2018A&A...610A..86S


Query : 2018A&A...610A..86S

2018A&A...610A..86S - Astronomy and Astrophysics, volume 610A, 86-86 (2018/2-1)

Investigating light curve modulation via kernel smoothing. I. Application to 53 fundamental mode and first-overtone Cepheids in the LMC.

SUVEGES M. and ANDERSON R.I.

Abstract (from CDS):

Context. Recent studies have revealed a hitherto unknown complexity of Cepheid pulsations by discovering irregular modulated variability using photometry, radial velocities, and interferometry.
Aim. We aim to perform a statistically rigorous search and characterization of such phenomena in continuous time, applying it to 53 classical Cepheids from the OGLE-III catalog.
Methods. We have used local kernel regression to search for both period and amplitude modulations simultaneously in continuous time and to investigate their detectability. We determined confidence intervals using parametric and non-parametric bootstrap sampling to estimate significance, and investigated multi-periodicity using a modified pre-whitening approach that relies on time-dependent light curve parameters.
Results. We find a wide variety of period and amplitude modulations and confirm that first overtone pulsators are less stable than fundamental mode Cepheids. Significant temporal variations in period are more frequently detected than those in amplitude. We find a range of modulation intensities, suggesting that both amplitude and period modulations are ubiquitous among Cepheids. Over the 12-year baseline offered by OGLE-III, we find that period changes are often nonlinear, sometimes cyclic, suggesting physical origins beyond secular evolution. Our method detects modulations (period and amplitude) more efficiently than conventional methods that are reliant on certain features in the Fourier spectrum, and pre-whitens time series more accurately than using constant light curve parameters, removing spurious secondary peaks effectively.
Conclusions. Period and amplitude modulations appear to be ubiquitous among Cepheids. Current detectability is limited by observational cadence and photometric precision: detection of amplitude modulation below 3 mmag requires space-based facilities. Recent and ongoing space missions (K2, BRITE, MOST, CoRoT) as well as upcoming ones (TESS, PLATO) will significantly improve detectability of fast modulations, such as cycle-to-cycle variations, by providing high-cadence high-precision photometry. High-quality long-term ground-based photometric time series will remain crucial to study longer-term modulations and to disentangle random fluctuations from secular evolution.

Abstract Copyright: © ESO 2018

Journal keyword(s): methods: data analysis - methods: statistical - stars: variables: Cepheids - stars: oscillations - Magellanic Clouds

