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J/MNRAS/415/1577    CoRoT 105288363 Blazhko modulation     (Guggenberger+, 2011)

The CoRoT star 105288363: strong cycle-to-cycle changes of the Blazhko modulation. Guggenberger E., Kolenberg K., Chapellier E., Poretti E., Szabo R., Benko J.M., Paparo M. <Mon. Not. R. Astron. Soc., 415, 1577-1589 (2011)> =2011MNRAS.415.1577G
ADC_Keywords: Stars, variable ; Spectroscopy Keywords: techniques: photometric - stars: individual: CoRoT ID 105288363 - stars: variables: RR Lyrae Abstract: We present an analysis of the COnvection, ROtation and planetary Transits (CoRoT) star 105288363, a new Blazhko RR Lyrae star of type RRab (f0=1.7623d-1), observed with the CoRoT spacecraft during the second long run in the direction of the Galactic Centre (LRc02, time-base 145d). The CoRoT data are characterized by an excellent time-sampling and a low noise amplitude of 0.07mmag in the 2-12d-1 range and allow us to study not only the fine details of the variability of the star, but also long-term changes in the pulsation behaviour and the stability of the Blazhko cycle. We use, among other methods, standard Fourier analysis techniques and O-C diagrams to investigate the pulsational behaviour of the Blazhko star 105288363. In addition to the frequency pattern expected for a Blazhko RR Lyrae star, we find an independent mode (f1=2.984d-1) showing a f0/f1 ratio of 0.59 which is similar to that observed in other Blazhko RR Lyrae stars. The bump and hump phenomena are also analysed, with their variations over the Blazhko cycle. We carefully investigated the strong cycle-to-cycle changes in the Blazhko modulation (PB=35.6d), which seem to happen independently and partly diametrically in the amplitude and phase modulations. Furthermore, the phasing between the two types of modulations is found to change during the course of the observations. Description: The data used in this study were obtained in the framework of the Additional Programmes of the exoplanetary field during the second long run in the direction of the Galactic Centre (LRc02). Observations were carried out during a time-span of 145 d from 2008 April 15 to 2008 September 7, or CoRoT JD 3027.47 to 3172.46. Objects: -------------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------------- 18 39 30.87 +07 26 55.3 CoRoT 105288363 = CoRoT 105288363 -------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 43 79 *List of frequencies, amplitudes and phases obtained from the analysis of the full data set (all cycles combined), assuming equidistant multiplets table3.dat 54 256 Observed maxima and minima of the pulsation of CoRoT ID 105288363
Note on table1.dat: The values should be understood as mean values, as the properties of the pulsation change from cycle to cycle.
See also: B/corot : CoRoT observation log Release 7 (CoRoT, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Type [FBTQI] Type of frequency (1) 3- 10 A8 --- Name Name of the frequency 12- 19 F8.5 d-1 Freq Frequency (2) 22- 28 F7.5 mag Amp Amplitude (Errors are 0.00028mag) 30- 35 F6.4 --- phi [0/1] Phase 38- 43 F6.4 --- e_phi [0/1] rms uncertainty on phi obtained from a Monte Carlo (MC) simulation with Period04
Note (1): Type of frequency as follows: F = main frequency B = Blazhko frequency T = Significant triplet components Q = Significant quintuplet components I = Independent mode Note (2): Errors are 0.00004, 0.0002 and 0.0014d-1 for the three independent frequencies, that is, for the main frequency f0, for its highest side peak (f0-fB), which was used for fixing the spacings, and for f1, respectively.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- E Epoch (cycle) 5- 13 F9.4 d Tmax ?=- Times of maximum (HJD-2450000) 15- 21 F7.4 mag magM ?=- Relative magnitude at Tmax 23- 29 F7.4 d O-CM ?=- O-C at Tmax 31- 39 F9.4 d Tmin ?=- Times of minimum (HJD-2450000) 41- 46 F6.4 mag magm ?=- Relative magnitude at Tmin 48- 54 F7.4 d O-Cm ?=- O-C at Tmin
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Mar-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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