The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. II. Type II Cepheids and Anomalous Cepheids in the Large Magellanic Cloud

• Autorzy: Soszyński I. , Udalski A. , Szymański M. K. , Kubiak M. , Pietrzyński G. , Wyrzykowski Ł. , Szewczyk O. , Ulaczyk K. , Poleski R.
• Języki publikacji: EN

Abstrakty

EN

In the second part of the OGLE-III Catalog of Variable Stars (OIII-CVS) we present 197 type II Cepheids and 83 anomalous Cepheids in the Large Magellanic Cloud (LMC). The sample of type II Cepheids consists of 64 BL Her stars, 96 W Vir stars and 37 RV Tau stars. Anomalous Cepheids are divided into 62 fundamental-mode and 21 first-overtone pulsators. These are the largest samples of such types of variable stars detected anywhere outside the Galaxy. We present the period-luminosity and color-magnitude diagrams of stars in the sample. If the boundary period between BL Her and W Vir stars is adopted at 4 days, both groups differ significantly in (V-I) colors. We identify a group of 16 peculiar W Vir stars with different appearance of the light curves, brighter and bluer than ordinary stars of that type. Four of these peculiar W Vir stars show additional eclipsing modulation superimposed on the pulsation light curves. Four other stars of that type show long-period secondary variations which may be ellipsoidal modulations. It suggests that peculiar W Vir subgroup may be related to binarity. In total, we identified seven type II Cepheids simultaneously exhibiting eclipsing variations which is a very large fraction compared to classical Cepheids in the LMC. We discuss diagrams showing Fourier parameters of the light curve decomposition against periods. Three sharp features interpreted as an effect of resonances between radial modes are detectable in these diagrams for type II Cepheids.

Słowa kluczowe

EN

Cepheids; Stars: oscillations; Stars: Population II; Magellanic Clouds

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2008
• Tom: Vol. 58, No. 4
• Strony: 293--312
• Opis fizyczny: Bibliogr. 53 poz., rys., wykr.

Twórcy

autor

Soszyński I.

• 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

autor

Kubiak M.

• 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, Casilla 160-C, Concepción, Chile

autor

Wyrzykowski Ł.

• Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

autor

Szewczyk O.

• Universidad de Concepción, Departamento de Fisica, Casilla 160-C, Concepción, Chile

autor

Ulaczyk K.

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

autor

Poleski R.

