2014A&A...570A.100S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:52:22

2014A&A...570A.100S - Astronomy and Astrophysics, volume 570A, 100-100 (2014/10-1)

Revisiting CoRoT RRLyrae stars: detection of period doubling and temporal variation of additional frequencies.

SZABO R., BENKO J.M., PAPARO M., CHAPELLIER E., PORETTI E., BAGLIN A., WEISS W.W., KOLENBERG K., GUGGENBERGER E. and LE BORGNE J.-F.

Abstract (from CDS):

High-precision, space-based photometric missions like CoRoT and Kepler have revealed new and surprising phenomena in classical variable stars. Such discoveries were the period doubling in RRLyrae stars and the frequent occurrence of additional periodicities some of which can be explained by radial overtone modes, but others are discordant with the radial eigenfrequency spectrum. We search for signs of period doubling in CoRoT RRLyrae stars. The occurrence of this dynamical effect in modulated RRLyrae stars might help us to gain more information about the mysterious Blazhko effect. The temporal variability of the additional frequencies in representatives of all subtypes of RRLyrae stars is also investigated. We preprocess CoRoT light curves by applying trend and jump correction and outlier removal. Standard Fourier technique is used to analyze the frequency content of our targets and follow the time-dependent phenomena. The most comprehensive collection of CoRoT RRLyrae stars, including new discoveries is presented and analyzed. We found alternating maxima and in some cases half-integer frequencies in four CoRoT Blazhko RRLyrae stars, as clear signs of the presence of period doubling. This reinforces that period doubling is an important ingredient for understanding the Blazhko effect - a premise we derived previously from the Kepler RRLyrae sample. As expected, period doubling is detectable only for short time intervals in most modulated RRab stars. Our results show that the temporal variability of the additional frequencies in all RRLyrae subtypes is ubiquitous. The ephemeral nature and the highly variable amplitude of these variations suggest a complex underlying dynamics of and an intricate interplay between radial and possibly nonradial modes in RRLyrae stars. The omnipresence of additional modes in all types of RRLyrae - except in non-modulated RRab stars - implies that asteroseismology of these objects should be feasible in the near future.

Abstract Copyright:

Journal keyword(s): stars: variables: RR Lyrae - stars: oscillations - stars: interiors - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/570/A100): stars.dat table3.dat>

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 - 2020
#notes
1 V* RV Tau Mi* 04 47 06.7238218181 +26 10 45.530144720   11.00 9.80     K0 265 0
2 UCAC2 31827126 dS* 06 45 29.2319212282 +00 23 05.002377261   14.9 14.098 13.77   K2V 7 0
3 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
4 V* AQ Leo RR* 11 23 55.2750743728 +10 18 59.080007685           A1 69 0
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
6 V* MW Lyr RR* 18 19 53.8178963804 +31 58 54.622000023           ~ 41 0
7 V* V610 Oph RR* 18 31 23.7813017173 +09 10 10.299022408           ~ 6 0
8 V* V922 Oph RR* 18 32 08.5337403017 +08 32 40.436434684           ~ 5 0
9 CoRoT 104315804 * 18 34 28.9105010870 +08 56 59.968410112           A5IV 2 0
10 2MASS J18380959+0743562 RR* 18 38 09.5958214866 +07 43 56.229540043           ~ 6 0
11 CoRoT 105288363 RR* 18 39 30.8644913900 +07 26 53.519296762   16.198 15.323 15.082   ~ 16 0
12 2MASS J18421012+0633049 RR* 18 42 10.1306952122 +06 33 04.907096138           B5II 4 0
13 V* V1127 Aql RV* 19 24 00.1006678790 +01 41 48.506796163     14.955     ~ 31 0
14 2MASS J19250542+0139236 El* 19 25 05.429 +01 39 23.64     16.161     ~ 7 0
15 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 880 0
16 CoRoT 101128793 RR* 19 26 37.3218997110 +01 13 34.777258598   15.6 15.928 14.8   ~ 17 0
17 CoRoT 101315488 dS* 19 27 47.4079132247 +00 58 35.487895252     16.152     ~ 4 0
18 2MASS J19281363+0040423 RR* 19 28 13.632 +00 40 42.34     15.864     ~ 9 0
19 CoRoT 101370131 RR* 19 28 14.4101983703 +00 06 02.232858781     15.601     ~ 9 0
20 CoRoT 101503544 V* 19 29 10.1274451825 +00 43 46.918134731   16.092 14.745 14.482   ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:52:22

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