2016A&A...592A.140L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET07:50:53

2016A&A...592A.140L - Astronomy and Astrophysics, volume 592A, 140-140 (2016/8-1)

Spot modelling of periodic weak-line T Tauri stars observed by CoRoT in NGC 2264.

LANZA A.F., FLACCOMIO E., MESSINA S., MICELA G., PAGANO I. and LETO G.

Abstract (from CDS):

Context. The space telescope CoRoT has provided light curves of T Tauri stars belonging to the star-forming region of NGC 2264 with unprecedented continuity and precision in the framework of a coordinated multi-wavelength observational project.
Aims. We perform spot modelling of the optical light curves of five weak-line T Tauri stars whose variability is dominated by starspots.
Methods. We apply two-spot and evolving single-spot models in the framework of a Bayesian Markov chain Monte Carlo approach to derive the a posteriori distributions of the starspot parameters and the inclination of the star rotation axis. We focus on the rotation periods of the spots that can provide evidence for differential rotation in those stars.
Results. We find meaningful results in the case of three stars with an inclination higher than 50° and a slow variation of the light curve amplitude. The relative difference of the spot rotation periods ranges from 0.02 to 0.05 that is 3-10 times larger than the amplitude of the differential rotation found in similar stars with Doppler imaging techniques.
Conclusions. We conclude that the intrinsic starspot evolution, although very slow, has a significant impact on the determination of the differential rotation by means of our spot modelling approach. We estimate typical timescales for the evolution of the starspot pattern between ∼20 and ∼50 rotation periods in our stars.

Abstract Copyright: © ESO, 2016

Journal keyword(s): stars: variables: T Tauri, Herbig Ae/Be - starspots - stars: activity - stars: rotation - techniques: photometric

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME the Cold Spot ? 03 13 -20.5           ~ 48 0
2 EM* LkCa 4 Or* 04 16 28.1070192558 +28 07 35.732032828   13.96 12.78 11.825   K7:Ve 154 0
3 V* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 435 0
4 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129092   14.81 13.04 12.240   K7 198 1
5 V* V830 Tau TT* 04 33 10.0299730541 +24 33 43.255853678   13.91 12.08 11.30   M0-1 179 1
6 Cl* NGC 2264 VAS 2 TT* 06 39 41.5726717120 +09 34 40.512558131 14.3 14.1 13.27 12.84 12.42 G0 30 0
7 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1616 0
8 V* V353 Mon TT* 06 41 00.7843270915 +09 51 22.210098362 16.6 15.84 14.61 13.92 13.18 K4/5e 38 0
9 V* V605 Mon Or* 06 41 01.4158456239 +09 34 08.184158463 16.75 15.85 14.66 13.97 13.30 K5 43 0
10 V* V609 Mon TT* 06 41 07.2631796775 +09 58 31.138701985 17.33 16.37 15.08 14.37 13.61 K5 40 0
11 Cl* NGC 2264 VAS 181 TT* 06 41 32.4990710124 +09 38 07.402601051 16.61 15.84 14.66 14 13.26 K6 30 0
12 Kepler-30 Ro* 19 01 08.0746750853 +38 56 50.218666290   16.50   15.95 14.55 ~ 124 1

    Equat.    Gal    SGal    Ecl

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2021.03.07-07:50:53

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