Search Publications
Differential Rotation of CoRoT Stars and a Kepler Binary Star from Starspot Transit Mapping
Valio, Adriana; Araújo, Alexandre; Menezes, Fabian
While direct magnetic field measurements are rare for slowly rotating stars, spots observed during planetary transits provide a potential indicator of magnetic activity on stellar surfaces. Moreover, the rotation of the stellar surface can be probed by monitoring the spots' position with time in subsequent transits. This study investigates the dyn…
Exploring the Helium Core of the δ Scuti Star CoRoT 102749568 with Asteroseismology
Li, Yan; Chen, Xinghao; Chen, Yanhui +2 more
Based on regularities in rotational splitting, we seek possible multiplets for the observed frequencies of CoRoT 102749568. There are 21 sets of multiplets identified, including four sets of multiplets with l = 1, nine sets of multiplets with l = 2, and eight sets of multiplets with l = 3. In particular, there are three complete triplets (f10…
The CoRoT Discovery of a Unique Triple-mode Cepheid in the Galaxy
Poretti, E.; Baglin, A.; Weiss, W. W.
The exploitation of the CoRoT treasure of stars observed in the exoplanetary field allowed the detection of a unusual triple-mode Cepheid in the Milky Way, CoRoT 0223989566. The two modes with the largest amplitudes and a period ratio of 0.80 are identified with the first (P 1 = 1.29 days) and second (P 2 = 1.03 days) radial …
The Future of the Sun: An Evolved Solar Twin Revealed by CoRoT
Porto de Mello, G. F.; Castro, M.; da Costa, J. S. +3 more
The question of whether the Sun is peculiar within the class of solar-type stars has been the subject of active investigation over the past three decades. Although several solar twins have been found with stellar parameters similar to those of the Sun (albeit in a range of Li abundances and with somewhat different compositions), their rotation per…
New Suns in the Cosmos?
Catelan, M.; Ferreira Lopes, C. E.; De Medeiros, J. R. +5 more
The present work reports on the discovery of three stars that we have identified to be rotating Sun-like stars, based on rotational modulation signatures inferred from light curves from the CoRoT mission's Public Archives. In our analysis, we performed an initial selection based on the rotation period and position in the period-T eff di…
Evidence for Granulation in Early A-Type Stars
Kallinger, Thomas; Matthews, Jaymie M.
Stars with spectral types earlier than about F0 on (or close) to the main sequence have long been believed to lack observable surface convection, although evolutionary models of A-type stars do predict very thin surface convective zones. We present evidence for granulation in two δ Scuti stars of spectral type A2: HD 174936 and HD 50844. Recent an…
Beaming Binaries: A New Observational Category of Photometric Binary Stars
Mazeh, Tsevi; Zucker, Shay; Alexander, Tal
The new photometric spaceborne survey missions COROT and Kepler will be able to detect minute flux variations in binary stars due to relativistic beaming caused by the line-of-sight motion of their components. In all but very short period binaries (P>10 days), these variations will dominate over the ellipsoidal and reflection periodic variabili…