Simbad objects: 65

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Number of rows : 65
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10205 1
2 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 641 2
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6285 1
4 V* SZ Tau cC* 04 37 14.7776556504 +18 32 34.926940860 7.65 7.13 6.37     F6.7:Ib 297 0
5 SV* HV 887 cC* 05 02 10.2713664432 -69 32 23.708577804   14.84 14.208 13.62 13.231 ~ 26 0
6 OGLE LMC-CEP-916 cC* 05 05 43.6134899304 -69 06 58.699680516     16.764   16.062 ~ 10 0
7 OGLE LMC-CEP-1119 cC* 05 09 26.8465832904 -68 50 35.881383372   16.71 16.300 15.89 15.617 ~ 12 0
8 SV* HV 908 cC* 05 09 56.3310707184 -68 59 40.535268360   15.09 14.600 14.15 13.911 ~ 18 0
9 OGLE LMC-CEP-1275 cC* 05 13 30.9960030192 -69 06 27.548545572     17.088   16.417 ~ 10 0
10 SV* HV 5706 cC* 05 15 53.7875091504 -69 02 23.023506408   16.092 15.523   14.857 ~ 9 0
11 OGLE LMC-CEP-1418 cC* 05 16 00.4286928408 -68 57 07.148681820   16.865 16.245   15.531 ~ 12 0
12 SV* HV 2443 cC* 05 17 56.3242098024 -69 47 21.248254608   16.717 16.166   15.442 ~ 12 0
13 V* TW Dor cC* 05 18 00.8615080512 -69 44 10.946083236   15.862 15.353   14.680 ~ 11 0
14 OGLE LMC-CEP-1527 cC* 05 18 06.4099193136 -68 57 15.018066468     16.484   15.830 ~ 9 0
15 OGLE LMC-CEP-1535 cC* 05 18 10.0539270432 -69 50 55.861956960     16.574   15.928 ~ 10 0
16 OGLE LMC-CEP-1536 cC* 05 18 11.6115935424 -69 35 13.532421696     16.146   15.503 ~ 8 0
17 OGLE LMC-CEP-1543 cC* 05 18 28.0809627672 -69 27 46.047920976   16.54 15.787 15.37 14.972 ~ 13 0
18 SV* HV 5741 cC* 05 18 50.2508012952 -69 16 36.261726024   16.396 15.819   15.177 ~ 12 0
19 OGLE LMC-CEP-1561 cC* 05 18 51.2234604720 -69 26 41.555595840   17.05 16.546 16.18 15.813 ~ 7 0
20 OGLE LMC-CEP-1564 cC* 05 18 56.1871041624 -69 02 20.901669936   16.668 16.093   15.362 ~ 11 0
21 OGLE LMC-CEP-1582 cC* 05 19 22.08 -69 19 32.7   18.81 18.936   18.296 ~ 7 0
22 SV* HV 5757 cC* 05 19 43.7886063984 -69 22 53.832706860   15.645 15.157   14.601 ~ 10 0
23 SV* HV 2458 cC* 05 20 04.5205733760 -69 16 50.849087700   16.360 15.792   15.159 ~ 14 0
24 OGLE LMC-CEP-1638 cC* 05 20 23.3373915600 -69 34 24.163432788     15.708   15.222 ~ 9 0
25 OGLE LMC-CEP-1671 cC* 05 21 04.5619874129 -69 35 05.547400677   17.02 16.507 16.08 15.824 ~ 10 0
26 OGLE LMC-CEP-1693 cC* 05 21 31.92 -69 58 49.3   17.797 17.055   16.141 ~ 8 0
27 OGLE LMC-CEP-1698 cC* 05 21 37.2675204120 -69 16 46.530368904   17.081 16.520   15.828 ~ 9 0
28 OGLE LMC-CEP-1704 cC* 05 21 45.8660989224 -69 27 26.352655164   16.642 16.057   15.376 ~ 10 0
29 OGLE LMC-CEP-1711 cC* 05 21 50.3243609568 -69 45 57.920967252   16.278 15.526   14.677 ~ 11 0
30 SV* HV 944 cC* 05 22 19.3772732736 -69 37 54.746780052   15.643 14.977   14.258 ~ 13 0
31 SV* HV 12019 cC* 05 22 25.6058446776 -69 49 29.386491132   16.820 16.288   15.573 ~ 14 0
32 OGLE LMC-CEP-1754 cC* 05 22 26.4466686576 -70 21 45.709477992     17.548   16.871 ~ 8 0
33 OGLE LMC-CEP-1772 cC* 05 22 33.92 -69 37 13.8   17.574 17.032   16.442 ~ 7 0
