2015A&A...583A.134F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:35:20

2015A&A...583A.134F - Astronomy and Astrophysics, volume 583A, 134-134 (2015/11-1)

Stellar cycles from photometric data: CoRoT stars.

FERREIRA LOPES C.E., LEAO I.C., DE FREITAS D.B., CANTO MARTINS B.L., CATELAN M. and DE MEDEIROS J.R.

Abstract (from CDS):

Until a few years ago, the amplitude variation in the photometric data had been explored to a limited extent mainly because of time resolution and photometric sensitivity limitations. This investigation is now possible thanks to the Kepler and CoRoT databases which provide a unique set of data for studying the nature of stellar variability cycles. The present study characterizes the amplitude variation in a sample of main-sequence stars with light curves collected using CoRoT exofield CCDs. We analyze potential stellar activity cycles by studying the variability amplitude over small boxes. The cycle periods and amplitudes were computed based on the Lomb-Scargle periodogram, harmonic fits, and visual inspection. As a first application of our approach, we considered the photometric data for 16 CoRoT FGK main sequence stars, revisited during the IRa01, LRa01 and LRa06 CoRoT runs. The 16 CoRoT stars appear to follow the empirical relations between activity cycle periods (Pcyc) and the rotation period (Prot) found by previous works. In addition to the so-called A (active) and I (inactive) sequences previously identified, there is a possible third sequence, here named S (short-cycles) sequence. However, recovery fractions estimated from simulations suggest that only a half of our sample has confident cycle measurements. Therefore, more study is needed to verify our results, and Kepler data will clearly be useful for such a study. Overall, our procedure provides a key tool for exploring the CoRoT and Kepler databases to identify and characterize stellar cycle variability.

Abstract Copyright:

Journal keyword(s): dynamo - methods: data analysis - Sun: activity - Sun: magnetic fields - stars: activity - stars: evolution

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 CoRoT 102712791 * 06 43 55.1249393565 -00 57 37.297941740   15.485 14.847 14.907   G4IV 2 0
2 CoRoT 102720703 * 06 44 06.3946606677 -01 02 18.443252036           K3 2 0
3 CoRoT 102721955 * 06 44 08.1131802082 -00 51 54.565933176   16.487 15.632 15.406   K0IV 1 0
4 CoRoT 102723038 V* 06 44 09.6856546902 -01 11 42.459637888     15.323     G8 3 0
5 2MASS J06441430-0113444 SB* 06 44 14.3088362099 -01 13 44.434049048     14.541     G5III 7 0
6 CoRoT 102738457 * 06 44 31.0436734824 -00 48 08.155774069     13.635     G5V 3 0
7 CoRoT 102749950 * 06 44 46.4107248221 -00 44 28.766620341           G1 2 0
8 CoRoT 102750723 V* 06 44 47.4247676272 -01 00 14.976071672     14.535     G1 3 0
9 CoRoT 102752622 Ro* 06 44 49.9170343813 -01 03 54.410497712     13.860     F9IV 4 0
10 CoRoT 102754736 * 06 44 52.8127524571 -01 13 08.695989229           K2 2 0
11 CoRoT 102758108 * 06 44 57.3818748796 -00 40 49.903075015     15.034     G5V 3 0
12 CoRoT 102770332 * 06 45 13.9269289200 -00 35 51.508790296           G7 2 0
13 CoRoT 102770893 V* 06 45 14.7416436925 -01 13 00.855071843   16.252 15.367 15.246   ~ 2 0
14 CoRoT 102777006 * 06 45 23.0317278867 -00 36 52.957781415           ~ 2 0
15 CoRoT 102778595 * 06 45 25.0559383307 -01 03 27.875786258   16.505 15.649 15.552   K0IV 1 0
16 CoRoT 102780281 * 06 45 27.3084004054 -00 40 57.068853520     13.574     F7IV 4 0
17 HD 49385A PM* 06 48 11.5030662194 +00 18 17.893672741   7.952 7.399 8.28   G0V 73 1
18 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 326 1
19 HD 52265 PM* 07 00 18.0357152121 -05 22 01.778490073   6.845 6.282     G0V 286 1
20 HD 181420 PM* 19 20 27.0723438937 -01 18 35.134035438   6.98 6.55     F6V 79 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:35:20

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