| Issue |
A&A
Volume 412, Number 3, December IV 2003
|
|
|---|---|---|
| Page(s) | 721 - 725 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20031065 | |
| Published online | 08 December 2003 | |
CCD photometric search for peculiar stars in open clusters*,**
V. NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756
1
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
2
Zentraler Informatikdienst der Universität Wien, Universitätsstr. 7, 1010 Wien, Austria
3
Departamento de Física, Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Argentina - Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina
Corresponding author: E. Paunzen, Ernst.Paunzen@univie.ac.at
Received:
7
February
2003
Accepted:
16
June
2003
We have investigated 1008 objects in the area of five
intermediate age
open clusters (NGC 2099, NGC 3114, NGC 6204, NGC 6705 and NGC 6756)
via the narrow band 
-system. The
detection limit for photometric peculiarity is very low (always less than
0.009 mag) due to the high number of individual frames used (193 in total).
We have detected six peculiar objects in NGC 6705 and NGC 6756 from which
one in the latter is almost certainly an unreddened late type foreground star.
The remaining five stars are probably cluster members and
bona fide chemically peculiar objects (two are λ Bootis
type candidates).
Furthermore, we have investigated NGC 3114, a cluster
for which already photoelectric -measurements exist. A comparison
of the CCD and photoelectric values shows very good agreement. Again,
the high capability of our CCD -photometric system to sort out
true peculiar objects together with additional
measurements from broad or intermediate band photometry is demonstrated.
Key words: stars: chemically peculiar / stars: early-type / techniques: photometric / open clusters and associations: general
Based on observations obtained at Complejo Astronómico el Leoncito (CASLEO), operated under the agreement between the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina and the National Universities of La Plata, Córdoba y San Juan; ESO-La Silla, UTSO-Las Campanas and L. Figl Observatory, Mt. Schöpfl (Austria).
© ESO, 2003
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