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. Surez, A. Garca Hernndez Dept.
7 papers on Kepler DSC stars Fruitful discussions Passion for science THANKS
Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain
100 200 300 400 500 600 700 800 900 1000 45 46 47 48 49 50 51 52 53 54 Frequency (µHz) ∆ν (µHz) Frequency versus ∆ν L = 0 L = 1 L = 2 L = 3
HD174966
100 200 300 400 500 600 700 800 900 50 51 52 53 54 55 56 57 58 59 Frequency (µHz) ∆ν (µHz) Frequency versus ∆ν L = 0 L = 1 L = 2 L = 3
HD174936
García Hernández et al. A&A 506, 79(2009) Bounded periodicities in δ Scuti frequency domain
Quasi-Periodic spacing
10 20 30 40 50 60 70 80 10 10
1
10
2
10
3
10
4
Amplitude (µmag) Frequency (d−1) 100 200 300 400 500 600 700 800 900 Frequency (µHz) 1 2 3 4 5 6 7 8 Periodicities in the frequency distribution (d−1) 10 20 30 40 50 60 70 80 90 100 0.05 0.1 0.15 0.2 0.25 Power spectrum normalised to unity Periodicities in the frequency distribution (µHz) 64.04 34.31 22.45 20.70 30 frequencies 60 frequencies 114 frequencies 172 frequencies
García Hernández et al. A&A 506, 79(2009)
Suárez et al. (2014)
∆ν ∆ν = 0.776 ⇣ ρ ρ ⌘0.46
Δν-ρ relation similar to solar-like
García Hernández et al. (2009) Confirmed empirically with eclipsing binaries
Suárez et al. (2014)
2.3µHz in Ω Ωk = [0, 0.4]
5 δ Scuti Gap Filling
Classical PW
Cleaning
A, L, G Gap filling Frequencies Pre whitening number distribution Δν, ε(Δν) ? ρ, ε(ρ) Javier’s talk 2D | NP approach
talk SSA method ApJSS 224, 41 (2016)
poster
HD174966
HD174936 HD50870 HD50844 HD181555
HD174966
Δν = 64 μHz
HD174966
A L HD174966
Δν = 64 μHz
HD174966
30 frequencies
Δν = 64 μHz
HD174936
50 frequencies
Δν/2 = 25.8 μHz
HD181555
30 frequencies
HD50844
50 frequencies Balona et al. (2014)
HD50870
60 frequencies
Δν = 43 μHz
Pre whitening implies confusion in DFT analysis Supports ARMA filling + no-PW as best procedure Proper cleaning seems crucial Complete the analysis (15 stars from CoRoT SF) Comparison with A+Φ cleaning (Garrido & Rodríguez 1996)