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J/A+A/506/79    Asteroseismic analysis of HD 174936    (Garcia Hernandez+, 2009)

Asteroseismic analysis of the CoRoT δ-Scuti star HD 174936. Garcia Hernandez A., Moya A., Michel E., Garrido R., Suarez J.C., Rodriguez E., Amado P.J., Martin-Ruiz S., Rolland A., Poretti E., Samadi R., Baglin A., Auvergne M., Catala C., Lefevre L., Baudin F. <Astron. Astrophys. 506, 79 (2009)> =2009A&A...506...79G
ADC_Keywords: Stars, variable ; Spectroscopy Keywords: stars: variables: δ Sct - stars: rotation - stars: oscillations - stars: fundamental parameters - stars: interiors Abstract: We present an analysis of the δ-Scuti star HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies were extracted from the light curve using standard prewhitening techniques. This number of frequencies was obtained by considering a spectral significance limit of sig=10 using the software package SigSpec. Our analysis of the oscillation frequency spectrum reveals a spacing periodicity around 52muHz. Although modes considered here are not in the asymptotic regime, a comparison with stellar models confirms that this signature may stem from a quasi-periodic pattern similar to the so-called large separation in solar-like stars. Description: We have used the program package SigSpec (Reegen 2007A&A...467.1353R). We performed iterations until the limit of sig=10.0 for spectral significance (not sig=5.0 as used as default in SigSpec) because the corresponding S/N values in our data (as determined later using Period04 on the residuals provided by SigSpec) were much lower than expected. Objects: ---------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------- 18 52 58.9 +02 49 51 HD 174936 = TYC 453-219-1 ---------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 82 422 List of peaks detected for HD174936 in the frequency region 0.05-100c/d until sig=10.0
See also: B/corot : CoRoT observation log (CoRoT, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Sequence number of the peak, in the same order that this was detected 5- 15 F11.8 d-1 Freq Frequency 17- 22 F6.4 mmag Amp Amplitude 24- 32 F9.6 rad Phase [-3.14,3.14] Phase 34- 41 F8.3 --- Sig Significance of frequency (1) 43- 50 F8.4 --- S/N Signal to noise ratio (2) 51- 55 F5.3 mmag rms rms for frequency "Seq" (3) 57- 66 F10.8 d-1 e_Freq Formal error on freq (4) 68- 73 F6.4 mmag e_Amp Formal error on Amp (4) 75- 82 F8.6 rad e_Phase Formal error on Phase (4)
Note (1): As defined by Reegen, 2007A&A...467.1353R. Note (2): 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=5c/d centred in the corresponding peak, as usual in a number of papers of Breger et al. Note (3): sigma of the residuals before extracting the peak "Seq" Note (4): Determined using the formulae of Montgomery & O'Donoghue (1999, DSSN 13, 28).
Acknowledgements: Antonio Garcia Hernandez, agh(at)iaa.es
(End) Patricia Vannier [CDS] 24-Jul-2009
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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