Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The effect of metallicity on the Cepheid P-L relation, from a
  Baade-Wesselink analysis of SMC Cepheids   We present results based on a Baade-Wesselink analysis of Cepheids in the
Small Magellanic Cloud. The Baade-Wesselink analysis provides individual
luminosities for these metal-poor Cepheids which combined with recent
Baade-Wesselink results from Gieren et al. (1998) on solar metallicity Galactic
Cepheids constrain the metallicity effect on the zero-point of the Cepheid P-L
relation. A preliminary analysis leads to an effect of dMv / d[Fe/H]= -0.45
+-0.15, metal-rich Cepheids being brighter, in good agreement with several
recent independent determinations. An effect of this magnitude reduces
significantly the current disagreement between the long and the short distance
estimates to the LMC, and favors a shorter value.

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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess