J/AJ/113/1073 Abundances in Cepheid Variables (Fry+ 1997)
Chemical Abundances of Galactic Cepheid Variables That Calibrate
the P-L Relation
Fry A.M., Carney B.W.
<Astron. J. 113, 1073 (1997)>
=1997AJ....113.1073F 1997AJ....113.1073F
ADC_Keywords: Stars, variable ; Equivalent widths
Abstract:
We have completed spectroscopic studies of 23 Galactic cepheids to
determine possible metallicity effects on measuring the zero point of
the P-L relation. We find a spread of 0.4dex in [Fe/H], which is not
the result of either observational scatter or of a metallicity
gradient within the Galactic disk. We find a smaller, less significant
spread of 0.2dex in [α/Fe]. Our results are robust, determined by
constancy of [Fe/H] derived at differing temperatures throughout the
pulsational cycle, and abundances of two dwarfs compared to U Sgr in
the cluster M25. We discuss briefly the effect of metallicity on the
P-L relation. We also argue that EV Sct and QZ Nor are overtone
pulsators, and that the latter is not a member of the cluster
NGC 6067.
(Copyright) 1997 American Astronomical Society.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 53 7719 Equivalent widths of Fe I and Fe II
table3 53 1073 Equivalent widths of Alpha-peak elements
table2.tex 104 1296 AASTeX version of Tables 2a to 2o
table3.tex 80 223 AASTeX version of Tables 3a to 3d
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Byte-by-byte Description of file: table2 table3
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Star name
14- 18 F5.3 --- phi [0/1[? Phase
20- 26 F7.2 0.1nm lambda Line wavelength
28- 34 F7.2 0.1pm EW ? Equivalent width
36- 40 A5 --- Ion Ion designation
42- 47 F6.3 --- log(gf) ? log of oscillator strength
50- 53 F4.2 eV Chi ? Chi value
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Origin :AAS CD-ROM series, Volume 8, 1997 Lee Brotzman [ADS] 10-Apr-1997
(End) Patricia Bauer [CDS] 04-Jul-1997