The effect of metallicity on the empirical relations for RR Lyrae stars |
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| Authors: | H S Mahra S D Sinvhal |
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| Institution: | (1) Uttar Pradesh State Observatory, Manora Peak, Naini Tal, India;(2) Present address: Kumaun University, 263001 Naini Tal, India |
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| Abstract: | It has empirically been shown that, for a given value of the effective temperature, the correction in (B-V) due to line blanketing varies linearly with the metallicity parameter  S. Next, on the basis of considerations different from those used to obtain a similar result by Sturch (1966), a relation between reciprocal effective temperature
e
(=5040/T
e
) and intrinsic line-free colour index(B-V)
o,c
has been obtained based on the
e
and (B-V) values for five RR Lyr variables. Relations between
e
and intrinsic colour(B-V)
o
for different groups of stars having a S parameter in the range 0 S11 have also been obtained. |
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| Keywords: | |
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