J/A+A/510/A39CoRoT light curves of V1127 Aql (Chadid+, 2010)

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. <Astron. Astrophys. 510, A39 (2010)> =2010A&A...510A..39CADC_Keywords: Stars, variable ; SpectroscopyKeywords: stars: atmospheres - stars: variables: RR Lyrae - techniques: photometric - methods: data analysis - hydrodynamics - space vehiclesAbstract: 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: ----------------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------------- 9 24 00.1 +01 41 48 V1127 Aql = V* V1127 Aql -----------------------------------------------------File Summary:

FileName Lrecl Records Explanations

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)

See also: B/corot : CoRoT observation log (CoRoT, 2009)Byte-by-byte Description of file: table1.dat

Bytes Format Units Label Explanations

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

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

Acknowledgements: Merieme Chadid, chadid(at)unice.fr(End)Merieme Chadid [OCA, France], Patricia Vannier [CDS] 27-Nov-2009

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