J/A+A/510/A39 CoRoT light curves of V1127 Aql (Chadid+, 2010)
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First CoRoT light curves of RR Lyrae stars:
Complex multiplet structure and non-radial pulsation detections in V1127 Aql.
Chadid M., Benko J.M., Szabo R., Paparo M., Chapellier E., Kolenberg K.,
Poretti E., Bono G., Le Borgne J.-F., Trinquet H., Artemenko S.,
Auvergne M., Baglin A., Debosscher J., Grankin K.N., Guggenberger E.,
Weiss W.W.
=2010A&A...510A..39C
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ADC_Keywords: Stars, variable ; Spectroscopy
Keywords: stars: atmospheres - stars: variables: RR Lyrae -
techniques: photometric - methods: data analysis - hydrodynamics -
space vehicles
Abstract:
The CoRoT space mission - Convection Rotation and Planetary Transits -
is a great opportunity for monitoring stars with excellent
time-sampling and unprecedented photometric precision for up to
150days. As an important benefit, high-quality RR Lyrae light curves
are obtained with a quasi-uninterrupted coverage over several
pulsation and Blazhko cycles. The Blazhko effect in RR Lyrae stars is
an unsolved problem of astrophysics. We used the high-precision space
data to contribute with more precise knowledge to clear up the
possible physical processes behind the phenomenon. We applied
different period finding techniques including Period04, MuFrAn, PDM
and SigSpec. Amplitude and phase modulation were investigated by an
analytical function method as well as with the traditional O-C
diagrams. The Blazhko modulation frequency is directly detected in the
spectrum, as well as its first and second harmonics. It shows the
non-linear nature of the Blazhko modulation. Besides the triplets,
further higher-order modulation side peaks appear around the pulsation
frequency as quintuplet, septuplet, nonuplet, undecaplet, tredecaplet,
quindecaplet and septdecaplet structures. Additional frequencies, not
belonging to the classical multiplet structures, are detected, and
their linear combinations with the fundamental radial mode. We
interpret these additional terms as non-radial modes. During the five
consecutive Blazhko cycles, there is a shift of the maximum phase
around 0.011 pulsation phase which is likely the consequence of a long
term modulation.
Description:
Frequencies, Fourier amplitudes, phases, spectral significances and
identification of the frequencies of the CoRoT light curve of the RR
Lyrae star V1127 Aql - CoRoT ID:0100689962 - during 143 days in the
First Long Run Center of Milky Way. The CoRoT data used in this study
are the calibrated light curves, N2-level, that have been measured by
the CoRoT Exoplanet CCDs during the first long run in the centre
direction of Galaxy. The total time span is 143days. The time
sampling of the light curves is 32s, an average is taken on board
over 16 such measurements and resulting in a nominal sampling time of
512s. We used here the resulting "white" flux.
Objects:
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RA (2000) DE Designation(s)
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9 24 00.1 +01 41 48 V1127 Aql = V* V1127 Aql
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 468 Frequencies, Fourier amplitudes, phases, spectral
significances and identification of the
frequencies of the CoRoT light curve of the
RR Lyrae star V1127 Aql (CoRoT 0100689962)
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See also:
B/corot : CoRoT observation log (CoRoT, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Type Type of frequency (1)
5- 13 F9.6 d-1 Freq Fourier frequency
15- 21 F7.5 mag Amp Fourier Amplitude
24- 29 F6.2 deg Phi Phase
31 A1 --- l_Signi Limit flag on Signi
32- 38 F7.2 --- Signi Spectral significance
41- 61 A21 --- ID Identification of the frequency
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Note (1): Type of frequency as follows:
A1 = Main frequency and harmonics
A2 = Blazhko modulation frequency and its harmonics
A3 = Modulation triplet frequencies
A4 = Modulation quintuplet frequencies
A5 = Modulation septuplet frequencies
A6 = Modulation nonuplet frequencies
A7 = Modulation undecaplet frequencies
A8 = Modulation tredecaplet frequencies
A9 = Modulation quindecaplet frequencies
A10 = Modulation septdecaplet frequency
B1 = Additional terms in the second modulation hypothesis
B2 = Additional terms, linear combinations and second modulation
B3 = Additional terms in the second modulation hypothesis,
linear combinations
B4 = Additional terms in the second modulation hypothesis,
linear combinations, Blazhko modulation
B5 = Additional terms, linear combinations, Blazhko modulation and
second modulation
C1 = Additional terms identified as independent modes
C2 = Linear combinations between additional terms and f_0_, with
or without f_m_
C3 = Linear combinations between additional terms and
the Blazhko modulation
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Acknowledgements:
Merieme Chadid, chadid(at)unice.fr
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(End) Merieme Chadid [OCA, France], Patricia Vannier [CDS] 27-Nov-2009