First microlensing candidate towards M31 from the Nainital Microlensing Survey

Details First microlensing candidate towards M31 from the Nainital Microlensing Survey First microlensing candidate towards M31 from the Nainital Microlensing Survey

2004-12-21

arxiv.org/abs/astro-ph/0412550v2

Astronomy and Astrophysics

Astrophysics

no changes except typos corrected, to appear in A&A

Scientific paper

10.1051/0004-6361:20042357

We report our first microlensing candidate NMS-E1 towards M31 from the data accumulated during the four years of Nainital Microlensing Survey. Cousin R and I band observations of ~13'x13' field in the direction of M31 have been carried out since 1998 and data is analysed using the pixel technique proposed by the AGAPE collaboration. NMS-E1 lies in the disk of M31 at \alpha = 0:43:33.3 and \delta = +41:06:44, about 15.5 arcmin to the South-East direction of the center of M31. The degenerate Paczy\'{n}ski fit gives a half intensity duration of ~59 days. The photometric analysis of the candidate shows that it reached R~20.1 mag at the time of maximum brightness and the colour of the source star was estimated to be (R-I)_0 ~ 1.1 mag. The microlensing candidate is blended by red variable stars; consequently the light curves do not strictly follow the characteristic Paczy\'{n}ski shape and achromatic nature. However its long period monitoring and similar behaviour in R and I bands supports its microlensing nature.

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