The Optical Gravitational Lensing Experiment. Variable Stars in the Field of Open Cluster NGC 6755

• Autorzy: Ciechanowska A. , Pietrzyński G. , Kołaczkowski Z. , Wyrzykowski Ł. , Szewczyk O. , Kubiak M. , Udalski A. , Szymański M. K.
• Języki publikacji: EN

Abstrakty

EN

We present the results from a search for variable stars in the field of a young open cluster NGC 6755. Altogether seventy one variable stars have been discovered. Thirty one of them are eclipsing systems. This group contains ten EA, four EB and seventeen EW-type systems. Photometric variability of four late type stars is most probably caused by their chromospherical activity. Another seven detected variable stars have light curves typical for pulsating stars from the main instability strip. Four of them we tentatively classified as γ Dor, one as δ Sct and two as Population II Cepheid variable stars, respectively. Star designated as V40 can be either another population II Cepheid or an ellipsoidal binary system. The remaining twenty eight variable stars found in the field of this open cluster are most probably highly obscured background red giants (OSARG, irregular). For all detected variable stars we provide their light curves, preliminary classification, discussion on the possible cluster membership, equatorial coordinates, finding charts and periods when possible.

Słowa kluczowe

EN

binaries: eclipsing; Stars: oscillations; open clusters and associations: individual: NGC 6755

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2007
• Tom: Vol. 57, No. 3
• Strony: 249--266
• Opis fizyczny: Bibliogr. 20 poz., rys., tab., wykr.

Twórcy

autor

Ciechanowska A.

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

autor

Pietrzyński G.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Universidad de Concepción, Departamento de Fisica, Astronomy Group, Casilla160-C, Concepción, Chile

autor

Kołaczkowski Z.

• Universidad de Concepción, Departamento de Fisica, Astronomy Group, Casilla160-C, Concepción, Chile
• Astronomical Institute, University of Wrocław ul. Kopernika 11, 51-622 Wrocław, Poland

autor

Wyrzykowski Ł.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom

autor

Szewczyk O.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Universidad de Concepción, Departamento de Fisica, Astronomy Group, Casilla160-C, Concepción, Chile

autor

Kubiak M.

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

autor

Udalski A.

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

autor

Szymański M. K.

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

Bibliografia

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• Hoag, A., Johnson, H., Iriarte, B., Mitchell, R., Hallam, K., and Sharpless, S. 1961, PUSNO, 17, 347.
• Kubiak, M., and Udalski, A. 2003, Acta Astron., 53, 117.
• Kjeldsen, H., and Frandsen, S. 1991, Astron. Astrophys. Suppl. Ser., 87, 119.
• Pietrzyński, G. 1996a, Acta Astron., 46, 287.
• Pietrzyński, G. 1996b, Acta Astron., 46, 349.
• Pietrzyński, G. 1997, Acta Astron., 47, 211.
• Pietrzyński, G., Kubiak, M., Udalski, A., and Szymański, M. 1997, Acta Astron., 47, 437.
• Pietrzyński, G., Kubiak, M., Udalski, A., and Szymański, M. 1998, Acta Astron., 48, 489.
• Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., and Bielewicz, M. 2001, Acta Astron., 51, 65.
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• Soszyński, I., et al. 2004, Acta Astron., 54, 347.
• Udalski, A., Kubiak, M., and Szymański, M. 1997, Acta Astron., 47, 319.
• Udalski, A., Szymański, M., Kubiak, M., Pietrzyński, G., Woźniak, P., and Żebruń, K. 1998, Acta Astron., 48, 147.
• Udalski, A., Szymański, M., Kubiak, M., Pietrzyński, G., Soszyński, I., Woźniak, P., and Żebruń, K. 1999a, Acta Astron., 49, 201.
• Udalski, A., Soszyński, I., Szymański, M., Kubiak, M., Pietrzyński, G., Woźniak, P., and Żebruń, K. 1999b, Acta Astron., 49, 223.
• Wallerstein, G. 2002, P.A.S.P., 114, 689.
• Wyrzykowski, Ł., Pietrzyński, G., and Szewczyk,O. 2002, Acta Astron., 52, 105.