X-Ray Spectral Characterization of the Young Cygnus OB2 Population

FLACCOMIO, E.; ALBACETE COLOMBO, J. F; DRAKE, J. J.; GUARCELLO, M.G.; KASHYAP, V.; WRIGHT, N. J.; BRIGGS, K.; ERCOLANO, B.; SCIORTINO, S.

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES

IOP PUBLISHING LTD

Lugar: Londres; Año: 2023 vol. 269

0067-0049

We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray luminosities. We adopt two different strategies for X-ray sources for which more or less than 20 photons were detected. For the brighter sample we fit the spectra with absorbed isothermal models. In order to limit uncertainties, for most of the fainter Cygnus OB2 members in this sample we constrain the spectral parameters to characteristic ranges defined from the brightest stars. For X-ray sources with