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J/A+A/525/A23       Frequency analysis of HD 49434              (Mathias+, 2011)

The gamma Doradus CoRoT target HD 49434. II. Frequency analysis of the CoRoT data. Chapellier E., Rodriguez E., Auvergne M., Uytterhoeven K., Mathias P., Bouabid M.-P., Poretti E., Le Contel D., Martin-Ruiz S., Amado P.J., Garrido R., Hareter M., Rainer M., Eyer L., Paparo M., Diaz-Fraile D., Baglin A., Baudin F., Catala C., Michel E., Samadi R. <Astron. Astrophys. 525, A23 (2011)> =2011A&A...525A..23C
ADC_Keywords: Stars, variable ; Spectroscopy Keywords: stars: variables: general - stars: individual: HD 49434 - stars: oscillations - techniques: photometric Abstract: HD 49434 is a bright (V=5.75mag) and multiperiodic gamma Dor-type pulsator that has been selected for the asteroseismic core programme of the CoRoT satellite. An extensive and detailed study has been carried out to investigate the pulsational content of this object on the basis of the 136.9d (331291 useful datapoints) time series collected by the CoRoT satellite during the long-run LRa01 (October 2007-March 2008). Description: The frequency analysis was carried out using the recently available software package SigSpec and Period04. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 06 48 19.1 -01 19 08 HD 49434 = HR 2514 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 119 1686 List of peaks detected for HD49434 in the frequency region 0.05-30c/d table3.dat 39 481 List of combination frequencies identified in the frequency list of HD49434 in the region 0.05-30c/d and range for validity of 0.005c/d table6.dat 119 978 *List of peaks detected for Subset 1 of HD49434 table7.dat 119 896 *List of peaks detected for Subset 2 of HD49434 table8.dat 82 772 Frequency matching between Subset 1 (i) and the Subset 2 (j) listed within a range of |fre(i)-fre(j)|=0.005c/d table9.dat 82 1468 Frequency matching between Subset 1 (i) and the Subset 2 (j) listed within a range of |fre(i)-fre(j)|=0.010c/d table11.dat 82 1416 Frequency matching between Subset 1 (i) and the Whole dataset (j) listed within a range of |fre(i)-fre(j)|=0.005c/d table12.dat 82 1319 Frequency matching between Subset 2 (i) and the Whole dataset (j) listed within a range of |fre(i)-fre(j)|=0.005c/d table13.dat 82 2701 Frequency matching between Subset 1 (i) and the Whole dataset (j) listed within a range of |fre(i)-fre(j)|=0.010c/d table14.dat 82 2430 Frequency matching between Subset 2 (i) and the Whole dataset (j) listed within a range of |fre(i)-fre(j)|=0.010c/d table16.dat 33 98 Frequencies which are in Subset 1 but not in the Whole dataset (within a range of |fre(i)-fre(j)|=0.005c/d) table17.dat 33 70 Frequencies which are in Subset 2 but not in the Whole dataset (within a range of |fre(i)-fre(j)|=0.005c/d) table18.dat 33 17 Frequencies which are in Subset 1 but not in the Whole dataset (within a range of |fre(i)-fre(j)|=0.010c/d) table19.dat 33 19 Frequencies which are in Subset 2 but not in the Whole dataset (within a range of |fre(i)-fre(j)|=0.010c/d) table21.dat 52 1015 This table is similar to Table 2 (list of 1686 peaks for HD 49434), but the secondary peaks, closer than the frequency resolution 1/DT=0.0073c/d, have been removed from the list table22.dat 30 840 List of peaks retained by phase constancy method table23.dat 84 281 List of peaks retained by matching frequency method
Note on table6.dat: The analysis was performed on Subset1, consisting of a subset of the CoRoT lightcurve of HD49434, between CoRoT days 0.0 to 70.0. Note on table7.dat: The analysis was performed on Subset2, consisting of a subset of the CoRoT lightcurve of HD49434, between CoRoT days 70.0 to 136.9.
