@InProceedings{AvilaKueWilBraStu:2018:XmObAr,
author = "Avila, Manuel Castro and Kuehnel, Matthias and Wilms, Joern and
Braga, Jo{\~a}o and Stubert, Ruediger",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Friedrich-Alexander University Erlangen-Nuermberg} and
{Friedrich-Alexander University Erlangen-Nuermberg} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Low energy x-ray line emission from her x-1: xmm-newton/rgs
observations around the turn-on",
year = "2018",
organization = "Cospar Scientific Assembly, 42.",
abstract = "Her X-1 is a bright intermediate-mass X-ray binary system
consisting of a pulsar with a 1.24- s rotational period and a
1.7-d orbital period. The neutron star accretes matter from its
A/F donor through an accretion disk. The accretion disk is warped,
tilted, and precessing causing a 35-d variation cycle that affects
the emission from the central source. This 35-d cycle is
characterised by states of high X-ray flux (main-on and short-on)
and low-states with intensity of 3% of the main-on intensity.
During the turn-on of the main-on the accretion disk completely
opens up our view onto the neutron star. During this time we are
able to observe emission directly from the central source, and
scattering and absorption features caused by an atmosphere. We
observed Her X-1 four times during this phase. We will present RGS
data analysis, showing the detected lines at specific stages
before, during, and after the turnon. Measurements of the line
evolution at each stage enables us to constrain the emission
region and measure the structure and geometry of the disk
atmosphere.",
conference-location = "Pasadena, California",
conference-year = "14-22 July",
language = "en",
targetfile = "avila_low.pdf",
urlaccessdate = "29 mar. 2024"
}