A survey of halo RR Lyrae stars

Details A survey of halo RR Lyrae stars A survey of halo RR Lyrae stars

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........3s&link_type=abstract

Ph.D. Thesis California Inst. of Tech., Pasadena.

Physics

7

Electrophotometry, Lyra Constellation, Schmidt Telescopes, Stars, Interstellar Extinction, Radial Velocity, Spectrometers

Scientific paper

A search for RR Lyrae stars has been conducted in selected regions of the Galactic halo, using the 48 inch Schmidt telescope at Palomar 29 RR Lyrae stars were found in three fields (each 42 square degrees). The faint limit for finding RR Lyraes is 19(m) 5 in B, and the faintest RR Lyrae stars that were found are at Galactocentric distances of over 40 kpc. Apart from a very few globular clusters, these stars are the most distant probes to the outer halo. Photoelectric photometry has been used to obtain accurate light curves and ephemerides for all the survey RR Lyrae stars. Spectrophotometry at minimum light has been used to estimate reddening and interstellar extinction. Distances to the individual RR Lyrae stars have been derived using the above. The space density of RR Lyrae stars has been traced out to a Galactocentric distance R of 33 kpc.

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