7 papers on Kepler DSC stars Fruitful discussions Passion for - PowerPoint PPT Presentation

7 papers on Kepler DSC stars Fruitful discussions Passion for science THANKS

THE IMPACT OF GAP-FILLING METHODS ON THE DETERMINATION OF PERIODICITIES FOR A-F STARS STARS 2016 | Windermere UK J.C. Suárez, A. García Hernández Dept. Física Teórica y del Cosmos. Univ. Granada, Spain J.Pascual-Granado, R. Garrido Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain

IN PROGRESS…

SEARCHING FOR PATTERNS Frequency versus ∆ν Frequency versus ∆ν 59 54 58 53 HD174966 HD174936 57 52 56 51 55 50 ∆ν ( µ Hz) ∆ν ( µ Hz) 54 49 53 48 52 47 L = 0 L = 0 51 46 L = 1 L = 1 L = 2 L = 2 L = 3 L = 3 50 45 100 200 300 400 500 600 700 800 900 100 200 300 400 500 600 700 800 900 1000 Frequency ( µ Hz) Frequency ( µ Hz) García Hernández et al. A&A 506, 79(2009) 5 μ Hz Bounded periodicities in δ Scuti frequency domain

SEARCHING FOR PATTERNS Frequency ( µ Hz) Periodicities in the frequency distribution (d − 1 ) 100 200 300 400 500 600 700 800 900 4 10 1 2 3 4 5 6 7 8 � 64.04 30 frequencies 60 frequencies 0.25 114 frequencies Power spectrum normalised to unity 172 frequencies 3 10 � 20.70 � 22.45 0.2 Amplitude ( µ mag) � 34.31 2 0.15 10 0.1 1 10 0.05 0 10 0 10 20 30 40 50 60 70 80 10 20 30 40 50 60 70 80 90 100 Frequency (d − 1 ) Periodicities in the frequency distribution ( µ Hz) García Hernández et al. A&A 506, 79(2009) Δν Quasi-Periodic spacing

Δν - ρ relation similar to solar-like ⇣ ρ ∆ ν ⌘ 0 . 46 = 0 . 776 ∆ ν � ρ � Suárez et al. (2014)

Confirmed empirically with eclipsing binaries García Hernández et al. (2009)

Ω 2 . 3 µ Hz in = [0 , 0 . 4] Ω k ✏ (¯ ⇢ ) . 10% Suárez et al. (2014)

INGREDIENTS Classical PW 5 δ Scuti Cleaning Gap Filling

Javier’s talk Δν , ε ( Δν ) Gap filling Pre whitening A, L, G Frequencies ? number ρ , ε ( ρ ) distribution M. Paparò’s poster R. Ouazzani’s SSA method talk 2D | NP approach ApJSS 224, 41 (2016)

THE SAMPLE HD174966 HD174936 HD50870 HD50844 HD181555

G HD174966 Δν = 64 μ Hz

G HD174966 A Δν = 64 μ Hz L HD174966

HD174966 Δν = 64 μ Hz 30 frequencies

Δν /2 = 25.8 μ Hz HD174936 50 frequencies

HD181555 30 frequencies

HD50844 50 frequencies Balona et al. (2014)

HD50870 60 frequencies Δν = 43 μ Hz

PRELIMINARY CONCLUSIONS Pre whitening implies confusion in DFT analysis Proper cleaning seems crucial Supports ARMA filling + no-PW as best procedure CONTINUATION Complete the analysis (15 stars from CoRoT SF) Comparison with A+ Φ cleaning (Garrido & Rodríguez 1996)

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