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A new eclipsing binary system with a pulsating component detected by CoRoT
Ribas, I.; Balaguer-Núñez, L.; Hareter, M. +3 more
We report the discovery of CoRoT 102980178 (α = 06h 50m12.10s , δ = -02°41' 21.8'', J2000) an Algol-type eclipsing binary system with a pulsating component (oEA). It was identified using a publicly available 55 day long monochromatic lightcurve from the CoRoT initial run dataset (exoplanet field). Eleven consecutive 1.26m deep total primary and th…
Photometric and Spectroscopic Study of the Delta Scuti Stars FH Cam, CU CVn and CC Lyn
Ogloza, W.; Conidis, G. J.; Gazeas, K. D. +1 more
Three short period (P ∼ 1 day) variable stars from the Hipparcos catalogue targets were observed after suspected misclassification as Beta Lyr eclipsing systems (Perryman et al. 1997), as no secondary component had been noticed in the inspection of their Broadening Functions (BFs) (Rucinski 2002). FH Cam is found to be a multiple star system with …
Photometric observations and frequency analysis of the Delta Scuti star IP UMa
Gavras, P.; Sinachopoulos, D.; Ducourant, Chr.
IP UMa is a Delta Scuti star discovered by Hipparcos. 2642 observations of this target were acquired with the 20cm telescope of the Nea Lesbos Observatory in 10 nights from June 2 to July 9, 2009 using the Bessel V filter. These data confirmed the pulsation frequency of the star listed in the Hipparcos Catalogue (10 c/d).
Preliminary results on the pulsations of Be stars with CoRoT
Frémat, Y.; Neiner, C.; Janot-Pacheco, E. +13 more
We present preliminary results of the study of pulsations of Be stars from CoRoT observations. CoRoT detected many pulsation frequencies in all observed Be stars, usually interpreted in terms of g-modes but sometimes also corresponding to p-modes. Even in late Be stars, for which the detection of pulsation frequencies is very difficult from the gr…
Space observations of B stars with CoRoT
Auvergne, M.; Deleuil, M.; Jorda, L. +20 more
We present the preliminary results of the exploration of pulsating B stars observed with the CoRoT space mission. The previously known group of Slowly Pulsating B stars gains a substantial amount of new candidates, offering the opportunity to test stellar models beyond individual cases. Besides these well-defined stars, the analysis of other B sta…
Low-amplitude variations detected by CoRoT in the late type Be star HD 175869
Garrido, R.; Frémat, Y.; Neiner, C. +14 more
We present the analysis of the CoRoT data of the B8IIIe star HD 175869 observed during a short run (27.3 days). The light curve shows low-amplitude variations of the order of 0.3 mmag. A frequency within the range determined for the rotational frequency and its 5 harmonics are detected. Other significant frequencies with a low amplitude of a few p…
The true Blazhko behaviour of DM Cyg
Hurta, Zs.
We present preliminary results of our work on DM Cyg, an RRab star with steadily increasing pulsation period. The Blazhko modulation of the light curve of DM Cyg has not been undoubtedly confirmed yet. A reanalysis of the original data (Sódor & Jurcsik 2005) could not confirm the 26 d periodicity found by Lysova & Firmanyuk (1980) in the t…
First asteroseismic results from CoRoT
Auvergne, M.; Fridlund, M.; Ribas, I. +64 more
About one year after the end of the first observational run and six months after the first CoRoT data delivery, we comment the data exploitation progress for different types of stars. We consider first results to illustrate how these data of unprecedented quality shed a new light on the field of stellar seismology.
First results on the Be stars observed with the CoRoT satellite
Neiner, C.; Janot-Pacheco, E.; Floquet, M. +13 more
In this paper we present an overview of the analysis of some of the Be stars observed with the CoRoT satellite up to this date. Be stars are very fast-rotating B-type stars which may pulsate as β Cephei or SPB stars. CoRoT has already observed 5 bright Be stars in the seismology fields and several tens of fainter ones in the exoplanet fields with …
The pulsations of the B5IVe star HD181231 revealed by CoRoT
Neiner, C.; Janot-Pacheco, E.; Floquet, M. +12 more
We present the first results of the analysis of the light curve of the B5IVe star HD 181231 obtained during a long run (5 months) of the CoRoT mission. The light curve shows clear pulsations and even beating effects. Several frequencies are detected. Ground-based spec- troscopic data have also been analyzed and help to determine the rotation frequ…