See also: B/corot : CoRoT observation log (CoRoT, 2009) J/ApJ/598/597 : Frequency analysis of fundamental-mode RR Lyrae (Alcock+, 2003) J/A+A/506/111 : Frequency analysis of HD 180642 (V1449 Aql) (Degroote+, 2009) J/A+A/506/471 : Frequency analysis of CoRoT B stars (Degroote+, 2009) Byte-by-byte Description of file: table[267].dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak, in the same order as it was detected (G1) 6- 16 F11.8 d-1 Freq Frequency 18- 23 F6.4 mmag Ampl Amplitude 25- 33 F9.6 rad Phase Phase 35- 43 F9.3 --- sig Spectral significance as defined by Reegen (2007A&A...467.1353R) (1) 45- 52 F8.3 --- S/N Signal-to-noise ratio (2) 54- 58 F5.3 mmag rms rms for frequency "i" (sigma of the residuals before extracting the peak "i") 60- 69 F10.8 d-1 e_Freq Formal error bars on frequency (3) 71- 76 F6.4 mmag e_Ampl Formal error bars on Amplitude (3) 78- 85 F8.6 rad e_Phase Formal error bars on Phase (3) 87-119 A33 --- Com Comments (4)
Note (1): We have used the program package SigSpec (Reegen 2007A&A...467.1353R). We performed iterations until the limit of sig=20.0 for spectral significance (not sig=5.0 as used as default in SigSpec) because the corresponding S/N value in our data (as determined later using Period04 on the residuals provided by SigSpec) were much lower than 4.0. After this, we have used Period04 to determine the corresponding noise level and the S/N value. Note (2): Signal-to-noise ratio, calculated using Period04 (Lenz & Breger, 2005, CoAst 146, 5) on the residuals provided by SigSpec. Each S/N value was calculated on a box of width=5 c/d centred on the corresponding peak, as is usual (e.g. Breger, Stich, Garrido, et al., 1993A&A...271..482B). Note (3): Determined using the formulae of Montgomery & O'Donoghue (1999, DSSN 13, 28). Note (4): We list the possible identification of harmonics or combinations between the main peaks within an error bar of "±0.005c/d". For this study only the first twelve main peaks of the list (f1 to f12), the first five harmonics of f1 and f4, and combinations considering the first, second and third orders have been taken into account.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Comb Combination name (1) 17- 18 I2 --- Ncomb Combination number 20- 26 F7.4 d-1 Freqcomb Frequency of the combination (2) 28- 31 I4 --- i Identified peak: number of the peak in the list of detected peaks for this dataset, (this is the order of detection) 33- 39 F7.4 d-1 Freq Identified peak: frequency of the peak
Note (1): For this study only the first twelve main peaks of the list (f1 to f12), the first five harmonics of f1 and f4, and combinations considering the first, second and third orders have been taken into account. Note (2): All frequencies that can be identified with a combination frequency within an errorbar of 0.005c/d have been considered as valid. We only considered frequencies in the range 0.05-30c/d.
Byte-by-byte Description of file: table[89].dat table1[1234].dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak in the first dataset 6- 12 F7.4 d-1 Freqi Frequency in the first dataset 14- 18 F5.3 mmag Ampli Amplitude in the first dataset 20- 27 F8.3 --- sigi Spectral significance as defined by Reegen (2007A&A...467.1353R) in the first dataset 29- 35 F7.3 --- S/Ni Signal-to-noise ratio in the first dataset 38- 41 I4 --- j Number of the peak in the second dataset 43- 49 F7.4 d-1 Freqj Frequency in the second dataset 51- 55 F5.3 mmag Amplj Amplitude in the second dataset 57- 65 F9.3 --- sigj Spectral significance as defined by Reegen (2007A&A...467.1353R) in second dataset 67- 74 F8.3 --- S/Nj Signal-to-noise ratio in the Subset second dataset 76- 82 A7 --- Com Interpretation (1)
Note (1): Our interpretation concerning if two peaks (one from the first list and another from the second list) are the "same" peak or not, based on the following limits: * For table8, table11, table12 a) The two peaks (i and j) are located within a frequency range lower than 0.005c/d, that is, |fre(i)-fre(j)|≤0.005c/d, and b) The difference in order is lower than 50, that is, |i-j|≤50 * For table9, table13, table14 a) The two peaks (i and j) are located within a frequency range lower than 0.01c/d, that is, |fre(i)-fre(j)|≤0.01 c/d, and b) The difference in order is lower than 50, that is, |i-j|≤50 or c) If the difference in order is between 50 to 100, that is, "50≤|i-j|≤100", then: c1) if the difference in amplitude in lower than 20%, then the frequency matching is "real" c2) if the difference in amplitude is