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Sottometti un nuovo articolo| Walraven photometry of nearby southern OB associations Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
 
 
 |  | The S201 far-ultraviolet imaging survey. III - A field in Sagittarius Far-ultraviolet imagery of a 20 deg diameter field in Sagittarius,centered near (1950) R.A. 18 h 34 m, decl. -30 deg 25 arcmin, wasobtained by the S201 far-ultraviolet camera during the Apollo 16mission. In a 10-minute exposure covering the 1250-1600 A wavelengthrange, 1034 star images are detectable, with a limiting ultravioletmagnitude of about 10. Most of these objects are identified withearly-type stars listed in the Smithsonian Astrophysical ObservatoryStar Catalog, the Catalog of Stellar Identifications, or both, but 203objects remain unidentified or are identified with late-type stars. Thephotometric measurements appear to be in reasonable agreement with thoseof the International Ultraviolet Explorer for stars in common, and withexpectations for A0 stars. A detailed photometric study was made of theMessier 8 region, and it is concluded that dust-scattered starlightcontributes about half of the total radiation observed from the centralregion of M8.
 
 
 |  | Absolute Emission-Line Intensities in Planetary Nebulae. III. Not Available
 
 
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 Osservazione e dati astrometrici
| Costellazione: | Sagittario |  | Ascensione retta: | 18h06m55.43s |  | Declinazione: | -29°04'29.1" |  | Magnitudine apparente: | 7.791 |  | Distanza: | 298.507 parsec |  | Moto proprio RA: | -0.5 |  | Moto proprio Dec: | -12.1 |  | B-T magnitude: | 7.808 |  | V-T magnitude: | 7.793 |  Cataloghi e designazioni:
 
 
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