Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: M75, a Globular Cluster with a Trimodal Horizontal Branch. II. BV
  Photometry of the RR Lyrae Variables   We present new BV CCD photometry, light curves, and ephemerides for 9
previously known, 29 newly detected RR Lyrae variables and one newly detected
variable of an unknown type in the globular cluster M75. The photometry used
for the detection of the additional variables was obtained with the image
subtraction package ISIS. The data were acquired on an observing run in July
1999 and range over 7 observing nights. Estimates of fundamental photometric
parameters are presented including intensity- and magnitude-averaged B and V
magnitudes, magnitude-averaged colors, pulsation periods, and pulsation
amplitudes. The mean period of the RRab variables, <P_ab> = 0.5868 d, and the
number fraction of RRc stars, N_c/N_RR = 0.342, are both large for an
Oosterhoff type I (OoI) globular cluster, suggesting that M75 may be
Oosterhoff-intermediate. Possible conflicts between Oosterhoff-type
determination based on the A_V - logP and A_B - logP diagrams are discussed.
The physical parameters of the RRc and RRab variables, as obtained from Fourier
decomposition of their light curves, do not show any clear deviation from
normal OoI behavior.

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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs