The first CCD photometric study of the open cluster NGC 2126

Free access article

Issue		A&A Volume 410, Number 3, November II 2003


Page(s)		879 - 885
Section		Stellar clusters and associations
DOI		http://dx.doi.org/10.1051/0004-6361:20031311

A&A 410, 879-885 (2003)
DOI: 10.1051/0004-6361:20031311

The first CCD photometric study of the open cluster NGC 2126

A. Gáspár^{1, 2}, L. L. Kiss^{3, 2}, T. R. Bedding³, A. Derekas^{3, 2}, S. Kaspi⁴, Cs. Kiss⁵, K. Sárneczky^{6, 2}, Gy. M. Szabó¹ and M. Váradi^{1, 2}

¹ Department of Experimental Physics and Astronomical Observatory, University of Szeged, Szeged, Dóm Tér 9, 6720, Hungary
² Guest Observer at Konkoly Observatory
³ School of Physics, University of Sydney 2006, Australia
⁴ School of Physics and Astronomy and the Wise Observatory, Tel-Aviv University, Tel-Aviv 69978, Israel
⁵ Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary
⁶ Astronomical Observatory, Szeged, Hungary

(Received 1 April 2003 / Accepted 18 August 2003 )

Abstract
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~57 hours. Almost 1000 individual V-band frames were examined to find short-period variable stars. We discovered six new variable stars, of which one is a promising candidate for an eclipsing binary with a pulsating component. Two stars were classified as $\delta$ Scuti stars and one as Algol-type eclipsing binary. Two stars are slow variables with ambiguous classification. From absolute $V(RI)_{\rm C}$ photometry we have estimated the main characteristics of the cluster: $m-M=11\fm0\pm0\fm5,\ E(V-I)=0\fm4\pm0\fm1,\ E(V-R)=0\fm08\pm0\fm06\ (E(B-V)=0\fm2\pm0\fm15)$ and $d=1.3\pm0.6$ kpc. Cluster membership is suggested for three variable stars from their positions on the colour-magnitude diagram.

Key words: open cluster and associations: general -- open clusters and associations: individual: NGC 2126 -- stars: variables: general -- $\delta$ Sct

Offprint request: L. L. Kiss, laszlo@physics.usyd.edu.au

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