Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemical and physical parameters from X-ray high resolution spectra of
  the Galactic nova V959 Mon   Two observations of V959 Mon, done using the Chandra X-ray gratings during
the late outburst phases (2012 September and December), offer extraordinary
insight into the physics and chemistry of this Galactic ONe nova. the X-ray
flux was 1.7 x 10(-11) erg/cm(2)/s and 8.6 x 10(-12) erg/cm(2)/s, respectively
at the two epochs. The first result, coupled with electron density diagnostics
and compared with published optical and ultraviolet observations, indicates
that most likely in 2012 September the X-rays originate from a very small
fraction of the ejecta, concentrated in very dense clumps. We obtained a fairly
good fit to the September spectrum with a model of plasma in collisional
ionization equilibrium (CIE) with two components; one at a temperature of 0.78
keV, blueshifted by 710-930 km/s, the other at a temperature of 4.5 keV, mostly
contributing to the high-energy continuum. However, we cannot rule out a range
of plasma temperatures between these two extremes. In December, the central
white dwarf (WD) became visible in X-rays. We estimate an effective temperature
of about 680,000 K, consistent with a WD mass ~1.1 M(sol). The WD flux is
modulated with the orbital period, indicating high inclination, and two
quasi-periodic modulations with hour timescales were also observed. No hot
plasma component with temperature above 0.5 keV was observed in December, and
the blue-shifted component cooled to kT~0.45 keV. Additionally, new emission
lines due to a much cooler plasma appeared, which were not observed two months
earlier. We estimate abundances and yields of elements in the nova wind that
cannot be measured in the optical spectra and confirm the high Ne abundance
previously derived for this nova. We also find high abundance of Al, 230 times
the solar value, consistently with the prediction that ONe novae contribute to
at least 1/3rd of the Galactic yield of Al(26).

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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat