Zobrazeno 1 - 10
of 161
pro vyhledávání: '"M. Breger"'
Autor:
J.A. Guzik, M. Breger
Publikováno v:
Communications in Asteroseismology. 162:62-72
Breger et al. (2011) reported on the discovery of 76 frequencies for the star KIC 9700322 from one month (Sept.-Oct. 2009) of short-cadence (1-minute sampling rate) photometric data during Quarter 3 of the NASA Kepler mission. Here we report on a rea
Publikováno v:
Astronomy & Astrophysics. 488:643-651
This study has three principal aims: (i) to increase the number of detected pulsation modes of 44 Tau, especially outside the previously known frequency ranges, (ii) to study the amplitude variability and its systematics, and (iii) to examine the com
Autor:
M. Breger
Publikováno v:
Communications in Asteroseismology. 152:97-105
This paper examines the prospect of observing δ Scuti variables with BRITE. In particular, some of the astrophysical questions, which can be investigated, are discussed together with the methods to be applied. Finally, the seven bright stars suitabl
Publikováno v:
Communications in Asteroseismology. 153:63-66
The star 4 CVn shows strong amplitude variability from year to year with an approximate range of a factor of two for each mode. 32 nights of photometry from 1991 are used to derive the photometric amplitudes of the ten dominant modes. The amplitude v
Autor:
M. Breger
Publikováno v:
Communications in Asteroseismology. 148:52-56
Autor:
M. Breger, Yu. T. Fedotov
Publikováno v:
Communications in Asteroseismology. 148:44-51
Extensive photoelectric measurements of the δ Scuti variable 1 Mon were obtained from 1979 to 1985 at Odessa Astronomical Observatory. These data are presented and analyzed. The star shows an almost equidistant frequency triplet with a number of com
Autor:
M. Breger
Publikováno v:
Communications in Asteroseismology. 150:25-31
The review concentrates on several important aspects of observational studies of δ Scuti stars. After a discussion of promising astrophysical questions we examine • the extreme amplitude variability of the evolved star 4 CVn • the role of rotati
Autor:
M. Breger, M. Chevreton, S. Frandsen, Torben Arentoft, T. H. Dall, Z. Kołaczkowski, Sz. Barcza, C. Barban, Róbert Szabó, C. Sterken, T. Medupe, J. Nuspl, J. A. Belmonte, Mário J. P. F. G. Monteiro, J. M. Benko, G. Kopacki, S. N. Udovichenko, A. Pigulski, F. J. G. Pinheiro, E. Michel, S. K. Gupta
Publikováno v:
Astronomy & Astrophysics. 376:175-187
We present the results of the multisite dierential CCD photometry for the two Scuti stars, BN and BV Cnc, in the open cluster Praesepe. The main objective was to identify the character of the pulsation modes in BN Cnc deriving their accurate periods,
Autor:
M. Breger
Publikováno v:
New Astronomy Reviews. 43:441-447
Reported mode changes in δ Scuti stars can usually be explained by data insufficient to obtain multiperiodic solutions and by the effect of time-variable amplitudes. The extensive data on 4 CVn obtained by the Delta Scuti Network are used to illustr
Autor:
F. Hiesberger, M. Breger
Publikováno v:
Astronomy and Astrophysics Supplement Series. 135:547-553
204 hours of high-quality measurements of 4 CVn during 32 nights were obtained with the 0.75 m Automatic Photolectric Telescope (APT). The two comparison stars measured agreed to ± 2.7 mmag per single measurement in Stromgren y and ± 3.0 mmag in v