34 SV* HV 2488 cC* 05 23 29.0370782784 -69 18 37.542477888   14.986 14.064   13.158 ~ 14 0
35 OGLE LMC-CEP-1838 cC* 05 23 33.1517749512 -69 43 39.597340008   16.859 16.294   15.648 ~ 9 0
36 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
37 OGLE LMC-CEP-1911 cC* 05 24 59.0091500256 -69 18 15.354352476   17.687 17.265   16.714 ~ 10 0
38 SV* HV 956 cC* 05 25 24.1205369832 -69 44 57.383378412   16.306 15.803   15.171 ~ 13 0
39 OGLE LMC-CEP-1937 cC* 05 25 27.3931171392 -69 29 43.211028768   17.441 16.969   16.364 ~ 10 0
40 OGLE LMC-CEP-1955 cC* 05 25 39.7892602464 -70 01 32.874019608   17.03 16.422 16.00 15.668 ~ 10 0
41 OGLE LMC-CEP-1998 cC* 05 26 28.8696655152 -69 51 20.063803464   16.61 15.933 15.70 15.267 ~ 13 0
42 OGLE LMC-CEP-2103 cC* 05 28 39.62 -70 00 46.2     18.671   18.051 ~ 5 0
43 OGLE LMC-CEP-2118 cC* 05 29 02.8973250432 -69 53 24.874755540   16.32 15.723 15.37 15.060 ~ 13 0
44 SV* HV 2584 cC* 05 29 21.4335997560 -69 27 59.578475724   15.63 15.442 14.93 14.634 ~ 14 0
45 SV* HV 2592 cC* 05 30 14.5049977296 -69 44 22.397750052   16.38 16.163 15.68 15.525 ~ 13 0
46 SV* HV 989 cC* 05 30 27.7838224296 -69 56 40.631496684   15.99 15.497 15.11 14.847 ~ 13 0
47 SV* HV 2610 cC* 05 30 48.6990378312 -69 48 47.915598852   16.76 16.105 15.74 15.354 ~ 14 0
48 OGLE LMC-CEP-2217 cC* 05 30 52.0112333928 -69 56 47.006128392   18.90 15.563 15.96 14.895 ~ 12 0
49 SV* HV 2614 cC* 05 31 00.9015876888 -69 45 32.400587088   16.20 15.453 15.19 14.764 ~ 14 0
50 OGLE LMC-CEP-2264 cC* 05 31 38.3865000936 -69 56 53.632403556   16.81 16.081 15.71 15.273 ~ 14 0
51 SV* HV 2638 cC* 05 32 02.5333888104 -69 38 14.085034296   16.490 15.915   15.141 ~ 13 0
52 OGLE LMC-CEP-2310 cC* 05 32 27.8087939424 -69 34 17.270182812   17.688 17.086   16.396 ~ 10 0
53 SV* HV 2688 cC* 05 35 11.34 -69 57 46.8     16.016   15.291 ~ 12 0
54 OGLE LMC-CEP-2500 cC* 05 35 34.9138250472 -70 05 25.062329904     16.072   15.259 ~ 12 0
55 SV* HV 12626 cC* 05 36 46.0519383576 -70 57 30.866906448     16.183   15.439 ~ 6 0
56 OGLE LMC-CEP-2774 cC* 05 39 06.8818845912 -70 07 42.184881516     16.92 16.35 15.746 ~ 13 0
57 OGLE LMC-CEP-2820 cC* 05 39 44.777 -70 19 13.79   18.44 17.33 16.70 16.119 ~ 10 0
58 OGLE LMC-CEP-2977 cC* 05 42 15.8923661352 -70 05 40.636053348     18.210   17.476 ~ 8 0
59 * 48 Aur cC* 06 28 34.0881845487 +30 29 34.929596860 6.73 6.23 5.55   4.777 F5.5-G0Ib 373 0
60 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 336 0
61 V* U Car cC* 10 57 48.1866744768 -59 43 55.883482140 8.31 7.21 6.11   5.073 G5/8Iab 224 0
62 V* V473 Lyr cC* 19 15 59.4893949000 +27 55 34.686262056 7.18 6.770 6.153     F8Ib-II 210 0
63 V* V1154 Cyg cC* 19 48 15.4661680536 +43 07 36.960514968   9.92 9.14   8.120 G0 91 0
64 V* T Vul cC* 20 51 28.2383768376 +28 15 01.819622952 6.89 6.49 5.77   5.061 F5Ib+A0.8V 332 0
65 NAME Galactic Bulge reg ~ ~           ~ 3848 0

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2022.05.28-09:48:02

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