J/A+A/312/111 [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
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 1996A&A...312..111J
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 φ31. 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.dat 287 84 Fourier coefficients
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
9 A1 --- n_Name [*] Shifted segments of data (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 σ
50- 56 F7.4 mag A1 Fourier coefficient A1
59- 64 F6.4 rad phi1 Fourier coefficient φ1
67- 72 F6.4 mag A2 Fourier coefficient A2
75- 80 F6.4 rad phi2 Fourier coefficient φ2
83- 88 F6.4 mag A3 Fourier coefficient A3
91- 96 F6.4 rad phi3 Fourier coefficient φ3
99-104 F6.4 mag A4 Fourier coefficient A4
107-112 F6.4 rad phi4 Fourier coefficient φ4
115-120 F6.4 mag A5 Fourier coefficient A5
123-128 F6.4 rad phi5 Fourier coefficient φ5
130-135 F6.4 mag A6 Fourier coefficient A6
138-143 F6.4 rad phi6 Fourier coefficient φ6
146-151 F6.4 mag A7 Fourier coefficient A7
154-159 F6.4 rad phi7 Fourier coefficient φ7
162-167 F6.4 mag A8 Fourier coefficient A8
170-175 F6.4 rad phi8 Fourier coefficient φ8
178-183 F6.4 mag A9 Fourier coefficient A9
186-191 F6.4 rad phi9 Fourier coefficient φ9
194-199 F6.4 mag A10 Fourier coefficient A10
202-207 F6.4 rad phi10 Fourier coefficient φ10
209-214 F6.4 mag A11 Fourier coefficient A11
217-222 F6.4 rad phi11 Fourier coefficient φ11
225-230 F6.4 mag A12 Fourier coefficient A12
233-238 F6.4 rad phi12 Fourier coefficient φ12
241-246 F6.4 mag A13 Fourier coefficient A13
249-254 F6.4 rad phi13 Fourier coefficient φ13
257-262 F6.4 mag A14 Fourier coefficient A14
265-270 F6.4 rad phi14 Fourier coefficient φ14
273-278 F6.4 mag A15 Fourier coefficient A15
281-286 F6.4 rad phi15 Fourier coefficient φ15
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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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History:
* 30-Jan-1996: Original version
* 03-Sep-2013: the comment (asterisk) related to shifts was put
in a dedicated column n_Star
(End) Patricia Bauer [CDS]
30-Jan-1996