Portal de Periódicos da CAPES

TU Cassiopeiae periods and amplitudes

1979; IOP Publishing; Volume: 229; Linguagem: Inglês

10.1086/156997

1538-4357

S. W. Hodson, A. N. Cox, R. F. Stellingwerf,

History and Developments in Astronomy

view Abstract Citations (19) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS TU Cassiopeiae periods and amplitudes. Hodson, S. W. ; Stellingwerf, R. F. ; Cox, A. N. Abstract Light-curve observations of the double-mode Cepheid TU Cas obtained by 10 different groups of observers on several photometric systems over a time span of 67 years have been carefully studied to determine the fundamental and first-overtone periods and their amplitudes on the V magnitude scale. The presence of a second-overtone radial pulsation is discussed, and it is concluded that a previous detection of this mode was spurious because of the lack of a proper zero-point correction for two groups of observations. It is possible that the amplitude of one of the two modes varies during the entire observing period, with the fundamental-mode amplitude constant at 0.69 plus or minus 0.03 and the overtone amplitude decreasing from 0.4 to 0.25 mag. If this Cepheid displays the two pulsation modes because it is mode switching, this switching time scale may be less than a few hundred years. Publication: The Astrophysical Journal Pub Date: April 1979 DOI: 10.1086/156997 Bibcode: 1979ApJ...229..642H Keywords: Cepheid Variables; Fourier Analysis; Light Curve; Pulsed Radiation; Amplitudes; Fourier Series; Periodic Variations; Stellar Luminosity; Stellar Spectrophotometry; Astronomy; Cepheids:Light Curves; Cepheids:Pulsations full text sources ADS | data products SIMBAD (14)