On the detection of the first extragalactic classical chemically peculiar stars

Autor(en)

Hans Michael Maitzen, Ernst Paunzen, Olga Pintado

Abstrakt

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 ?a-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 3s detection limit of 0.015 mag for stars with V = 20 mag. Furthermore we found three objects with significantly negative ?a-values indicating either an Ae/shell or ? 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%).

Organisation(en)

Institut für Astrophysik, Zentraler Informatikdienst

Externe Organisation(en)

Universidad Nacional de Tucumán

Journal

Astronomy & Astrophysics

Band

371

Seiten

L5-L8

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361:20010431

Publikationsdatum

06-2001

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/cba9db94-aa20-45aa-a898-2b5366c5c104