The Slope of the RR Lyrae Variables M_v,f[Fe/H] Relation

Details The Slope of the RR Lyrae Variables M_v,f[Fe/H] Relation The Slope of the RR Lyrae Variables M_v,f[Fe/H] Relation

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111..489m&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 758, pp. 489-493.

Astronomy and Astrophysics

Astronomy

10

Stars: Horizontal-Branch, Stars: Variables: Rr Lyrae Variable

Scientific paper

We discuss the slope of the RR Lyrae variables M_v,[Fe-H] relation by two independent methods. We show that the slope is 0.32 if Baade-Wesselink M_v values are used only for stars with [Fe/H]>-1.5. Because the metal abundances of the variables are constant or nearly so for a large range of periods (the Oosterhoff I variables with log P values in the range -0.29 to -0.215), a flat section in the M_v,[Fe-H] relation is produced that tends to reduce the slope if stars with log[Fe/H]<-1.5 are included in the solution. An analysis of data on RR Lyrae stars in the Galactic bulge yields a slope of ~0.31.

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