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

• Autorzy: Pietrukowicz P. , Kaluzny J. , Thompson I. B. , Jaroszyński M. , Schwarzenberg-Czerny A. , Krzeminski W. , Pych W.
• Języki publikacji: EN

Abstrakty

EN

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 from the cluster center was detected. It had an amplitude of Δ 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.

Słowa kluczowe

EN

stars: dwarf novae; novae; cataclysmic variables; globular clusters: individual: M22; gravitational lensing

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2005
• Tom: Vol. 55, No. 3
• Strony: 261--274
• Opis fizyczny: Bibliogr. 39 poz., rys., tab., wykr.

Twórcy

autor

Pietrukowicz P.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Kaluzny J.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Thompson I. B.

• arnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

autor

Jaroszyński M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Schwarzenberg-Czerny A.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
• Astronomical Observatory, Adam Mickiewicz University, ul. Słoneczna 36, 61-286 Poznań, Poland

autor

Krzeminski W.

• Las Campanas Observatory, Casilla 601, La Serena, Chile

autor

Pych W.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

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