Regular frequency patterns in the young δ Scuti star HD 261711 observed by the CoRoT and MOST satellites

  title={Regular frequency patterns in the young $\delta$ Scuti star HD 261711 observed by the CoRoT and MOST satellites},
  author={Konstanze Zwintz and Luca Fossati and David B. Guenther and T. Ryabchikova and Annie Baglin and Nathalie Themessl and Thomas G. Barnes and Jaymie Matthews and Michel Auvergne and David Bohlender and S. Chaintreuil and Rainer Kuschnig and Anthony F. J. Moffat and Jason F. Rowe and Slavek M. Rucinski and Dimitar D. Sasselov and Werner W. Weiss},
  journal={Astronomy and Astrophysics},
Context. The internal structure of pre-main-sequence (PMS) stars is poorly constrained at present. This could change significantly through high-quality asteroseismological observations of a sample of such stars. Aims. We concentrate on an asteroseismological study of HD 261711, a rather hot δ Scuti-type pulsating member of the young open cluster NGC 2264 located at the blue border of the instability region. HD 261711 was discovered to be a PMS δ Scuti star using the time series photometry… Expand
Searching for δ Scuti-type pulsation and characterising northern pre-main-sequence field stars
Context. Pre-main-sequence stars (PMS) are objects evolving from the birthline to the zero-age main sequence (ZAMS). Given a mass range near the ZAMS, the temperatures and luminosities ofExpand
Evidence of chaotic modes in the analysis of four δ Scuti stars
Context. Since CoRoT observations unveiled the very low amplitude modes that form a flat plateau in the power spectrum structure of δ Scuti stars, the nature of this phenomenon, including theExpand
Two spotted and magnetic early B-type stars in the young open cluster NGC 2264 discovered by MOST and ESPaDOnS
Star clusters are known as superb tools for understanding stellar evolution. In a quest for understanding the physical o rigin of magnetism and chemical peculiarity in about 7% of the massiveExpand
A probable pre-main sequence chemically peculiar star in the open cluster Stock 16
We used the Ultraviolet and Visual Echelle Spectrograph of the ESO-Very Large Telescope to obtain a high resolution and high signal-to-noise ratio spectrum of Stock 16-12, an early-type star whichExpand
Very regular high-frequency pulsation modes in young intermediate-mass stars
The detection of remarkably regular sequences of high-frequency pulsation modes in 60 intermediate-mass main-sequence stars, which enables definitive mode identification and indicates that some of these stars are members of known associations of young stars, as confirmed by modelling of their pulsation spectra. Expand
A BRITE view on δ Scuti and γ Doradus stars
δ Scuti stars have spectral types A to early F, masses between ∼1.5 and 4.0 solar masses and pulsation periods between 18 minutes and 6 hours. They typically show multiple radial and non-radialExpand
Stable and unstable accretion in the classical T Tauri stars IM Lup and RU Lup as observed by MOST
Results of the time variability monitoring of the two classical T Tauri stars, RU Lup and IM Lup, are presented. Three photometric data sets were utilised: (1) simultaneous (same field) MOSTExpand
Forward asteroseismic modeling of stars with a convective core from gravity-mode oscillations: parameter estimation and stellar model selection.
We propose a methodological framework to perform forward asteroseismic modeling of stars with a convective core, based on gravity-mode oscillations. These probe the near-core region in the deepExpand
Echography of young stars reveals their evolution
It is demonstrated that a seismic analysis of stars in their earliest evolutionary phases is a powerful method with which to identify young stars and distinguish their evolutionary states, illustrating the potential of asteroseismology for the early evolutionary phases. Expand
Evidence of amplitude modulation due to resonant mode coupling in the δ Scuti star KIC 5892969 A particular or a general case
A study of the star KIC 5892969 observed by the Kepler satellite is presented. Its three highest amplitude modes present a strong amplitude modulation. The aim of this work is to investigateExpand


Regular Frequency Patterns In The Classical Delta Scuti Star HD 144277 Observed By The MOST Satellite
Context. We present high-precision time-series photometry of the classical δ Scuti star HD 144277 obtained with the MOST (Microvariability and Oscillations of STars) satellite in two consecutiveExpand
MOST observations of the young open cluster NGC 2264
Context. Photometric time series obtained from space are one of the best ways to study pulsations in pre-main sequence (PMS) stars, especially as the corresponding amplitudes are at theExpand
NGC 2264 is a young open cluster lying above the Galactic plane in which six variable stars have previously been identified as possible pre-main-sequence (PMS) pulsators. Their oscillation spectraExpand
gamma Doradus pulsation in two pre-main sequence stars discovered by CoRoT
Pulsations in pre-main sequence stars have been discovered several times within the last years. But nearly all of these pulsators are of delta Scuti-type. gamma Doradus-type pulsation in young starsExpand
A multisite photometric campaign on the pre-main-sequence delta Scuti pulsator IP Persei
We present the results of a photometric multisite campaign on the 6 Scuti Pre-Main-Sequence star IP Per. Nine telescopes have been involved in the observations, with a total of about 190 h ofExpand
Regularities in frequency spacings of δ Scuti stars: the Kepler star KIC 9700322
In the faint star KIC 9700322 observed by the Kepler satellite, 76 frequencies with amplitudes from 14 to 29000 ppm were detected. The two dominant frequencies at 9.79 and 12.57 c/d (113.3 and 145.5Expand
Regularities in the frequency spacings of Delta Scuti stars and the s-f Diagram
Statistical analyses of several Delta Scuti stars (FG Vir, 44 Tau, BL Cam and others) show that the photometrically observed frequencies cluster around the frequencies of the radial modes over manyExpand
MOST observations of the Herbig Ae δ-Scuti star HD 34282
ABSTRACT MOSTobservations and model analysis of the Herbig Ae star HD 34282 (V1366 Ori)reveal δScuti pulsations. 22 frequencies are observed, 10 of which confirm those pre-viously identified by AmadoExpand
Late stages of the evolution of A-type stars on the main sequence: comparison between observed chemical abundances and diffusion models for 8 Am stars of the Praesepe cluster
Aims. We aim to provide observational constraints on diffusion models that predict peculiar chemical abundances in the atmospheres of Am stars. We also intend to check if chemical peculiarities andExpand
Towards mode selection in δ Scuti stars: regularities in observed and theoretical frequency spectra
ABSTRACT Only a fractionof the theoreticallypredicted nonradialpulsation modes haveso farbeen observed in δ Scuti stars. Nevertheless, the large number of frequencies detectedin recent photometricExpand