between 20% to 50%, then the frequency matching is "casual?" c3) if the difference in amplitude is larger than 50%, then the frequency matching is "casual" or c) If the difference in order is between 50 to 100, that is, "50≤|i-j|≤100", then: c1) if the difference in amplitude in lower than 20%, then the frequency matching is "real" c2) if the difference in amplitude is between 20% to 50%, then the frequency matching is "casual?" c3) if the difference in amplitude is larger than 50%, then the frequency matching is "casual" or d) If the difference in order is larger than 100, that is, |i-j|≥100, then d1) if the difference in amplitude is lower than 50%, then the frequency matching is "casual?" d2) if the difference in amplitude is larger than 50%, then the frequency matching is "casual"-------------------------------------------------------------------------------- Byte-by-byte Description of file: table1[6789].dat
Byte-by-byte Description of file: table1[6789].dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak, in the same order as it was detected 6- 12 F7.4 d-1 Freq Frequency 14- 18 F5.3 mmag Ampl Amplitude 20- 26 F7.3 --- sig Spectral significance as defined by Reegen (2007A&A...467.1353R) 28- 33 F6.3 --- S/N Signal-to-noise ratio
Byte-by-byte Description of file: table21.dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak, in the same order as it was detected (G1) 6- 16 F11.8 d-1 Freq Frequency 18- 23 F6.4 mmag Ampl Amplitude 25- 33 F9.6 rad Phase Phase 35- 43 F9.3 --- sig Spectral significance as defined by Reegen (2007A&A...467.1353R) 45- 52 F8.3 --- S/N Signal-to-noise ratio (2)
Note (2): Signal-to-noise ratio, calculated using Period04 (Lenz & Breger, 2005, CoAst 146, 5) on the residuals provided by SigSpec. Each S/N value was calculated on a box of width=5 c/d centred on the corresponding peak, as is usual (e.g. Breger, Stich, Garrido, et al., 1993A&A...271..482B).
Byte-by-byte Description of file: table22.dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak, in the same order as it was detected 6- 16 F11.8 d-1 Freq Frequency 18- 23 F6.4 mmag Ampl Amplitude 25- 30 F6.4 --- deltaPhi Absolute value of the phase difference between a sine-fit performed on S1 and S2 using the same frequency f in unit 1/f
Byte-by-byte Description of file: table23.dat
Bytes Format Units Label Explanations
1- 4 I4 --- i Number of the peak in the Subset 1 6- 12 F7.4 d-1 Freqi Frequency in the Subset 1 14- 18 F5.3 mmag Ampli Amplitude in the Subset 1 20- 27 F8.3 --- sigi Spectral significance as defined by Reegen (2007A&A...467.1353R) in the Subset 1 29- 35 F7.3 --- S/Ni Signal-to-noise ratio in the Subset 1 38- 41 I4 --- j Number of the peak in the Subset 2 43- 49 F7.4 d-1 Freqj Frequency in the Subset 2 51- 55 F5.3 mmag Amplj Amplitude in the Subset 2 57- 65 F9.3 --- sigj Spectral significance as defined by Reegen (2007A&A...467.1353R) in the Subset 2 67- 74 F8.3 --- S/Nj Signal-to-noise ratio in the Subset 2 76- 82 A7 --- Com Interpretation (1) 84 A1 --- Peak [Y/N] Peak retains (Y) or not (N) using the phase constancy method
Note (1): Our interpretation concerning if two peaks (one from the first list and another from the second list) are the "same" peak or not.
Global notes: Note (G1): Possible interactions with the satellite orbital frequency (assumed as fs=13.972 c/d, fs in the table) has also been studied for the first four main peaks (f1 to fyyyyyy4) and four first harmonics of fs (fs to 4fs). Please note that our range of interest in this table is only from 0 to 30 c/d. We have also studied remaining peaks (residuals) corresponding to the sidelobes of 1 c/d alias frequencies around fs and its harmonics. Moreover, we have also studied the possible interactions between "peaks remaining in the very low frequency domain (lower than 0.05c/d)" with fs (and 1c/d alias and harmonics). The main peak in this region is fl=0.01104c/d with Amplitude=0.257mmag. As shown in this table, some peaks at very low amplitudes seem to originate from these interactions. In summary, 663 possible combinations have been considered. A total of 481 identifications have been detected, but only 312 of them are independent identifications. Moreover, a number of these probably are only "casual coincidences".
Acknowledgements: Philippe Mathias, pmathias(at)ast.obs-mip.fr References: Uytterhoeven et al., Paper I 2008A&A...489.1213U
(End) Patricia Vannier [CDS] 26-Jul-2010
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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