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Astron. Astrophys. 350, L19-L22 (1999)

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Letter to the Editor

An ongoing parallax microlensing event OGLE-1999-CAR-1 toward Carina

Shude Mao

Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching, Germany

Received 23 August 1999 / Accepted 1 September 1999


We study the first microlensing event toward the Carina spiral arm discovered by the OGLE collaboration. We demonstrate that this long duration event exhibits strong parallax signatures. Additional information from the parallax effect allows us to determine the lens transverse velocity projected onto the Sun-source line to be [FORMULA]. We also estimate the optical depth, event rate and duration distribution for microlensing toward Carina. We show that this event is broadly consistent with these predictions.

Key words: cosmology: dark matter – cosmology: gravitational lensing – stars: variables: general

Send offprint requests to: S. Mao

Correspondence to: smao@mpa-garching.mpg.de

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© European Southern Observatory (ESO) 1999

Online publication: October 4, 1999