These objects areof crucial importance as they are potentially very distant, and nearlyall of them have been newly identified. In the course of this surveyseveral sources with interesting line profiles were found. Eighteen ofthem exhibit wings and/or plateaus and are potential CO outflow sources.
|The velocity field of the outer Galaxy in the Southern Hemisphere. I - Catalogue of nebulous objects|
A multifrequency program to measure the velocity field of the outerGalaxy in the Southern Hemisphere (l = 230-305 deg) is outlined. Thispaper, the first in a series, presents a catalog of HII regions andreflection nebulae used as a basis for the study. Most of the entriesare previously uncatalogued; the emphasis is on small objects likely tobe very distant from the sun.
|A C-12O (J = 2 - 1) survey of southern hemisphere dark clouds, reflection nebulae and Herbig-Haro type objects|
A search has been conducted for C-120(2 - 1) in 80 southern dark cloudswith and without associated nebulosities. It is noted that, in general,CO could be detected in about half of the clouds surveyed, and thatdetection statistics are dominated by beam dilution. Most of the darkclouds lacking visible nebulosity exhibit no sign of embedded energysources, and about 40 percent of clouds with associated nebulosity showlittle by way of dynamical interaction with a central energy sourcedespite the presence of nebulosities. Significantly enhanced,predominantly red 'wing' emission is seen in about 25 percent of thedetected cases. In the case of GGD 27/28, strong mass outflows from acentral object seem responsible for the observed line profiles.
|On the stellar content and structure of the spiral Galaxy M33|
A blink survey for blue and red stars over the face of M33 has isolatedcandidates for the brightest member stars. Spectroscopy has isolated thebrightest members from the foreground stars. The CM diagrams aredisplayed for stars inside and outside the 143 associations that havebeen identified. The spiral pattern of M33 is outlined using theassociations, H II regions, dust, and the surface brightness of youngunresolved stars. Individual CM diagrams are presented for sixassociations at various distances from the center. The data on thestructure of spiral arms in M33 may provide evidence in support ofdensity-wave arms (the two innermost arms) and material arms in theouter parts.
|A study of stars in southern dust clouds with bright nebulosities|
A study of a total of 24 regions with bright nebulosities in dust cloudssouth of declination -39 deg is presented. Forty-seven stars in theseregions were observed spectroscopically at a dispersion of 58 A/mm, andcoordinates were determined for most of the stars observed. In addition,the stars were classified on the MK system and the distance to eachregion was derived using existing and new photometric data. Attention isgiven to the regions in and around the Southern Coalsack, and eachregion is discussed separately. It is reported that the presentestimates of distances generally agree well with previous estimates.Finally, discrepant values lead to the conclusion that Cen R2 and Cir R2are not well defined groups and that Cen R3 should be removed from thelist of R associations.
|R associations. I - UBV photometry and MK spectroscopy of stars in southern reflection nebulae|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80..212H&db_key=AST
|Catalogue of southern stars embedded in nebulosity.|
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80..208V&db_key=AST
|Studies of bright diffuse galactic nebulae with special regard to their spatial distribution.|