Other
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492..190a&link_type=abstract
Astrophysical Journal v.492, p.190
Other
55
Galaxy: Halo, Galaxy: Stellar Content, Galaxy: Structure, Cosmology: Gravitational Lensing, Stars: Variables: Other Rr Lyrae
Scientific paper
Mean colors and magnitudes of RR Lyrae stars in 24 fields toward the Galactic bulge from the MACHO database are presented. Accurate mean reddenings are computed for these fields on the basis of the mean colors. The distribution along the line of sight of the RR Lyrae population is examined on the basis of the mean magnitudes, and it is shown that the bulk of the RR Lyrae population is not barred. Only the RR Lyrae stars in the inner fields closer to the Galactic center (l < 4 deg, b > -4 deg) show evidence for a bar. The red giant clump stars in the MACHO fields, however, clearly show a barred distribution, confirming the results of previous studies. Given the different spatial distribution, the RR Lyrae stars and the clump giants trace two different populations. The RR Lyrae variables would represent the inner extension of the Galactic halo in these fields.
Alcock Charles
Allsman R. A.
Alves David R.
Axelrod Tim S.
Baskett L.
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