J/ApJS/244/32 Extended Aperture Photometry of K2 RR Lyrae stars (Plachy+, 2019)
Extended Aperture Photometry of K2 RR Lyrae stars.
Plachy E., Molnar L., Bodi A., Skarka M., Szabo P., Szabo R., Klagyivik P.,
Sodor A., Pope B.J.S.
<Astrophys. J. Suppl. Ser., 244, 32 (2019)>
=2019ApJS..244...32P 2019ApJS..244...32P
ADC_Keywords: Stars, variable; Stars, population II; Photometry; Optical
Keywords: RR Lyrae variable stars; Light curves; Space telescopes
Abstract:
The Kepler Space Telescope observed thousands of RR Lyrae stars in the
K2 mission. In this paper, we present our photometric solutions using
extended apertures in order to conserve the flux of the stars to the
highest possible extent. With this method, we are able to avoid most
of the problems that RR Lyrae light curves produced by other pipelines
suffer from. For post-processing, we apply the K2SC pipeline to our
light curves. We provide the EAP (Extended Aperture Photometry) of 432
RR Lyrae stars observed in campaigns 3, 4, 5, and 6. We also provide
subclass classifications based on Fourier parameters. We investigated
in particular the presence of the Blazhko effect in the stars and
found it to be 44.7% among the RRab stars, in agreement with results
from independent samples. We found that the amplitude and phase
modulation in the Blazhko stars may behave rather differently, at
least over the length of a K2 Campaign. We also identified four
anomalous Cepheid candidates in the sample, one of which is
potentially the first Blazhko-modulated member of its class.
Description:
The RR Lyrae candidates were chosen from Kepler K2 mission campaigns
3 to 6 from Guest Observer proposals GO3040, GO4069, GO5069, and
GO6082. These campaigns do not suffer from instrumental issues
characterizing the early campaigns and the off-nominal pointing at the
beginning and the mid-campaign breaks.
See section 3 for a description of the EAP (Extended Aperture
Photometry) method.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 74 432 RR Lyrae stars processed with the Extended
Aperture Photometry (EAP) method
table3.dat 51 25 Non RR Lyrae stars in the sample
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See also:
V/133 : Kepler Input Catalog (Kepler, 2009)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
J/ApJ/598/597 : Frequency analysis of fundamental-mode RRL (Alcock+, 2003)
J/A+A/430/1049 : RR Gem BV(RI)c differential photometry (Jurcsik+, 2005)
J/MNRAS/391/164 : MW Lyr BV(RI)c light curves (Jurcsik+, 2008)
J/MNRAS/415/1577 : CoRoT 105288363 Blazhko modulation (Guggenberger+, 2011)
J/AcA/61/1 : VI LCs of Galactic Bulge RR Lyrae (Soszynski+, 2011)
J/ApJS/213/31 : Blazhko effect from 4yr of Kepler data (Benko+, 2014)
J/AcA/64/177 : VI LCs of Galactic Bulge RR Lyrae (Soszynski+, 2014)
J/A+A/579/A19 : K2 Variable Catalogue (Armstrong+, 2015)
J/MNRAS/452/4283 : 33 RR Lyrae observed in Pisces with K2-E2 (Molnar+, 2015)
J/AcA/65/233 : OGLE Magellanic Clouds anomalous Cepheids (Soszynski+, 2015)
J/MNRAS/456/2260 : K2 Variability Catalogue II (Armstrong+, 2016)
J/A+A/594/A100 : K2 new planetary and EB candidates (Barros+, 2016)
J/MNRAS/466/2602 : Blazhko effect in Galactic RR Lyrae (Prudil+, 2017)
J/AcA/67/297 : OGLE Gal. center Cepheids and RR Lyrae (Soszynski+, 2017)
J/A+A/620/A127 : Cassification of RR Lyrae and Cepheid (Molnar+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- EPIC [205905693/229228121] K2 EPIC identifier
11- 20 F10.6 deg RAdeg [52.3/343.8] Right Ascension (J2000)
22- 31 F10.6 deg DEdeg [-18.1/24.5] Declination (J2000)
33- 38 F6.3 mag Kpmag [11.2/21.3] Kepler magnitude
40- 41 A2 --- Cam K2 campaign
43- 54 A12 --- Type RR Lyrae subtype
56- 64 F9.6 d Per-FM [0.45/0.9]?=-1 Fundamental period
66- 74 F9.6 d Per-O1 [0.25/0.5]?=-1 1st overtone period
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- EPIC [206090129/229228122] K2 EPIC identifier
11- 20 F10.6 deg RAdeg [53.5/338.8] Right Ascension (J2000)
22- 31 F10.6 deg DEdeg [-17.3/24.6] Declination, decimal degrees (J2000)
33- 38 F6.3 mag Kpmag [9.6/20.1] Kepler magnitude
40- 41 A2 --- Cam K2 campaign
43- 51 A9 --- OT Non-RR Lyrae type ("EB", "ROT", "ROT/W Vir" or "?")
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Mar-2020