J/ApJ/809/L19 LCs of the RR Lyrae stars V350 Lyr & KIC 7021124 (Henry+, 2015)
The Blazhko effect and additional excited modes in RR Lyrae stars.
Benko J.M., Szabo R.
<Astrophys. J., 809, L19 (2015)>
=2015ApJ...809L..19B 2015ApJ...809L..19B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry
Keywords: space vehicles - stars: oscillations - stars: variables: RR Lyrae -
techniques: photometric
Abstract:
Recent photometric space missions, such as CoRoT and Kepler, revealed
that many RR Lyrae stars pulsate --beyond their main radial pulsation
mode-- in low-amplitude modes. Space data seem to indicate a clear
trend that, namely, overtone (RRc) stars and modulated fundamental
(RRab) RR Lyrae stars ubiquitously show additional modes, while
non-Blazhko RRab stars never do. Two Kepler stars (V350Lyr and
KIC7021124), however, apparently seemed to break this rule: they were
classified as non-Blazhko RRab stars showing additional modes. We
processed Kepler pixel photometric data of these stars. We detected a
small amplitude (but significant) Blazhko effect for both stars by
using the resulting light curves and O-C diagrams. This finding
strengthens the apparent connection between the Blazhko effect and the
excitation of additional modes. In addition, it yields a potential
tool for detecting Blazhko stars through the additional frequency
patterns, even if we have only short but accurate time series
observations. V350 Lyr shows the smallest amplitude multiperiodic
Blazhko effect ever detected.
Description:
The Kepler photometry of the non-Blazhko RR Lyrae stars was studied
first by Nemec et al. (2011MNRAS.417.1022N 2011MNRAS.417.1022N) on the basis of the
commissioning phase and the first five quarters (Q0-Q5). Furthermore,
Nemec et al. (2013ApJ...773..181N 2013ApJ...773..181N), along with the ground-based
spectroscopic observations, also published new results from the Kepler
photometry of quarters Q0-Q11. The present Letter uses the complete
(Q0-Q17) long-cadence (LC) Kepler observations.
Objects:
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RA (ICRS) DE Designation(s)
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18 49 08.37 +46 11 55.0 V350 Lyr = KIC 9508655
19 10 26.77 +42 33 37.5 KIC 7021124 = 2MASS J19102676+4233375
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 67 61912 Rectified data file of V350 Lyr
table2.dat 67 61630 Rectified data file of KIC 7021124
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
J/ApJS/219/25 : LCs of RR Lyrae stars in M3 (NGC5272) (Jurcsik+, 2015)
J/A+A/570/A100 : BVRc light curves of 5 CoRoT RR Lyrae stars (Szabo+, 2014)
J/A+A/562/A90 : Times of maximum light of Blazhko RRab stars (Skarka, 2014)
J/ApJS/213/31 : Blazhko effect from 4yr of Kepler data (Benko+, 2014)
J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)
J/AJ/144/24 : The Kepler-INT survey (Greiss+, 2012)
J/A+A/529/A89 : Kepler satellite variability study (Debosscher+, 2011)
J/AcA/61/1 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2011)
J/A+A/510/A39 : CoRoT light curves of V1127 Aql (Chadid+, 2010)
http://archive.stsci.edu/kepler/ : MAST Kepler home page
http://www.konkoly.hu/KIK/data.html : Kepler & K2 RR Lyrae light curves
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 5 I4 --- Seq [1/4573] Serial number
7- 16 F10.5 d BJD [131.5/1591.1] Barycentric Julian Date;
BJD-2454833.0
18- 24 F7.1 ct/s SFlux [2786/25797] Flux summed up in a tailor-made
aperture; e-/s
26- 34 F9.2 ct/s ZPO Zero point offset; e-/s
36- 40 F5.3 --- Scl [0.88/1.08] Scaling factor; 1.0 = no scaling
42- 55 F14.8 ct/s CFlux [4363/19538] Shifted, scaled & detrended flux;
e-/s
57- 67 F11.8 mag Kpmag [-0.7/0.5] The CFlux value in Kepler magnitude
scale
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-Dec-2015