Issue |
A&A
Volume 367, Number 3, March I 2001
|
|
---|---|---|
Page(s) | 910 - 930 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20000549 | |
Published online | 15 March 2001 |
Long-term monitoring of active stars *,**
IX. Photometry collected in 1993
1
Catania Astrophysical Observatory, v. S. Sofia 78, 95125 Catania, Italy e-mail: sme@sunct.ct.astro.it
2
Department of Physics and Astronomy, Catania University, v. S. Sofia 78, 95125 Catania, Italy e-mail: mrodono@alpha4.ct.astro.it
Corresponding author: G. Cutispoto, gcutispoto@alpha4.ct.astro.it
Received:
25
October
2000
Accepted:
15
December
2000
As a part of an extensive program focused on the global properties
and evolution of active stars, high-precision and UBV photometry
of 31 selected stars is presented. The
observations were collected
at the European Southern Observatory over the 31 December 1992-18 January
1993 and the 20 November-3 December 1993 intervals. Additional UBV
photometry obtained by the "Phoenix" and by the Catania Astrophysical
Observatory Automatic Photoelectric Telescopes from 1990 to 1993 is also
presented for some of the program stars. Significant evolution of the light
curves, period
variations and evidence for long-term variability of the global degree of
spottedness are found. Some spectral classifications are revised and the
inferred photometric parallaxes are compared, whenever possible, with the
values measured by the Hipparcos satellite. These observations are finalized
to the construction of an extended photometric database, which can give
important clues on topics such as the stability of spotted areas, differential
rotation, solar-like cycles and the correlation between inhomogeneities at
different atmospheric levels.
Key words: stars: activity / stars: late-type / stars: pre-main sequence / stars: variables / X-ray: stars
© ESO, 2001
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