On the physical meaning of the 2.1 keV absorption feature in 4U 1538-52

J. J. Rodes Roca, J. M. Torrejón, S. Martínez-Núñez +1

The improvement of the capabilities of nowadays X-ray observatories, like Chandra or XMM-Newton, offers the possibility to detect both absorption and emission lines and to study th…