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Search for HH Objects and Emission Stars in Star Formation Regions. III. PMS Stars in NGC 7129
Slitless spectroscopy is used to discover 22 emission stars in thecentral and northwest regions of the cluster located in the NGC 7129nebula. 16 of them are found for the first time. This sample isessentially complete up to V 20.0. The emission stars are distributednonuniformly over the field of the cluster and are concentrated towardits center. Photometry in the V, R, and I bands is conducted on morethan a hundred stars in the cluster. This yields an average absorptioncoefficient A V=1.7±0.27 for this region. Based on theirpositions in color diagrams for the optical and near IR ranges, most ofthe emission stars can be regarded as T Tau objects.
| 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 (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/399/141
| Herbig-Haro objects, cometary nebulae, and PMS stars in the star-forming region NGC 7129
Manifestations of pre-main-sequence stellar activity in the star-formingregion NGC 7129 are investigated using new observations and data fromthe literature. The spectrum of HH 105 has been obtained for the firsttime and confirms this to be a Herbig-Haro object with extremely lowexcitation and almost negligible radial velocity. The internal structureof GGD 35 is studied; in particular, emission line splitting has beendetected at the northwest (trailing) edge of the object. The velocityfield in clumps in GGD 34 is analyzed and is confirmed to have asinusoidal character. Other HH objects are briefly discussed. Allreflection and cometary nebulae included in the NGC 7129 group areinvestigated. All T Tauri stars detected in this region to date arelisted, and the Hα emission line profiles of some are described.The complex nature of the interaction of collimated outflows with theinterstellar medium is emphasized.
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