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- W2071399288 abstract "view Abstract Citations (17) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Period Change Rates for 46 RR Lyrae Stars in NGC 7006 Wehlau, Amelia ; Nemec, James M. ; Hanlan, Patricia ; Rich, R. M. Abstract Period change rates are presented for 46 RR Lyrae stars in the globular cluster NGC 7006 based on previously published photometry of photographic plates taken in the 1930s and 1950s by Hubble and Sandage, and new photometry of 35 photographic plates taken in 1984 with the Palomar 60 in telescope. The mean period change rate for the 42 RRab stars is (beta) = -0.06 +/- 0.04 d/Myr and the median is -0.04, which, for the horizontal branch (HB) type of NGC 7006, is one standard error below the median value of beta predicted by the Yale evolutionary HB models. Statistically significant evidence for a radial gradient in the (beta) values (in the sense that the beta values are more negative in the outer region of the cluster than in the inner) is also presented and discussed. Publication: The Astronomical Journal Pub Date: May 1992 DOI: 10.1086/116171 Bibcode: 1992AJ....103.1583W Keywords: Blue Stars; Giant Stars; Globular Clusters; Stellar Spectrophotometry; Variable Stars; Astronomical Photography; Charge Coupled Devices; Light Curve; Photographic Plates; Astrophysics; STARS: VARIABLES: RR LYRAE; STARS: OSCILLATIONS full text sources ADS | data products SIMBAD (3)" @default.
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- W2071399288 date "1992-05-01" @default.
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- W2071399288 title "Period change rates for 46 RR Lyrae stars in NGC 7006" @default.
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