Issue |
A&A
Volume 385, Number 3, April III 2002
|
|
---|---|---|
Page(s) | 867 - 873 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20020184 | |
Published online | 15 April 2002 |
CCD photometric search for peculiar stars in open clusters*
III. NGC 2439, NGC 3960, NGC 6134, NGC 6192 and NGC 6451
1
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
2
Zentraler Informatikdienst der Universität Wien, Universitätsstr. 7, 1010 Wien, Austria
Corresponding author: E. Paunzen, Ernst.Paunzen@univie.ac.at
Received:
9
October
2001
Accepted:
17
January
2002
In total, more than 550 objects within the fields of five open clusters
were investigated in order to find classical chemically peculiar stars.
One bona-fide CP candidate was detected in each of the open clusters
NGC 3960, NGC 6192 and NGC 6451. All three objects seem to be members
of the corresponding cluster, taking the results from our photometry as
well as from the literature. For NGC 6192
and NGC 6451 we found widely different interstellar reddening values and therefore
distances and ages in the literature. From an analysis of published
Johnson UBVRI photometry, we were able to rule out a rather old age for
NGC 6451. This is also supported by the finding of one
peculiar object in this cluster with spectral type of about A2.
Five variable objects within the field of NGC 6134 were detected. The variability
exceeds 10 times (or typically 0.03 mag) the standard deviation of the
weighted individual measurements.
But since our observations were obtained mostly within one hour
(typical integration times of five minutes per filter) on several nights within 45 days,
no light curves could be derived. For this cluster,
some Am candidates were reported for which we were not able to detect a significant
positive -value.
Key words: stars: chemically peculiar / stars: early-type / techniques: photometric / open clusters and associations: general
© ESO, 2002
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