First CoRoT light curves of RR Lyrae stars

Chadid, M.; Benkő, J. M.; Szabo, Robert M.; Paparó, M.; Chapellier, E.; Kolenberg, K.; Poretti, E.; Bono, G.; Borgne, J. F. Le; Trinquet, H.; Artemenko, S. A.; Auvergne, M.; Baglin, A.; Debosscher, J.; Grankin, K. N.; Guggenberger, E.; Weiß, W. W.

doi:10.1051/0004-6361/200913345

Cited by 77 publications

(108 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14 in Chadid et al 2010). The Blazhko effect of CoRoT 101128793 is much less than that of V1127 Aql (0.06 mag vs. 0.35 mag in the full range of magnitudes at maximum, 0.02 p vs. 0.17 p in the phases of maximum).…”

Section: The Blazhko Effectmentioning

confidence: 87%

“…The two frequencies f 1 and f 2 are not related with the Blazhko or another modulation, as it could be for V1127 Aql (Chadid et al 2010). The frequency f 1 could be typified as the second overtone radial mode, while the nature of f 2 is still unclear.…”

Section: The Excitation Of Additional Modesmentioning

confidence: 94%

“…RR Lyrae stars are being studied in the framework of the international RR Lyrae-CoRoTeam 1 . Preliminary results were presented by Chadid et al (2009), and the potential of the 150-day continuous monitoring of an RR Lyrae star has been demonstrated by the case of V1127 Aql (Chadid et al 2010), not previously known as a Blazhko variable. Very high-order modulation sidepeaks were detected, up to the sepdecaplet structure.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

CoRoT light curves of RR Lyrae stars

Poretti¹,

Paparó

Deleuil

et al. 2010

A&A

Self Cite

View full text Add to dashboard Cite

Context. The CoRoT (Convection, Rotation and planetary Transits) space mission provides a valuable opportunity to monitor stars with uninterrupted time sampling for up to 150 days at a time. The study of RR Lyrae stars, performed in the framework of the Additional Programmes belonging to the exoplanetary field, will particularly benefit from such dense, long-duration monitoring. Aims. The Blazhko effect in RR Lyrae stars is a long-standing, unsolved problem of stellar astrophysics. We used the CoRoT data of the new RR Lyrae variable CoRoT 101128793 ( f 0 = 2.119 d −1 , P = 0.4719296 d) to provide us with more detailed observational facts to understand the physical process behind the phenomenon. Methods. The CoRoT data were corrected for one jump and the long-term drift. We applied different period-finding techniques to the corrected timeseries to investigate amplitude and phase modulation. We detected 79 frequencies in the light curve of CoRoT 101128793. They have been identified as the main frequency f 0 and its harmonics, two independent terms, the terms related to the Blazhko frequency f m , and to several combination terms. Results. A Blazhko frequency f m = 0.056 d −1 and a triplet structure around the fundamental radial mode and harmonics were detected, as were a long-term variability on the Blazhko modulation. Indeed, the amplitude of the main oscillation is decreasing along the CoRoT survey. The Blazhko modulation is one of the smallest observed in RR Lyrae stars. Moreover, the additional modes f 1 = 3.630 and f 2 = 3.159 d −1 are detected. Taking its ratio with the fundamental radial mode into account, the term f 1 could be the identified as the second radial overtone. Detecting of these modes in horizontal branch stars is a new result obtained by CoRoT.

show abstract

Section: The Blazhko Effectmentioning

confidence: 87%

Section: The Excitation Of Additional Modesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

CoRoT light curves of RR Lyrae stars

Poretti¹,

Paparó

Deleuil

et al. 2010

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…They did not detect additional frequencies in the BS Com Fourier spectrum. The nature of the additional frequencies in RR d stars, as well as in Blazhko stars (Chadid et al 2010), needs further investigation. The continuous and unprecedented CoRoT photometric data provide a unique opportunity to obtain an RR d light curve over relatively long time period (150 days) and with a relatively high precision.…”

