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@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",
        urlaccessdate = "01 dez. 2020"
}


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