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Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
| Young stellar objects detected by IRAS
Fluxes of 453 IRAS point sources selected for proximity to dense gashave been accurately determined by co-adding IRAS data. From this set,258 sources are detected in all four bands: 12, 25, 60, and 100 microns.As distance from dense molecular material increases, these sourcesexhibit systematic trends in color and a markedly decreasing luminosity.These trends are broadly consistent with expected evolutionary changesin these stars, with younger objects found closer to dense gas. Thesedata suggest a subtle variation on the criterion for identifying theyoungest objects detectable by IRAS, in addition to that of steeplyrising spectra: a color temperature which is uniform across all fourIRAS bands in the range 40-50 K. These characteristics are used as acriterion to select point sources as candidate very youngpre-main-sequence stars.
| Classification of Composite Spectra.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1961ApJ...134..222S&db_key=AST
| Radial Velocities, Spectral Types, and Luminosity Classes of 820 Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...112...48M&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Freccia |
| Ascensione retta: | 19h17m49.92s |
| Declinazione: | +18°50'55.0" |
| Magnitudine apparente: | 7.69 |
| Distanza: | 1587.302 parsec |
| Moto proprio RA: | 0.6 |
| Moto proprio Dec: | -5 |
| B-T magnitude: | 9.524 |
| V-T magnitude: | 7.842 |
Cataloghi e designazioni:
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