Section: Introductionmentioning

confidence: 99%

Detection of multiple modes in a new double-mode RR Lyrae star

Chadid¹

2012

A&A

Self Cite

View full text Add to dashboard Cite

Context. We present the first long-time coverage of high precision and uninterrupted light curve of a new double-mode RR Lyrae star allowing the determination of accurate Fourier components and the estimatation of fundamental parameters. Aims. We used high-precision space data of a new star CoRoT ID 0101368812, obtained by the satellite CoRoT, towards an understanding of double-mode RR Lyrae stars and the stellar evolution & pulsation.Methods. The CoRoT data were corrected using jump and trend filtering codes and we applied the period-finding technique Period04. Results. Non-linearly coupled frequencies f 0 = 2.049 d −1 (P 0 = 0.488 d) and f 1 = 2.750 d −1 (P 1 = 0.364 d) are found up to the tenth order with a period ratio P 1 /P 0 of 0.745 and an amplitude ratio A 1 /A 0 of 2.705. The frequencies f 0 and f 1 are interpreted as radial modes. The first overtone is the dominant pulsation mode. A large number of 22 linear combinations of these modes are also detected. An unprecedented number of additional frequencies and their linear combinations, are detected in addition to the fundamental radial mode, the first overtone radial mode, and their linear combinations. The most surprising result is the unexpected period ratios 0.458, 0.285, and 0.217 of additional frequencies to fundamental radial mode, which imply a possible simultaneous excitation of fundamental, first, and third overtone radial modes, in addition to non-radial modes. Conclusions. The newly discovered CoRoT ID 0101368812 is the first member of a new class of RR Lyrae stars. These results give us an opportunity to test the theoretical models of mode saturation and growth in RR d pulsators.

show abstract

“…The Stothers theory does not require any non-radial mode, however there has been no unambiguous proof of the nonradial mode presence in RR Lyrae stars so far. Nonradial modes have been identified by Chadid et al (1999) using spectroscopic data of RR Lyr itself, by Gruberbauer et al (2007) using photometric data collected with the MOST satellite of mixed mode pulsator AQ Leo and by Chadid et al (2010) using time series data collected with CoRot of the fundamental RR Lyrae V1127 Aql.…”

Section: Introductionmentioning

confidence: 99%

First Antarctica light curve

Chadid

Vernin²,

Mékarnia³

et al. 2010

A&A

Self Cite

View full text Add to dashboard Cite

Context. In the context of long and continuous time-series photometry and after the MOST, CoRoT, KEPLER space missions and large geographic longitude ground-based networks, a new method is offered by the polar location helping to cope with the problem associated with the Earth's day-night cycle. Aims. We present the first long time -series photometry from Dome Charlie in the heart of Antarctica and analyze ∼4400 photometric measurements of RR Lyrae star S Arae obtained in July and August 2007. Methods. The 40-cm telescope and Photometer AntarctIca eXtinction named PAIX were used for long photometric measurements with high time resolution and a duty cycle of 65%. The Fourier technique was used for the frequency analysis. New high-precision spectroscopic observations of S Arae were also collected using HARPS over one pulsation cycle of S Arae. Results. We confirm the known radial fundamental period of 0.452 day. The high order of its harmonics shows the nonlinear nature of the radial mode. The Blazhko modulation is directly detected in the spectrum and shows a value around 48 d. Together with the Blazhko frequency we also detected triplet structure components up to 15th order showing a nonlinear behavior of the Blazhko modulation. Thus, we conclude that S Arae is a bona fide Blazhko star. The data reveal that there are irregular changes in the S Arae atmosphere during the Blazhko cycle. A residual scatter phenomenon is detected and is more intense where the nonlinear effects are strongest. Therefore, the connection between temporal hydrodynamic phenomena and such modulation has to be taken into account in Blazhko models. Conclusions. High-precision CCD photometry with a very good time resolution can be undertaken at Dome Charlie in Antarctica, and it helps to complete astrophysical measurement time-series.

show abstract

First CoRoT light curves of RR Lyrae stars

Cited by 77 publications

References 44 publications

CoRoT light curves of RR Lyrae stars

CoRoT light curves of RR Lyrae stars

Detection of multiple modes in a new double-mode RR Lyrae star

First Antarctica light curve

Contact Info

Product

Resources

About