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On the nature of HD 207331: a new ? Scuti variable
While testing a Strömgren spectrophotometer attached to the 1.5 mtelescope at the San Pedro Mártir observatory, Mexico, a numberof A-type stars were observed, one of which, HD 207331, presented clearindications of photometric variability. CCD photometric data acquiredsoon after, confirmed its variability. In order to determine itspulsation behaviour more accurately, uvby differential photoelectricphotometry was carried out for three nights. As a result of the periodanalysis of the light curves we have found a dominant pulsation mode at21.1 cd^{-1} with an amplitude of 6 mmag. This strongly suggests that HD207331 is a new ? Scuti-type pulsating star.
| Pulkovo compilation of radial velocities for 35495 stars in a common system.
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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.
| The S201 far-ultraviolet imaging survey. II - A field in Cygnus
Far-ultraviolet imagery of a region in Cygnus, a 20 deg diameter fieldcentered near (1950) R. A. 21 h 31.2 m decl. +37 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 (effective wavelength 1400 A), 730 star images can be detected,corresponding to a limiting ultraviolet magnitude of about m (1400) =10. Assuming nominal interstellar extinction values in this region nearthe galactic plane, this result corresponds to the detection of A0 Vstars to a distance of 300 pc and of B0 V stars to 1500 pc.Uncertainties in spectral classification and interstellar extinction forindividual objects are probably more significant than calibration ormeasurement errors. Most of the objects detected are identified withstars in the Smithsonian Astrophysical Observatory Star Catalog (1966),or the Catalog of Stellar Identifications (1979) or both, but 87 objectsremain unidentified (or are identified with late-type stars).
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Cygnus |
| Ascensió Recta: | 21h54m15.39s |
| Declinació: | +45°32'35.2" |
| Magnitud Aparent: | 8.441 |
| Distancia: | 288.184 parsecs |
| Moviment propi RA: | -4.4 |
| Moviment propi Dec: | -10.4 |
| B-T magnitude: | 8.492 |
| V-T magnitude: | 8.446 |
Catàlegs i designacions:
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