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Longterm Photometry of Variables at ESO - Part Two - the Second Data Catalogue 1986-1990
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1993A&AS..102...79S&db_key=AST
| Long-term photometry of variables at ESO. I - The first data catalogue (1982-1986)
This paper presents the catalog of photometric data in the Stromgrensystem obtained during the first four years (October 1982 - September1986) of the Long-Term Photometry of Variables (LTPV) program at ESO.The data are available in computer-readable form.
| Stromgren photometry of the variable Wolf-Rayet star HD 86161 = WR 16
Stromgren uvby photometry of the Wolf-Rayet star WR 16 (HD 86161, WN 8)made in 1985/1986 is presented and discussed. The star appears to changeits brightness with a nonstable periodicity. Light variations arelargely due to continuum variations, while emission line variations playa minor role. Several possible explanations are offered.
| A high precision photometric investigation of the micro-variations of Wolf-Rayet stars
VBLUW photometric observations of seven WR stars, obtained with standarddeviation less than about 0.002 mag using the 90-cm Dutch telescope atESO during March-April 1986, are reported. The observation anddata-reduction techniques are discussed, and the results are presentedin extensive tables and graphs and characterized in detail. Some of thelight and color variations are tentatively attributed totemperature-induced changes in the continuum emission (e.g., nonuniformillumination of the pseudophotosphere due to dynamical inhomogeneitiessuch as temporarily hotter eddies or blobs). Particular attention isgiven to the contrast between the strong W-band (323.6-nm) excesspresently observed in WR 6 (EZ CMa) and the FUV deficiency observed byvan der Hucht et al. in 1974-1976; an explanation based on increasedouter-envelope transparency is proposed.
| Radial velocities in three fields along the southern galactic equator
A list of radial velocities for 764 stars is given for three fields inthe Vela-Carina region of the galaxy. They were obtained from GPO-platestaken at La Silla and reduced following Fehrenbach's method.Slit-spectra were collected with the 152 cm-spectrographic telescope atLa Silla, to derive an accurate radial velocity for a sufficient numberof calibration stars: out of the 29 stars, 26 had no formerly publishedvalue. The global motions of 10 to 14 km/s can be considered as normalon the basis of galactic rotation. Some stars, however, show highvelocities, and are therefore marked with one or two asterisks in thetable.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Yelken |
| Sað Açýklýk: | 09h53m57.87s |
| Yükselim: | -54°50'52.7" |
| Görünürdeki Parlaklýk: | 8.116 |
| Uzaklýk: | 383.142 parsek |
| özdevim Sað Açýklýk: | -16.8 |
| özdevim Yükselim: | 6.3 |
| B-T magnitude: | 8.102 |
| V-T magnitude: | 8.115 |
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