Soft coronal X-rays from \beta{} Pictoris
Solar and Stellar Astrophysics
2015-06-04 v1
Abstract
A type stars are expected to be X-ray dark, yet weak emission has been detected from several objects in this class. We present new Chandra/HRC-I observations of the A5 V star \beta{} Pictoris. It is clearly detected with a flux of 9+-2 10^{-4} counts/s. In comparison with previous data this constrains the emission mechanism and we find that the most likely explanation is an optically thin, collisionally dominated, thermal emission component with a temperature around 1.1 MK. We interpret this component as a very cool and dim corona, with \log L_X/L_{bol}=-8.2 (0.2-2.0 keV). Thus, it seems that \beta{} Pictoris shares more characteristics with cool stars than previously thought.
Keywords
Cite
@article{arxiv.1203.3242,
title = {Soft coronal X-rays from \beta{} Pictoris},
author = {H. M. Günther and S. J. Wolk and J. J. Drake and C. M. Lisse and J. Robrade and J. H. M. M. Schmitt},
journal= {arXiv preprint arXiv:1203.3242},
year = {2015}
}
Comments
accepted by ApJ, 5 pages, 2 figures