scholarly journals New WET Observations of the δ Scuti Star CD-24 7599: amplitude variability and discovery of 13 pulsation modes

1995 ◽  
Vol 155 ◽  
pp. 331-332
Author(s):  
G. Handler ◽  
D. O’Donoghue ◽  
D. A. H. Buckley ◽  
O. Giovannini ◽  
S. O. Kepler ◽  
...  
Keyword(s):  
Linear Combination ◽  
Mode Coupling ◽  
Power Spectra ◽  
Resonant Mode ◽  
High Quality ◽  
Amplitude Variability ◽  
Spectroscopic Observations ◽  
Scuti Star ◽  
Combination Frequencies ◽  
Whole Earth

The variability of CD-24 7599 (V=11.48 mag) was discovered by JCC during observing run XCOV7 of the Whole Earth Telescope (WET, Nather et al. 1990) network in February, 1992. The star was observed as an additional target and 117 hours of high-quality temporal spectroscopic observations were obtained.Our analysis of these data revealed the presence of 7 independent pulsation modes between 27.0 and 38.1 cycles per day (313 – 441 μHz) with semiamplitudes of 2.1 – 10.2 milli-modulation amplitudes (mma). We showed that peaks at linear combination frequencies detected in the power spectra were not due to eigenmodes excited to visible amplitude by resonant mode coupling.

Resonant mode coupling for deriving optical resonances in stacked grating structures

2010 ◽  
Author(s):  
Thomas Weiss ◽  
Nikolay A. Gippius ◽  
Richard Taubert ◽  
Gérard Granet ◽  
Sergei G. Tikhodeev ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Resonant Mode ◽  
Optical Resonances

Non-resonant mode-coupling model of ICRF heating

1987 ◽  
Author(s):  
G. Francis ◽  
A. Bers ◽  
A. K. Ram
Keyword(s):  
Mode Coupling ◽  
Coupling Model ◽  
Resonant Mode ◽  
Icrf Heating

scholarly journals Close Frequency Pairs in Delta Scuti Stars

2002 ◽  
Vol 185 ◽  
pp. 326-327
Author(s):  
K.M. Bischof ◽  
M. Breger
Keyword(s):  
Phase Shift ◽  
Power Spectra ◽  
Phase Changes ◽  
Single Frequency ◽  
Sufficient Data ◽  
Amplitude Variability ◽  
Pulsation Mode ◽  
Delta Scuti ◽  
Close Frequency ◽  
Scuti Stars

AbstractThe power spectra of several δ Scuti stars show close peaks with similar frequencies and amplitudes. Apart from possible observational problems, this can be interpreted in terms of two separate pulsation modes with similar, close frequencies or an artifact of amplitude variability of a single pulsation mode. If sufficient data are available, it is possible to distinguish between the two hypotheses on the basis of expected systematic phase changes associated with the amplitude variations of an assumed single frequency. This phase-shift test has been applied to modes found for BI CMi. In this paper we present the evidence for one of the close frequency pairs found in this star.

scholarly journals COROT – A Unique Database for Low Amplitude Variability Between 1 Minute and 150 Days

2000 ◽  
Vol 176 ◽  
pp. 69-70
Author(s):  
E. Michel ◽  
A. Baglin ◽  
P. Barge ◽  
C. Catala ◽  
M. Auvergne ◽  
...  
Keyword(s):  
Quality Data ◽  
Wide Field ◽  
High Quality ◽  
High Quality Data ◽  
Amplitude Variability ◽  
The Core ◽  
Core Program ◽  
Rich Material ◽  
Stellar Seismology ◽  
Low Amplitude

AbstractCOROT is a high precision wide field photometry experiment from space, funded in the framework of the CNES “Petites Missions” program (the PI is A. Baglin). It will observe approximately 30000 objects with mV between 4.5 and 15.5 over long observational periods (up to 150 d), with a time sampling between 1 s and 16 min, a precision of the order of 10−4 per measurement. The scientific objectives are stellar seismology and the search for telluric planets. The instrument and the core program have already been presented in several places. We here focus on a description of the characteristics of the data to be obtained with COROT. The large amount of high quality data collected by COROT will constitute rich material for several research programs beyond the core program as already defined (http://www.astrsp-mrs.fr/www/corot.html). A call for proposal of additional programs will be made during Northern Spring 2000.

scholarly journals Evidence of amplitude modulation due to resonant mode coupling in theδScuti star KIC 5892969

2015 ◽  
Vol 579 ◽  
pp. A133 ◽  
Author(s):  
S. Barceló Forteza ◽  
E. Michel ◽  
T. Roca Cortés ◽  
R. A. García
Keyword(s):  
Amplitude Modulation ◽  
Mode Coupling ◽  
Resonant Mode

Non-linear resonant mode coupling in a three-dimensional guiding centre water bag plasma

1977 ◽  
Vol 19 (9) ◽  
pp. 811-816 ◽  
Author(s):  
M Gros ◽  
P Bertrand ◽  
G Baumann
Keyword(s):  
Mode Coupling ◽  
Three Dimensional ◽  
Resonant Mode ◽  
Non Linear

Strong resonant mode coupling of Fabry–Perot and grating resonances in stacked two-layer systems

2011 ◽  
Vol 9 (4) ◽  
pp. 390-397 ◽  
Author(s):  
Thomas Weiss ◽  
Nikolay A. Gippius ◽  
Gérard Granet ◽  
Sergei G. Tikhodeev ◽  
Richard Taubert ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Resonant Mode ◽  
Fabry Perot

Vibrational Instabilities and Pulsational Properties of Cool White Dwarfs

1979 ◽  
Vol 53 ◽  
pp. 359-373 ◽  
Author(s):  
W. Dziembowski
Keyword(s):  
Mode Coupling ◽  
White Dwarfs ◽  
Dominant Role ◽  
Nonlinear Effects ◽  
Resonant Mode ◽  
Finite Amplitude ◽  
Oscillation Modes ◽  
Type Variable ◽  
Ceti Type ◽  
Cool White Dwarfs

AbstractAttention is focused on those aspects of the theory that may be relevant in understanding the nature of ZZ Ceti-type variable white dwarfs. Recent calculations show that the opacity mechanism can drive a large variety of oscillation modes, including the ones that fit observed periods. An estimate of nonlinear effects shows that resonant mode coupling plays a dominant role in determining the finite amplitude behaviour of oscillations and is also probably responsible for rapid amplitude changes observed in these variables.

Sign in / Sign up

Export Citation Format

Share Document