Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...373..126d&link_type=abstract
Astronomy and Astrophysics, v.373, p.126-138 (2001)
Astronomy and Astrophysics
Astrophysics
28
Galaxy: Bar, Galaxy: Kinematics And Dynamics, Galaxy: Stellar Content, Galaxy: Structure, Gravitational Lensing
Scientific paper
We present an analysis of the light curves of 9.1 million stars observed during three seasons by EROS (Expérience de Recherche d'Objets Sombres), in the Galactic plane away from the bulge. Seven stars exhibit luminosity variations compatible with gravitational microlensing effects due to unseen objects. The corresponding optical depth, averaged over four directions, is bar tau = 0.43 +/- 0.2\ x\ 10-6. While this value is compatible with expectations from simple Galactic models under reasonable assumptions on the target star distances, we find an excess of events with short timescales toward the direction closest to the Galactic centre. We discuss a possible interpretation involving the contribution of an elongated bar. This work is based on observations made with the MARLY telescope at the European Southern Observatory, La Silla, Chile.
Afonso Carlos
Alard Ch.
Albert J.-N.
Andersen Jeppe J.
Ansari Rafat R.
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