Interstellar oxygen along the line of sight of Cygnus X-2
نویسندگان
چکیده
منابع مشابه
Oxygen isotopic ratios in galactic clouds along the line of sight towards Sagittarius B 2 ⋆
As an independent check on previous measurements of the isotopic abundance of oxygen through the Galaxy, we present a detailed analysis of the ground state rotational lines of 16 OH and 18 OH in absorption towards the giant molecular cloud complex, Sagittarius B2. We have modelled the line shapes to separate the contribution of several galactic clouds along the line of sight and calculate 16 OH...
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The distance to the black hole binary GX 339–4 remains a topic of debate. We examine high-resolution optical spectra of the Na D lines resolving the velocity structure along the line of sight. We find this to be complex, with at least nine components, mostly blue-shifted, spanning a velocity range of nearly 200 km s −1. The presence of components with a large blue-shift rules out a nearby locat...
متن کاملOn the Spectral Evolution of Cygnus X–2 along its Color-Color Diagram
We report on the results of a broad band (0.1– 200 keV) spectral study of Cyg X–2 using two BeppoSAX observations taken in 1996 and 1997, respectively, for a total effective on-source time of ∼ 100 ks. The color-color (CD) and hardness-intensity (HID) diagrams show that the source was in the horizontal branch (HB) and normal branch (NB) during the 1996 and 1997 observation, respectively. Five s...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/202038749