Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semiregular variables with periods lying between the period-luminosity
  sequences C', C and D   We analyze the distribution of semiregular variables and Mira stars in the
period-luminosity plane. Our sample consists of 6169 oxygen-rich long-period
variables in the Large Magellanic Cloud included in the OGLE-III Catalog of
Variable Stars. There are many stars with periods that lie between the well
known sequences C and C'. Most of these stars are multi-periodic and the period
ratios suggest that these stars oscillate in the same mode as the sequence C
stars. Models suggest that this mode is the fundamental radial pulsation mode.
The stars with primary periods between sequences C and C' preferentially lie on
an additional sequence (named F), and a large fraction of these stars also have
long secondary periods that lie between sequences C and D. There are also a
small number of stars with primary periods lying between sequences C and D. The
origin of this long period variability is unknown, as is the cause of sequence
D variability. In addition, the origin of sequence F is unknown but we
speculate that sequence F variability may be excited by the same phenomenon
that causes the long secondary periods.

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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
37
The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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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: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th