2007A&A...462.1007K


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST02:13:36

2007A&A...462.1007K - Astronomy and Astrophysics, volume 462, 1007-1016 (2007/2-2)

Computation of the Fourier parameters of RR Lyrae stars by template fitting.

KOVACS G. and KUPI G.

Abstract (from CDS):

Due to the importance of accurate Fourier parameters, we devise a method that is more appropriate for deriving these parameters for low-quality data than the traditional Fourier fitting. Based on the accurate light curves of 248 fundamental mode RR Lyrae stars, we test the power of a full-fetched implementation of the template method in the computation of the Fourier decomposition. The applicability of the method is also demonstrated on data sets of filter passbands different from those of the template set.We examine in more detail the question of the estimation of Fourier-based iron abundance [Fe/H] and average brightness. We get, for example, for light curves sampled randomly in 30 data points with σ=0.03mag observational noise, that optimized direct Fourier fits yield σ([Fe/H])=0.33, whereas the template fits result in σ([Fe/H])=0.18. Tests made on the RR Lyrae database of the Large Magellanic Cloud of the Optical Gravitational Lensing Experiment support the applicability of the method on real photometric time series. These tests also show that the dominant part of error in estimating the average brightness comes from other sources, most probably from crowding effects, even for under-sampled light curves.

Abstract Copyright:

Journal keyword(s): methods: data analysis - stars: variables: RR Lyr - stars: fundamental parameters

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1062 4
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
3 Cl* NGC 1841 KSH V4 * 04 44 10 -83 58.9   19.16       ~ 3 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6   8.80 7.23     ~ 1206 0
5 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 251 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14324 1
7 V* IV Hya RR* 09 22 20.6021885523 -13 38 48.964426094     13.45   12.50 ~ 23 0
8 V* RR Leo RR* 10 07 43.4604770180 +23 59 30.322184269 10.14 10.01 9.94     F0 164 0
9 NGC 4499 GiG 12 32 04.944 -39 58 56.83   13.58   12.20   ~ 31 0
10 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2908 0
11 Cl* NGC 5139 SAW V176 V* 13 27 01.123 -47 29 47.43           ~ 4 0
12 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2223 0
13 Cl* NGC 6171 DICK V12 RR* 16 32 35.98 -13 02 16.6   16.306 15.669     ~ 13 0
14 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 459 0
15 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 739 0
16 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 874 0
17 V* FH Vul RR* 20 40 19.8863263981 +22 13 24.291008291           ~ 24 0
18 V* DX Del RR* 20 47 28.3556417515 +12 27 50.682381539 9.97 9.79 9.52     A7IIIv 156 0
19 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 352 0
20 V* SW Aqr RR* 21 15 17.8507697697 +00 04 34.870552843   11.56 11.51     A3 97 0

    Equat.    Gal    SGal    Ecl

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2019.10.18-02:13:36

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