Issue |
A&A
Volume 410, Number 1, October IV 2003
|
|
---|---|---|
Page(s) | 199 - 216 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20030948 | |
Published online | 17 November 2003 |
A quest for PMS candidate stars at low metallicity: Variable HAe/Be and Be stars in the Small Magellanic Cloud
1
Astronomical Institute, University of Utrecht, Princetonplein 5, 3584CC, Utrecht, The Netherlands
2
SRON Laboratory for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands
3
Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
Corresponding author: W. J. de Wit, dewit@arcetri.astro.it
Received:
7
August
2001
Accepted:
13
June
2003
We report the discovery of 5 new Herbig Ae/Be candidate stars in the Small
Magellanic Cloud in addition to the 2 reported in Beaulieu et al. ([CITE]). We discuss these 7 HAeBe candidate stars in terms of (1) their
irregular photometric variability, (2) their near infrared emission, (3) their Hα emission and (4) their spectral type. One star has the typical
photometric behaviour that is observed only among Pre-Main Sequence UX Orionis
type stars. The objects are more luminous than Galactic HAeBe stars and Large
Magellanic Cloud HAeBe candidates of the same spectral type.
The stars were discovered in a systematic search for variable stars in a subset of
the EROS2 database consisting of 115 612 stars in a field of arcmin in
the Small Magellanic Cloud. In total we discovered 504
variable stars. After classifying the different objects according to their type of variability,
we concentrate on 7 blue objects with irregular photometric behaviour.
We cross-identified these objects with emission line catalogues from Simbad and JHK photometry from 2MASS. The analysis is supplemented with obtained narrow and
broad band imaging. We discuss their variability in terms of dust obscuration
and bound-free and free-free emission. We estimate the influence of metallicity
on the circumstellar dust emission from pre-main sequence stars.
Key words: stars: early type / stars: formation / stars: pre-main sequence / Be stars / stars: variables: SMC
© ESO, 2003
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