J/AJ/164/45 grV light curve for 30 RR-Lyrae in the Kepler field (Ngeow, 2022)
Evaluating the V-band Photometric Metallicity with Fundamental Mode RR Lyrae in
the Kepler Field.
Ngeow C.-C.
<Astron. J., 164, 45 (2022)>
=2022AJ....164...45N 2022AJ....164...45N
ADC_Keywords: Stars, variable; Photometry, G band; Photometry, VRI
Keywords: RR Lyrae variable stars ; Metallicity ; Light curves
Abstract:
The aim of this work is to evaluate the performance of photometric
metallicity [Fe/H], determined based on V-band light curves
photometrically transformed from the gr-band light curves. We tested
this by using a set of homogeneous samples of fundamental mode
RR-Lyrae located in the Kepler field. It was found that the color term
is necessary in such photometric transformation. We demonstrated that
when including the color term the determined photometric [Fe/H] are in
good agreement with the spectroscopic [Fe/H], either based on the
calibrated or the transformed V-band light curves. We also tested the
impact of Blazhko RR-Lyrae in determining the photometric [Fe/H], and
found that Blazhko RR-Lyrae can give consistent photometric [Fe/H].
Finally, we derived independent gVr-band [Fe/H]-ph31-P relations
(where ph31 and P are the Fourier parameter and pulsation period,
respectively) using our light curves. The V-band relation is in good
agreement with the most recent determination given in the literature.
Description:
Time-series observations of the 30 targeted RR-Lyrae in the Kepler
field were carried out using the 0.41m SLT telescope located at Lulin
Observatory. This telescope is an f/8.4 Ritchey-Chretien telescope and
is equipped with an Andor iKon-L936 CCD camera, providing a pixel
scale of 0.79"/pixel. Queue observations were executed, via commercial
software MaxIm DL and ACP Observatory Control Software, from 2019 June
18 to 2021 November 24 (weather permitting) in gVr filters. Depending
on the brightness of the targeted RR Lyrae, exposure time varied
between 2 to 300s in all filters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
targets.dat 19 30 Targets for this work
table1.dat 104 4012 grV-band calibrated light-curves for 30 ab-type
RR Lyrae in the Kepler Field
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+AS/105/145 : RR Lyr stars of ome Cen (Petersen 1994)
J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
J/MNRAS/398/1757 : RR Lyraes in SDSS stripe 82 (Watkins+, 2009)
J/ApJ/708/717 : Light curve templates of RR Lyrae stars (Sesar+, 2010)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/ApJ/908/20 : Use of field RRLyrae as galactic probes. II. (Crestani+, 2021)
Byte-by-byte Description of file: targets.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC identifier
10- 19 F10.8 d Per [0.43/0.69] Period
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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 I8 --- KIC KIC identifier
10- 27 F18.10 d HJDg [2458653/2459544] Heliocentric Julian Date of
g-band observation
29- 34 F6.3 mag gmag [7.16/17.8] Apparent g-band magnitude
36- 40 F5.3 mag e_gmag [0.005/0.3] Uncertainty in gmag
42- 59 F18.10 d HJDr [2458653/2459544] Heliocentric Julian Date of
r-band observation
61- 66 F6.3 mag rmag [7.24/17.5] Apparent r-band magnitude
68- 72 F5.3 mag e_rmag [0.005/0.4] Uncertainty in rmag
74- 91 F18.10 d HJDv [2458653/2459544] Heliocentric Julian Date of
V-band observation
93- 98 F6.3 mag Vmag [7.23/17.8] Apparent V-band magnitude
100-104 F5.3 mag e_Vmag [0.009/0.3] Uncertainty in Vmag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Oct-2022