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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
| UBV beta Database for Case-Hamburg Northern and Southern Luminous Stars
A database of photoelectric UBV beta photometry for stars listed in theCase-Hamburg northern and southern Milky Way luminous stars surveys hasbeen compiled from the original research literature. Consisting of over16,000 observations of some 7300 stars from over 500 sources, thisdatabase constitutes the most complete compilation of such photometryavailable for intrinsically luminous stars around the Galactic plane.Over 5000 stars listed in the Case-Hamburg surveys still lackfundamental photometric data.
| A Near-Infrared Imaging Survey of NGC 2282
We present the first near-infrared (JHK) imaging and photometry of ayoung cluster associated with NGC 2282, a reflection nebula inMonoceros. Our observations reveal that the cluster is centrallyconcentrated with a surface density that falls as r(-1) . The clusterhas a radius of roughly 1.6 pc and contains at least 100 members,approximately 9% of which exhibit infrared excess emissioncharacteristic of young stellar objects. Infrared extinction mapssuggest that the cluster is located at the edge of a molecular cloud andis not heavily reddened. We construct the K-band luminosity function(KLF) of the cluster and find that it increases with magnitude up to thecompleteness limit of our observations (mK = 15.0). The shapeof the KLF is similar to those of other young clusters, such as IC 348and the Trapezium, which suggest that the cluster contains a significantpopulation of pre-main sequence stars. However, at the distance of NGC2282 (1.7 kpc) our observations are not deep enough to sample the lowmass end of the cluster IMF\@. Consequently, our KLF does not providemeaningful constraints on either the age of the cluster or the durationof star formation within it. On the other hand, the low extinctiontoward the cluster, its location at the edge of a molecular cloud, andthe relatively small fraction of infrared excess sources suggest that itis a relatively evolved cluster of pre-main sequence stars with an ageof 5-10 x 10(6) years.
| The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Exciting stars and the distances of the diffuse nebulae
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| Metal abundance and microturbulence in F0-G2 stars and the calibration of the Stromgren m1 index
The strengths of two narrow groups of metal lines are measuredphotoelectrically by means of an echelle spectrometer for 16 F0-G2 giantfield stars and for 12 Hyades main-sequence stars. A model-atmosphereanalysis of these observations and similar observations of main-sequencefield stars observed earlier results in the determination of the metalabundance for 179 stars. In addition, the microturbulence parameter isdetermined for 73 of these stars. The internal accuracy of the resultsis estimated to be plus or minus 0.08 for the logarithmicmetal-to-hydrogen ratio and plus or minus 0.2 km/sec for themicroturbulence parameter. The metal abundances are found to agree verysatisfactorily with values of the logarithmic iron-to-hydrogen ratiodetermined from classical coude spectroscopy regarding both zero pointand scale. It is found that the microturbulence parameter is a functionof the effective temperature and the surface gravity. It increases from1.2 km/sec for solar type stars to approximately 3.0 km/sec for earlyF-type giants.
| Molecular clouds associated with reflection nebulae. I - A survey of carbon monoxide emission
The paper presents 2.6 mm wavelength CO and (C-13)O observations of 130molecular clouds associated with reflection nebulae. Enhanced COemission was found in the vicinity of the illuminating star in abouthalf the objects studied. There is a tendency for the CO peak to beslightly displaced from the star. Many examples of peaks that appear toresult from heating of the cloud by the nearby star are found, whileothers appear to be associated with independent concentrations ofmaterial.
| Stars in reflection nebulae
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1968AJ.....73..233R&db_key=AST
| A study of reflection nebulae.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1966AJ.....71..990V&db_key=AST
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Observation and Astrometry data
| Constellation: | Monoceros |
| Right ascension: | 06h46m51.64s |
| Declination: | +01°18'56.9" |
| Apparent magnitude: | 10.321 |
| Proper motion RA: | -0.1 |
| Proper motion Dec: | -1.6 |
| B-T magnitude: | 10.342 |
| V-T magnitude: | 10.323 |
Catalogs and designations:
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