Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Classical Cepheids Require Enhanced Mass Loss   Measurements of rates of period change of Classical Cepheids probe stellar
physics and evolution. Additionally, better understanding of Cepheid structure
and evolution provides greater insight into their use as standard candles and
tools for measuring the Hubble constant. Our recent study of the period change
of the nearest Cepheid, Polaris, suggested that it is undergoing enhanced mass
loss when compared to canonical stellar evolution model predictions. In this
work, we expand the analysis to rates of period change measured for about 200
Galactic Cepheids and compare them to population synthesis models of Cepheids
including convective core overshooting and enhanced mass loss. Rates of period
change predicted from stellar evolution models without mass loss do not agree
with observed rates whereas including enhanced mass loss yields predicted rates
in better agreement with observations. This is the first evidence that enhanced
mass loss as suggested previously for Polaris and delta Cephei must be a
ubiquitous property of Classical Cepheids.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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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: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th