J/AJ/169/58 Light curves & y-band magnitudes of RR Lyrae from LOT (Ngeow+, 2025)
Adding RR Lyrae y-band template light curves to gatspy.
Ngeow C.-C., Cheng C.-Y.
<Astron. J., 169, 58 (2025)>
=2025AJ....169...58N 2025AJ....169...58N
ADC_Keywords: Photometry, infrared; Stars, variable
Keywords: RR Lyrae variable stars ; Light curves
Abstract:
We complement the y-band template light curves for RR Lyrae to the
well-established template light curves in the ugriz-band, where the
latter have been adopted in the astroML/gatspy python package as one
of the period-search methods for RR Lyrae. These y-band template light
curves were constructed based on the z-band time series data taken
from the Sloan Digital Sky Survey (SDSS), the y-band light curves from
the Pan-STARRS1 survey, and dedicated y-band observations using the
Lulin One-meter Telescope for RR Lyrae located in the SDSS Stripe 82
region. These y-band template light curves, 9 for the ab-type RR Lyrae
and 3 for the c-type RR Lyrae, can be applied in conjunction to the
ugriz-band template light curves for upcoming sky surveys involving
the y-band, such as the Vera C. Rubin Observatory Legacy Survey of
Space and Time.
Description:
Based on repeated observations of 483 RR Lyrae located in the Sloan
Digital Sky Survey (SDSS) Stripe 82 region, Sesar+2010 (J/ApJ/708/717)
derived the RR Lyrae template light curves in the ugriz filters. The
goal of this work is to construct a set of y-band (950-1058nm) template
light curves using the same sample of RR Lyrae located in the SDSS
Stripe 82 region. From this sample of RR Lyrae, we first removed those
identified as double-mode RR Lyrae (RRd; Varma+, 2024AJ....168...43V 2024AJ....168...43V) or
exhibit Blazhko modulations in RRab and RRc (Varma+, 2024AJ....167...14V 2024AJ....167...14V),
which left 361 RR Lyrae in our sample.
The Lulin One-meter Telescope (LOT) is a F/8 Cassegrain telescope
located at the Lulin Observatory in central Taiwan. We only selected
RR Lyrae with mean y-band magnitudes brighter than ∼18mag. Depending
of the brightness for the targeted RR Lyrae, exposure time varies
between 120, 240, 360, and 480s. In total, the LOT queue observations
were carried out in 46 full or partial nights from 2022 July to 2023
December (when SDSS Stripe 82 region was visible from the Lulin
Observatory).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 7 130 List of RR Lyrae (Table added by CDS)
table1.dat 33 659 LOT light curves for selected RR Lyrae
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See also:
I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)
J/AJ/130/1640 : Photometry of candidate RR Lyrae stars in the SDSS (Wu+, 2005)
J/MNRAS/371/1503 : Synthetic photometry of RR Lyr (Marconi+, 2006)
J/MNRAS/391/164 : MW Lyr BV(RI)c light curves (Jurcsik+, 2008)
J/MNRAS/398/1757 : RR Lyraes in SDSS stripe 82 (Watkins+, 2009)
J/ApJS/186/233 : Variable point sources in SDSS stripe 82. I. (Bhatti+, 2010)
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/MNRAS/424/2528 : RR Lyrae in SDSS Stripe 82 (Suveges+, 2012)
J/MNRAS/441/715 : Mid-infrared study of RR Lyrae stars (Gavrilchenko+, 2014)
J/AcA/64/177 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2014)
J/AcA/66/131 : VI light curves of SMC and LMC RR Lyrae (Soszynski+, 2016)
J/ApJ/834/160 : ugriz colors of RR Lyrae stars in SDSS Stripe 82 (Ngeow+, 2017)
J/A+A/625/A1 : RR Lyrae variables NIR light-curve templates (Braga+, 2019)
J/ApJS/246/8 : RR Lyrae star candidates from SDSS-DR15 (Zhang+, 2020)
J/MNRAS/491/4752 : Modelled parameters of Cepheid & RR Lyrae (Bellinger+, 2020)
J/AJ/164/45 : grV light curve for 30 RR-Lyrae in the Kepler field (Ngeow, 2022)
J/A+A/689/A138 : Light curves of RR Lyrae in the Sloan bands (Narloch+, 2024)
J/A+A/689/A189 : RR Lyrae periods with PS1 and K2 (Forro+, 2024)
J/A+A/689/A349 : Light curve templates in LSST photometric syst. (Braga+, 2024)
J/A+A/694/A72 : Multi-band templates of RR Lyrae stars (Baeza-Villagra+, 2025)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [4099/4954954] SDSS Stripe 82 RR Lyrae ID
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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- 7 I7 --- ID [4099/4954954] SDSS Stripe 82 RR Lyrae ID
9- 20 F12.6 d MJD [59783/60305] Modified Julian Date
(JD-2,400,000.5)
22- 27 F6.3 mag ymag [13.4/18.7] y-band (950-1058nm) magnitude
29- 33 F5.3 mag e_ymag [0.01/0.3] Error on ymag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Robin Leichtnam [CDS] 18-Nov-2025