SETI bioastro: Microlensing event in M22

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Astrophysics, abstract
astro-ph/0509797

From: Pawel Pietrukowicz [view email]

Date: Tue, 27 Sep 2005 09:12:55 GMT (533kb)

Cluster AgeS Experiment (CASE): Dwarf Novae and a Probable Microlensing
Event in the Globular Cluster M22

Authors: P. Pietrukowicz, J. Kaluzny, I.B. Thompson, M. Jaroszynski, A.
Schwarzenberg-Czerny, W. Krzeminski, W. Pych

Categories: astro-ph

Comments: 12 pages, 8 figures, accepted for publication in Acta Astronomica

We report the identification of a new cataclysmic variable (denoted as CV2)
and a probable microlensing event in the field of the globular cluster M22.
Two outbursts were observed for CV2. During one of them superhumps with
P_sh=0.08875 d were present in the light curve. CV2 has an X-ray counterpart
detected by XMM-Newton. A very likely microlensing event at a radius of 2.3
arcmin from the cluster center was detected. It had an amplitude of
Delta_V=0.75 mag and a characteristic time of 15.9 days. Based on model
considerations we show that the most likely configuration has the source in
the Galactic bulge with the lens in the cluster. Two outbursts were observed
for the already known dwarf nova CV1.

http://arxiv.org/abs/astro-ph/0509797

• Previous message: LARRY KLAES: "SETI bioastro: Are most exoplanets actually brown dwarfs?"

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