Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90...95k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Jan. 1985, p. 95-100.
Astronomy and Astrophysics
Astronomy
11
Astrography, Cepheid Variables, Metallicity, Milky Way Galaxy, Star Distribution, Stellar Composition, Hydrogen, Image Tubes
Scientific paper
Preston Δs values are given for 36 RR Lyrae variables in the Lick Astrograph field RR I (l = 11°, b = +29°). Thirty-four of these variables are of type a and account for over 80% of the variables of this type in this field. Their >Δs< = 5.80±0.39 and differs significantly from the >Δs< = 7.65±0.22 of the 52 RR Lyraes which have previously been observed in the north galactic pole and anticenter regions of the halo. It is shown that this difference is not produced by the differing z distributions of the two samples, but is related to their differing galactocentric distances. Δs shows a continuous monotonic increase with the galactocentric distance.
Friel Eileen
Kinman Thomas D.
Kraft Ralph Porter
Suntzeff Nicholas B.
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