Issue |
A&A
Volume 371, Number 3, June I 2001
|
|
---|---|---|
Page(s) | L5 - L8 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20010431 | |
Published online | 15 June 2001 |
On the detection of the first extragalactic classical chemically peculiar stars *
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:
16
January
2001
Accepted:
22
March
2001
We report on the detection of the first extragalactic,
classical chemically peculiar (CP) stars more
than 100 years after the discovery of this group. Using the
tool of CCD -photometry, eight definite positive
detections in the globular-like stellar cluster NGC 1866
and its surrounding in the
Large Magellanic Cloud were made. More than 1950
objects within a radius of 9.5′ of the cluster center down to
20.5 magnitude were observed in this three filter, narrow
band photometric system. Averaging more than 70
individual frames for all three filters yielded a 3σ detection limit of
0.015 mag for
stars with
mag. Furthermore we found three
objects with significantly negative
-values indicating either
an Ae/shell or λ Bootis nature.
The overall percentage of chemically peculiar stars
for NGC 1866 (1.5% ) seems lower than for the majority
of open clusters in our Milky Way
whereas the incidence within the LMC field is decisively
less (0.3% ).
Key words: galaxies: magellanic clouds / stars: chemically peculiar / stars: early-type
© ESO, 2001
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