Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..536l&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
Studies of the solar corona have found evidences of high-frequency low-energy flaring that would be enough to explain the heating of the solar corona. The same physical process is taking place in others stars. To date only three massive star-forming regions: Orion, Cygnus OB2 and Taurus have been studied in detail. The aim of this work is to perform a similar study in the supermassive star-cluster Trumpler 16. Also, we studied the relationship, if any, between the presence of a circumestelar disk and the flare frequency. Through a maximum likelihood algorithm, we have characterized the variability of the stars in our sample and obtained the flare frequency and energy distribution. In this work, we present the first results. The selection of stars with infrared excesses has been made using an independent extinction index. We detected 129 flares in the 1035 X-ray sources of Trumpler 16. Flare energy distribution can be described as a power law with an index alpha = -1.86 +/- 0.01. Approximately 11.8% of the stars with a disk had a flare (14.3% of the stars without a disk). The flare energy distribution shape suggests micro-flaring may play an important role in the coronal heating, although probably it is not the only process.
Albacete-Colombo Juan Facundo
de Castro Elisa
Lopez-Garcia Miguel Angel
Lopez-Santiago Javier
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