Czasopismo
2007
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Vol. 57, No. 1
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49--60
Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Warianty tytułu
Języki publikacji
Abstrakty
We present results of a search for SX Phe stars in the globular cluster M 92. In photometric reductions, we used the image subtraction method supplemented with a procedure of searching for short-period variables, based on the examination of each pixel in the CCD frame. In addition to two SX Phe stars already known in the cluster, we have found five new variables of this type. One SX Phe variable, v34, shows double-mode pulsation with a period ratio equal to 0.741 or 0.790. The second value would indicate oscillations in radial fundamental and first overtone modes. Combining our ground based data and the WFPC HST observations, we determine the average V magnitudes and (V-IC) colors for three SX Phe stars. Moreover, from an estimate of the scatter in the HST data of all observed blue stragglers we suspect three stars to be variable.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
49--60
Opis fizyczny
Bibliogr. 12 poz., rys., tab., wykr.
Twórcy
autor
- Astronomical Institute, University of Wrocław, Kopernika 11, 51-622 Wrocław, Poland , kopacki@astro.uni.wroc.pl
Bibliografia
- Alard, C., and Lupton, R.H. 1998, Astrophys. J., 503, 325.
- Clement, C.M., et al. 2001, Astron. J., 122, 2587.
- Dolphin, A.E. 2000a, P.A.S.P., 112, 1383.
- Dolphin, A.E. 2000b, P.A.S.P., 112, 1397.
- Jeon, Y-B., et al. 2004, Astron. J., 128, 287.
- Kopacki, G. 2001, Astron. Astrophys., 369, 862.
- Kopacki, G. 2005, Acta Astron., 55, 85.
- Kopacki, G., Kołaczkowski, Z., and Pigulski, A. 2003, Astron. Astrophys., 398, 541.
- Olech, A., et al. 2005, MNRAS, 363, 40.
- Rodríguez, E., and López-González, M.J. 2000, Astron. Astrophys., 359, 597.
- Santolamazza, P., et al. 2001, Astrophys. J., 554, 1124.
- Schwarzenberg-Czerny, A. 1996, Astrophys. J. Letters, 460, L107.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-adea337c-fddd-40cd-b863-6e9a6d4fa461