Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Masses of the components of the HDE 226868/Cyg X-1 binary system   Recent determination of the distance to HDE 226868/Cyg X-1 binary system
(Reid et al., 2011) and more precise determination of the effective temperature
of HDE 226868 (Caballero- Nieves et al., 2009) permit a more accurate estimate
of the masses of both components. Using up to date evolutionary models, I
obtain a mass range of between 25 to 35 Msun for the mass of the supergiant and
between 13 to 23 Msun for the mass of the black hole. Accepting more liberal
estimates of uncertainties in both the distance and the effective temperature,
one may extend these ranges to 21 to 35 Msun and 10 to 23 Msun for both masses,
respectively. The most likely values within these ranges are, respectively, 27
Msun and 16 Msun. The obtained mass of black hole agrees with the value 15 +- 1
Msun suggested by Orosz et al. (2011). However, the value suggested by them for
the mass of the supergiant of 19 +- 2 Msun should not be used as such a star
violates the mass-luminosity relation for the the massive core hydrogen burning
stars. This consideration was not incorporated into the iterative process of
Orosz et al. To resolve this violation I consider the possibility that the
hydrogen content of HDE 222268 might be lowered as a result of the mass
transfer and the induced fast rotation of the mass gainer. I analyzed the
evolutionary effects of such situation and found that, while important, they do
not invalidate the conclusions listed above. If, as a result of the rotation
induced mixing, the present hydrogen content of HDE 226868 is equal about 0.6
(as suggested by some observational data), then its present mass may be
somewhat lower: about 24 Msun rather than about 27 Msun.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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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: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: math