2014A&A...568A..34B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.15CEST19:51:44

2014A&A...568A..34B - Astronomy and Astrophysics, volume 568A, 34-34 (2014/8-1)

Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves.

BRAVO J.P., ROQUE S., ESTRELA R., LEAO I.C. and DE MEDEIROS J.R.

Abstract (from CDS):

The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time-frequency analysis of stellar light curves using the wavelet transform is a practical tool for identifying rotation, magnetic activity, and pulsation signatures. We present the wavelet spectral composition and multiscale variations of the time series for four classes of stars: targets dominated by magnetic activity, stars with transiting planets, those with binary transits, and pulsating stars. We applied the Morlet wavelet (6th order), which offers high time and frequency resolution. By applying the wavelet transform to the signal, we obtain the wavelet local and global power spectra. The first is interpreted as energy distribution of the signal in time-frequency space, and the second is obtained by time integration of the local map. Since the wavelet transform is a useful mathematical tool for nonstationary signals, this technique applied to Kepler and CoRoT light curves allows us to clearly identify particular signatures for different phenomena. In particular, patterns were identified for the temporal evolution of the rotation period and other periodicity due to active regions affecting these light curves. In addition, a beat-pattern signature in the local wavelet map of pulsating stars over the entire time span was also detected.

Abstract Copyright:

Journal keyword(s): methods: data analysis - techniques: photometric - stars: rotation - stars: activity - stars: oscillations - binaries: eclipsing

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 CoRoT 102918586 EB* 06 48 54.3084 -00 52 22.875   12.74 12.32 12.34   A5IV 20 0
2 CoRoT 105288363 RR* 18 39 30.8644913900 +07 26 53.519296762   16.198 15.323 15.082   ~ 16 0
3 KIC 7257008 Er* 18 47 27.3961416156 +42 49 52.806115881           ~ 10 0
4 V* V360 Lyr RR* 19 01 58.6391092562 +46 26 45.637924847       16.71   ~ 22 0
5 KOI-7.01 Pl 19 02 27.6981397378 +50 08 08.703759444           ~ 81 1
6 KOI-7 * 19 02 27.6981397378 +50 08 08.703759444           G0 79 3
7 KOI-3781 cC* 19 03 33.2707329667 +38 29 12.670420256     13.359   11.990 ~ 14 0
8 KIC 1995351 Ro* 19 04 23.2647061647 +37 27 18.036455820           ~ 7 0
9 ASAS J190751+4629.2 dS* 19 07 50.7098534784 +46 29 11.907578082     12.610 12.74 12.165 F1V 28 0
10 TYC 3124-1108-1 gD* 19 08 18.8924730976 +39 41 36.521657056   12.38 11.43     ~ 9 0
11 KOI-3452 EB* 19 10 32.8952803352 +42 31 50.895836700           ~ 10 0
12 KIC 3744571 gD* 19 23 05.5991703390 +38 48 51.894500642           ~ 6 0
13 KIC 2710594 gD* 19 23 33.3144 +37 59 00.555   11.91 11.74     ~ 11 0
14 CoRoT-2 * 19 27 06.4944821296 +01 23 01.357597206   13.422 12.568 12.204 11.49 G7V+K9V 201 2
15 CoRoT-2b Pl 19 27 06.4944821296 +01 23 01.357597206     12.57     ~ 168 1
16 BD+38 3623 gD* 19 30 35.7781417814 +38 35 16.640287865   10.28 9.91     F1V 12 0
17 TYC 3139-151-1 Pu* 19 31 05.2530071002 +39 52 24.795461774   9.95 9.62     ~ 5 0
18 KIC 10080943 gD* 19 36 27.3038490416 +47 05 02.151901935   12.40 11.65     F6II 32 0
19 TYC 3144-646-1 gD* 19 48 33.7198147622 +41 49 49.230031372   10.78 10.83     B3V 12 0

    Equat.    Gal    SGal    Ecl

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2019.10.15-19:51:44

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