Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital and physical parameters of eclipsing binaries from the ASAS
  catalogue - VIII. The totally-eclipsing double-giant system HD 187669   We present the first full orbital and physical analysis of HD 187669,
recognized by the All-Sky Automated Survey (ASAS) as the eclipsing binary ASAS
J195222-3233.7. We combined multi-band photometry from the ASAS and SuperWASP
public archives and 0.41-m PROMPT robotic telescopes with our high-precision
radial velocities from the HARPS spectrograph. Two different approaches were
used for the analysis: 1) fitting to all data simultaneously with the WD code,
and 2) analysing each light curve (with JKTEBOP) and RVs separately and
combining the partial results at the end. This system also shows a total
primary (deeper) eclipse, lasting for about 6 days. A spectrum obtained during
this eclipse was used to perform atmospheric analysis with the MOOG and SME
codes in order to constrain physical parameters of the secondary.
  We found that ASAS J195222-3233.7 is a double-lined spectroscopic binary
composed of two evolved, late-type giants, with masses of $M_1 = 1.504\pm0.004$
and $M_2=1.505\pm0.004$ M$_\odot$, and radii of $R_1 = 11.33\pm0.28$ and
$R_2=22.62\pm0.50$ R$_\odot$, slightly less metal abundant than the Sun, on a
$P=88.39$ d orbit. Its properties are well reproduced by a 2.38 Gyr isochrone,
and thanks to the metallicity estimation from the totality spectrum and high
precision in masses, it was possible to constrain the age down to 0.1 Gyr. It
is the first so evolved galactic eclipsing binary measured with such a good
accuracy, and as such is a unique benchmark for studying the late stages of
stellar evolution.

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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph