The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. IX. RR Lyr Stars in the Small Magellanic Cloud

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

Abstrakty

EN

The ninth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) comprises RR Lyr stars in the Small Magellanic Cloud (SMC). Our sample consists of 2475 variable stars, of which 1933 pulsate in the fundamental mode (RRab), 175 are the first overtone pulsators (RRc), 258 oscillate simultaneously in both modes (RRd) and 109 stars are suspected second-overtone pulsators (RRe). 30 objects are Galactic RR Lyr stars seen in the foreground of the SMC. We discuss some statistical features of the sample. Period distributions show distinct differences between SMC and LMC populations of RR Lyr variable stars, with the SMC stars having on average longer periods. The mean periods for RRab, RRc and RRe stars are 0.596, 0.366 and 0.293 days, respectively. The mean apparent magnitudes of RRab stars are equal to 19.70 mag in the V-band and 19.12 mag in the I-band. Spatial distribution of RRLyr stars shows that the halo of the SMC is roughly round in the sky, however the density map reveals two maxima near the center of the SMC. For each object the multi-epoch V- and I-band photometry collected over 8 or 13 years of observations and finding charts are available to the astronomical community from the OGLE Internet archive.

Słowa kluczowe

EN

stars: variables: RR Lyrae; stars: oscillations; stars: Population II; Magellanic Clouds

• Czasopismo: Acta Astronomica
• Rocznik: 2010
• Tom: Vol. 60, No. 3
• Strony: 165--178
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., 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 Astronomia, Casilla 160-C, Concepción, Chile

autor

Wyrzykowski, Ł.

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

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 team) 1996, AJ, 111, 1146.
• Artyukhina, N.M., et al. 1995, „General Catalogue of Variable Stars”, 4rd ed., vol.V. Extragalactic Variable Stars, „Kosmosinform”, Moscow.
• Baade, W. 1952, Trans. IAU, 8, 397.
• Bono, G., Caputo, F., Cassisi, S., Incerpi, R., and Marconi, M. 1997, ApJ, 483, 811.
• Dartayet, M., and Landi Dessy, J. 1952, ApJ, 115, 279.
• Graham, J.A. 1975, PASP, 87, 641.
• Kaluzny, J., Kubiak, M., Szymański, M., Udalski, A., Krzemiński, W., and Mateo, M. 1995, A&AS, 112, 407.
• Kaluzny, J., Kubiak, M., Szymański, M., Udalski, A., Krzemiński, W., Mateo, M., and Stanek, K.Z. 1998, A&AS, 128, 19.
• Payne-Gaposchkin, C., and Gaposchkin, S. 1966, Smithsonian Contrib. Astrophys., 9, 1.
• Pejcha, O., and Stanek, K.Z. 2009, ApJ, 704, 1730.
• Pojmański, G. 1997, Acta Astron., 47, 467.
• Schwarzenberg-Czerny, A. 1996, ApJ, 460, L107.
• Shapley, H. 1922, Proc. Nat. Acad. Sci., 8, 69.
• Simon, N.R., and Lee, A.S. 1981, ApJ, 248, 291.
• Smith, H.A., Silbermann, N.A., Baird, S.R., and Graham, J.A. 1992, AJ, 104, 1430.
• Soszyński, I., Udalski, A., Szymański, M.K., Kubiak, M., Pietrzyński, G., Woźniak, P.R., Żebruń, K., Szewczyk, O., and Wyrzykowski, Ł. 2002, Acta Astron., 52, 369.
• Soszyński, I., Udalski, A., Szymański, M.K., Kubiak, M., Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., Ulaczyk, K., and Poleski, R. 2009, Acta Astron., 59, 1.
• Soszyński, I., Poleski, R., Udalski, A., Szymański, M.K., Kubiak, M., Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., and Ulaczyk, K. 2010a, Acta Astron., 60, 17.
• Soszyński, I., Udalski, A., Szymański, M.K., Kubiak, M., Pietrzyński, G., Wyrzykowski, Ł., Ulaczyk, K., and Poleski, R., 2010b, Acta Astron., 60, 91.
• Storm, J., Nordstrom, B., Carney, B.W., and Anderson, J. 1994, A&A, 291, 121.
• Suntzeff, N.B., Kinman, T.D., and Kraft, R.P. 1991, ApJ, 367, 528.
• Szymański, M.K. 2005, Acta Astron., 55, 43.
• Thackeray, A.D. 1951, Observatory, 71, 219.
• Udalski, A. 2003, Acta Astron., 53, 291.
• Udalski, A., Szymański, M.K., Soszyński, I., and Poleski, R. 2008a, Acta Astron., 58, 69.
• Udalski, A., Soszyński, I., Szymański, M.K., Kubiak, M., Pietrzyński, G., Wyrzykowski, Ł., Szewczyk, O., Ulaczyk, K., and Poleski, R. 2008b, Acta Astron., 58, 329.
• Weldrake, D.T.F., Sackett, P.D., Bridges, T.J., and Freeman, K.C. 2004, AJ, 128, 736.
• Woźniak, P.R. 2000, Acta Astron., 50, 421.