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J/A+A/312/111 [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
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Determination of [Fe/H] from the light curves of RR Lyrae stars.
Jurcsik J., Kovacs G.
<Astron. Astrophys. 312, 111 (1996)>
=1996A&A...312..111J (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, variable ; Abundances, [Fe/H]
Keywords: stars: variables - stars: oscillations - stars: horizontal-branch -
stars: abundances - globular clusters: general
Description:
We present an accurate and robust method for the calculation of [Fe/H]
from the light curves of RRab stars. The method introduces a
considerable improvement relative to our previously published
formulae. First of all, it uses an improved and extended data base for
the light curves and more accurate, very recent iron abundances.
Secondly, the new data base makes it possible to show that the basic
relation between [Fe/H] and the Fourier parameters is linear and
contains only the period and one of the Fourier phases, most
importantly {phi}_31_. Last but not least, we derive interrelations
among the Fourier parameters which help us to filter out peculiar
stars where more caution is needed in accepting the calculated
abundance. The applicability of the method is demonstrated on
independent samples of globular cluster stars. Peculiarities
encountered in Blazhko variables and in some other cases are also
discussed.
The Fourier decomposition is defined by the formula:
V(t) = A0 + A1*sin(2*pi/P*(t-t0)+phi1)
+ A2*sin(2*pi*2/P*(t-t0)+phi2) +...
+ A15*sin(2*pi*15/P*(t-t0)+phi15)
V(t) -- light curve in Johnson V
P -- period
t0 -- Epoch = 2400000.0
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 287 84 Fourier coefficients
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name (1)
11- 22 F12.10 d P Period
27- 32 F6.3 mag A0 Fourier coefficient A0
38- 40 I3 --- N Number of data point used
43- 48 F6.4 --- Sigma standard deviation
50- 56 F7.4 mag A1 Fourier coefficient A1
59- 64 F6.4 rad phi1 Fourier coefficient phi1
67- 72 F6.4 mag A2 Fourier coefficient A2
75- 80 F6.4 rad phi2 Fourier coefficient phi2
83- 88 F6.4 mag A3 Fourier coefficient A3
91- 96 F6.4 rad phi3 Fourier coefficient phi3
99-104 F6.4 mag A4 Fourier coefficient A4
107-112 F6.4 rad phi4 Fourier coefficient phi4
115-120 F6.4 mag A5 Fourier coefficient A5
123-128 F6.4 rad phi5 Fourier coefficient phi5
130-135 F6.4 mag A6 Fourier coefficient A6
138-143 F6.4 rad phi6 Fourier coefficient phi6
146-151 F6.4 mag A7 Fourier coefficient A7
154-159 F6.4 rad phi7 Fourier coefficient phi7
162-167 F6.4 mag A8 Fourier coefficient A8
170-175 F6.4 rad phi8 Fourier coefficient phi8
178-183 F6.4 mag A9 Fourier coefficient A9
186-191 F6.4 rad phi9 Fourier coefficient phi9
194-199 F6.4 mag A10 Fourier coefficient A10
202-207 F6.4 rad phi10 Fourier coefficient phi10
209-214 F6.4 mag A11 Fourier coefficient A11
217-222 F6.4 rad phi11 Fourier coefficient phi11
225-230 F6.4 mag A12 Fourier coefficient A12
233-238 F6.4 rad phi12 Fourier coefficient phi12
241-246 F6.4 mag A13 Fourier coefficient A13
249-254 F6.4 rad phi13 Fourier coefficient phi13
257-262 F6.4 mag A14 Fourier coefficient A14
265-270 F6.4 rad phi14 Fourier coefficient phi14
273-278 F6.4 mag A15 Fourier coefficient A15
281-286 F6.4 rad phi15 Fourier coefficient phi15
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Note (1): Asterisks denote the stars where the different segments of the data
sets were time and magnitude shifted.
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(End) Patricia Bauer [CDS] 30-Jan-1996