CURiuos Variables Experiment (CURVE): Variable Stars in the Metal-Poor Globular Cluster M56

• Autorzy: Pietrukowicz, P. , Olech, A. , Kędzierski, P. , Złoczewski, K. , Wiśniewski, M. , Mularczyk, K.
• Języki publikacji: EN

Abstrakty

EN

We surveyed a 6.5'×6.5' field centered on the globular cluster M56 (NGC 6779) in a search for variable stars detecting seven variables, among which two objects are new identifications. One of the new variables is an RRLyrae star, the third star of that type in M56. Comparison of the new observations and old photometric data for an RV Tauri variable V6 indicates a likely period change in the star. Its slow and negative rate of -0.005±0.003 d/yr would disagree with post-AGB evolution, however this could be a result of blue-loop evolution and/or random fluctuations of the period.

Słowa kluczowe

EN

Hertzsprung-Russell; HR; C-M diagrams; Stars: individual: BL Her; Stars: individual: RV Tau; Stars: individual: RR Lyr; open clusters: M56 (NGC 6779); associations: individual: M56 (NGC 6779)

• Czasopismo: Acta Astronomica
• Rocznik: 2008
• Tom: Vol. 58, No. 2
• Strony: 121--130
• Opis fizyczny: Bibliogr. 29 poz., rys., tab., wykr.

Twórcy

autor

Pietrukowicz, P.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland ,
• Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña MacKenna 4860, Casilla 306, Santiago 22, Chile

autor

Olech, A.

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

autor

Kędzierski, P.

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

autor

Złoczewski, K.

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

autor

Wiśniewski, M.

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

autor

Mularczyk, K.

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

Bibliografia

• Alard, C., and Lupton, R.H. 1998, ApJ, 503, 325.
• Carretta, E., and Gratton, R.G. 1997, A&AS, 121, 95.
• Carretta, E. 2003, Memorie della Societa Astron. Italiana Sup., 3, 90.
• Clement, C.M., Muzzin, A., Dufton, Q., Ponnampalam, T., Wang, J., Burford, J., Richardson, A., Rosebery, T., Rowe, J., and Sawyer Hogg, H. 2001, AJ, 122, 2587.
• Davis, H. 1917, PASP, 29, 210.
• Gratton, R.G., Bragaglia, A., Carretta, E., Clementini, G., Desidera, S., Grundahl, F., and Lucatello, S. 2003, A&A, 408, 529.
• Harris, H.C., Nemec, J.M., and Hesser, J.E. 1983, PASP, 95, 256.
• Harris, W.E. 1996, AJ, 112, 1487.
• Hatzidimitriou, D., Antoniou, V., Papadakis, I., Kaltsa, M., Papadaki, C., Papamastorakis, I., and Croke, B.F.W. 2004, MNRAS, 348, 1157.
• Kaluzny, J., Thompson, I.B., Krzeminski, W., and Schwarzenberg-Czerny, A. 2006, MNRAS, 365, 548.
• Olech, A., K˛edzierski, P, Złoczewski, K., Mularczyk, K., and Wiśniewski, M. 2003, A&A, 411, 483.
• Olech, A., Rutkowski, A., and Schwarzenberg-Czerny, A. 2007, Acta Astron., 57, 331.
• Percy, J.R., Bezuhly, M., Milanowski, M., and Zsoldos, E. 1997, PASP, 109, 264.
• Percy, J.R., and Coffey, J. 2005, JAAVSO, 33, 193.
• Pietrukowicz, P., and Kaluzny, J. 2004, Acta Astron., 54, 19.
• Pietrukowicz, P., Olech, A., Wiśniewski, M., Kędzierski, P., Mularczyk, K., Złoczewski, K., Starczewski, S., and Szaruga, K. 2006, Acta Astron., 56, 267.
• Rishel, B.E., Sanders, W.L., and Schroder, R. 1981, A&AS, 45, 443.
• Russeva, T. 2000, IBVS, 4846, 1.
• Rutkowski, A., Olech, A.,Mularczyk, K., Boyd, D., Koff, R., and Wiśniewski,M. 2007, Acta Astron., 57, 267.
• Salaris, M., and Weiss, A. 2002, A&A, 388, 492.
• Sawyer, H.B. 1949, Journal of the Royal Astron. Soc. of Canada, 43, 38.
• Schwarzenberg-Czerny, A. 1989, MNRAS, 241, 153.
• Schwarzenberg-Czerny, A. 1996, ApJ, 460, L107.
• Stetson, P.B. 1987, PASP, 99, 191.
• Udalski, A., and Pych, W. 1992, Acta Astron., 42, 285.
• Webbink, R.F. 1981, ApJS, 45, 259.
• Wehlau, A., and Sawyer Hogg, H. 1985, AJ, 90, 12.
• Woźniak, P.R. 2000, Acta Astron., 50, 421.
• Zsoldos, E. 1998, Acta Astron., 48, 775.