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
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HIPPARCOS data on Herbig Ae/Be stars: an evolutionary scenario.
Fundamental astrophysical parameters (distance, temperature, luminosity,mass, age) of a sample of 10 Herbig Ae/Be candidates and 3 non-emissionline A and B stars in star forming regions were computed combiningHipparcos parallaxes with data from literature. All genuine Herbig starsin our sample are located between the birthline and the zero-age mainsequence (ZAMS) in the Hertzsprung-Russell diagram (HRD), in accordancewith what is expected for pre-main sequence stars. The region in the HRDclose to the birthline is relatively devoid of stars when compared tothe region closer to the ZAMS, in agreement with the expectedevolutionary time scales. The Herbig Ae/Be stars not associated withstar forming regions were found to be located close to the ZAMS.Additionally we discuss a possible evolutionary scenario for thecircumstellar environment of Herbig stars.
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Study of a complete sample of galaxies. II - Spectroscopy of the nuclei
Spectroscopic observations of a complete sample of 320 galaxies (fromthe Revised Shapley Ames Catalog of Sandage and Tammann, 1981) withdeclination less than or equal to +20 deg, galactocentric velocity lessthan 3000 km/s, and absolute magnitude brighter than M(B) = -21.0 arereported. The 400-700-nm spectra were obtained with resolution about 1nm using the Boller and Chivens spectrograph and image-dissector scannerat the Cassegrain focus of the 1.52-m telescope at ESO on 36 nightsduring 1980-1983. The data are presented in extensive tables and spectraand briefly characterized. The majority of the spectra are classified asH II regions ionized by hot stars or as Seyfert-like nebulosities.
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A catalogue of bright nebulosities in opaque dust clouds
Abstract image available at:http://adsabs.harvard.edu/abs/1977A&AS...29...65B
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CO observations of galactic reflection nebulae
Carbon monoxide emission has been observed toward about 35 galacticreflection nebulae. The peaking of CO temperatures near the hotter starsindicates substantial local heating of the gas and dust by the embeddedstars. Wide low-level emission wings are seen on several of the (C-12)Oline profiles; these are most plausibly interpreted as due to cloudmaterial accelerated by such processes as radiation pressure from thenewborn stars.
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Untersuchungen über Reflexionsnebel am Palomar Sky Survey I. Verzeichnis von Reflexionsnebeln
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Faint Halpha-emission star near rho Ophiuchi and sigma Scorpii.
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A general study of diffuse galactic nebulae.
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On a great nebulous region and the question of absorbing matter in space and the transparency of the nebulae.
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