Issue |
A&A
Volume 389, Number 1, July I 2002
|
|
---|---|---|
Page(s) | 149 - 161 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20020570 | |
Published online | 14 June 2002 |
Observation of periodic variable stars towards the Galactic spiral arms by EROS II *,**,***
1
Laboratoire de l'Accélérateur Linéaire, -Université de Paris-Sud, BP 34, 91898 Orsay Cedex, France
2
, , , Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
3
Institut d'Astrophysique de Paris, , 98bis boulevard Arago, 75014 Paris, France
4
Collège de France, , , 11 place Marcelin Berthelot, 75231 Paris Cedex, France
5
, , 77 avenue de l'Observatoire, 75014 Paris, France
6
Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
7
Universidad de la Serena, Facultad de Ciencias, Departamento de Fisica, Casilla 554, La Serena, Chile
8
Observatoire de Paris, , 92195 Meudon Cedex, France
9
European Southern Observatory (ESO), Casilla 19001, Santiago 19, Chile
10
Ohio State University, Department of Astronomy, Columbus, OH 43210, USA
11
University of Michigan, Department of Astronomy, Ann Arbor, MI48109, USA
12
Laboratoire de l'Accélérateur Linéaire, -Université de Paris-Sud, BP 34, 91898 Orsay Cedex, France , , , Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France Institut d'Astrophysique de Paris, , 98bis boulevard Arago, 75014 Paris, France Collège de France, , , 11 place Marcelin Berthelot, 75231 Paris Cedex, France , , 77 avenue de l'Observatoire, 75014 Paris, France Astronomical Observatory, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen, Denmark Universidad de la Serena, Facultad de Ciencias, Departamento de Fisica, Casilla 554, La Serena, Chile Observatoire de Paris, , 92195 Meudon Cedex, France European Southern Observatory (ESO), Casilla 19001, Santiago 19, Chile Ohio State University, Department of Astronomy, Columbus, OH 43210, USA University of Michigan, Department of Astronomy, Ann Arbor, MI48109, USA Observatoire de Marseille, , 2 place Le Verrier, 13248 Marseille Cedex 04, France
Corresponding author: J.-B. Marquette, marquett@iap.fr
Received:
26
September
2001
Accepted:
11
April
2002
We present the results of a massive variability search
based on a photometric survey of a six square degree region along the Galactic
plane at (,
)
and (
,
).
This survey was performed in the framework of the EROS II
(Expérience de Recherche d'Objets Sombres) microlensing program.
The variable stars were found among 1 913 576 stars
that were monitored between April and June 1998 in two passbands,
with an average of 60 measurements.
A new period-search technique is proposed which makes use of
a statistical variable that characterizes the overall regularity
of the flux versus phase diagram.
This method is well suited when the photometric data are
unevenly distributed in time, as is our case.
1362 objects whose luminosity varies were selected.
Among them we identified 9 Cepheids, 19 RR Lyræ, 34 Miras,
176 eclipsing binaries and 266 Semi-Regular stars.
Most of them are newly identified objects.
The cross-identification with known catalogues
has been performed.
The mean distance of the RR Lyræ is estimated to be
~
kpc undergoing an average absorption
of ~
mag.
This distance is in good agreement with that of disc stars that contribute
to the microlensing source star population.
Our catalogue and light curves are available electronically
from the CDS, Strasbourg and from our Web site.
Key words: techniques: photometry / stars: variables: general / galaxy: stellar content
Full Tables 4 and 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/389/149
© ESO, 2002
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