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

Bibliografia

• Alard, C., and Lupton, R.H. 1998, ApJ, 503, 325.
• Alard, C. 2000, A&AS, 144, 363.
• Alcock, C., et al. (MACHO) 1998, AJ, 115, 1921.
• Arp, H.C. 1955, AJ, 60, 1.
• Artyukhina, N.M., et al. 1995, “General Catalogue of Variable Stars”, 4rd ed., vol. V. Extragalactic Variable Stars, "Kosmosinform", Moscow.
• Baade, W. 1952, Trans. I.A.U., 8, 397.
• Bono, G., Caputo, F., Santolamazza, P., Cassisi, S., and Piersimoni, A. 1997, AJ, 113, 2209.
• Carson, T.R., Stothers, R., and Vemury, S.K. 1981, ApJ, 244, 230.
• Carson, R., and Stothers, R. 1982, ApJ, 259, 740.
• Clement C.M., Muzzin A., Dufton Q., Ponnampalam T., Wang J., Burford J., Richardson A., Rosebery T., Rowe J., and Hogg, H.S. 2001, AJ, 122, 2587.
• Cutri, R.M., et al. 2003, “2MASS All-Sky Catalog of Point Sources”.
• Demers, S., and Harris, W.E. 1974, AJ, 79, 627.
• Diethelm, R. 1983, A&A, 124, 108.
• Di Fabrizio, L., Clementini, G., Maio, M., Bragaglia, A., Carretta, E., Gratton, R., Montegriffo, P., and Zoccali, M. 2005, A&A, 430, 603.
• Feast, M.W., Laney, C.D., Kinman, T.D., van Leeuwen, F., andWhitelock, P.A. 2008, MNRAS, 386, 2115.
• Fernie, J.D., and Ehlers, P. 1999, AJ, 117, 1563.
• Gautschy, A., and Saio, H. 1996, ARA&A, 34, 551.
• Harris, H.C. 1985, AJ, 90, 756.
• Hodge, P.W., and Wright, F.W. 1963, ApJ, 138, 366.
• Hodge, P.W., and Wright, F.W. 1969, ApJS, 17, 467.
• Hodson, S.W., Cox, A.N., and King, D.S. 1982, ApJ, 253, 260.
• Kaluzny, J., Kubiak, M., Szymański, M., Udalski, A., Krzemiński, W., and Mateo, M. 1997, A&AS, 125, 343.
• King, D.S., Cox, A.N., and Hodson, S.W. 1981, ApJ, 244, 242.
• Kraft, R.P. 1972, in: “The Evolution of Population II Stars”, Ed. A.G.D. Philip, Dudley Obs. Report No. 4, 69.
• Kubiak, M., and Udalski, A. 2003, Acta Astron., 53, 117.
• Kwee, K.K. 1967, Bull. Astron. Inst. Neth., 19, 260.
• Laney, C.D. 1991, in: IAU Symp., 148, “The Magellanic Clouds”, Ed. R. Haynes and D. Milne (Dordrecht: Reidel), 109.
• Moskalik, P., and Buchler, J.R. 1993, ApJ, 406, 190.
• Nemec, J.M., Nemec, A.F.L., and Lutz, T.E. 1994, AJ, 108, 222.
• Payne-Gaposchkin, C. 1956, Vistas Astron., 2, 1142.
• Payne-Gaposchkin, C.H. 1971, Smithsonian Contrib. Astrophys., 13.
• Petersen, J.O., and Diethelm, R. 1986, A&A, 156, 337.
• Pojmański, G. 1997, Acta Astron., 47, 467.
• Schmidt, E.G., Johnston, D., Langan, S., and Lee, K.M. 2004, AJ, 128, 1748.
• Schwarzenberg-Czerny, A. 1996, ApJ, 460, L107.
• Simon, N.R. 1986, ApJ, 311, 305.
• Simon, N.R., and Lee, A.S. 1981, ApJ, 248, 291.
• Soszyński, I., Dziembowski, W.A., Udalski, A., Kubiak, M., Szymański, M.K., Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., and Ulaczyk, K. 2007, Acta Astron., 57, 201.
• Soszyński, I., Poleski, R., Udalski, A., Kubiak, M., Szymański, M.K., Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., and Ulaczyk, K. 2008, Acta Astron., 58, 163 (Paper I).
• Stobie, R.S. 1973, Observatory, 93, 111.
• Strom, S.E., Strom, K.M., Rood, R.T., and Iben, I., Jr. 1970, A&A, 8, 243.
• Szabados, L., Kiss, L.L., and Derekas, A. 2007, A&A, 461, 613.
• Teays, T.J., and Simon, N.R. 1985, ApJ, 290, 683.
• Udalski, A. 2003, Acta Astron., 53, 291.
• Udalski, A., Soszyński, I., Szymański, M., Kubiak, M., Pietrzyński, G., Woźniak, P., and Żebruń, K. 1999, Acta Astron., 49, 223.
• Udalski, A., Szymański, M.K., Soszyński, I., and Poleski. R. 2008, Acta Astron., 58, 69.
• Welch, D.L. 1987, ApJ, 317, 672.
• Welch, D.L. et al. (MACHO) 1999, in: IAU Symp., 190, “New Views of the Magellanic Clouds”, Eds. Y.-H. Chu et al. , (San Francisco: ASP), 513.
• Wallerstein, G., and Cox, A.N. 1984, PASP, 96, 677.
• Woźniak, P.R. 2000, Acta Astron., 50, 421.
• Wright, F.W., and Hodge, P.W. 1971, AJ, 76, 1003.
• Zinn, R., and Dahn, C.C. 1976, AJ, 81, 527.
• Zinn, R., and King, C.R. 1982, ApJ, 262, 700.