Publications (14)
Li abundances for solar twins in the open cluster M67
Marilia Carlos, Jorge Melendez, Jose-Dias do Nascimento +1
We determine lithium (Li) abundances for solar twins in the M67 open cluster to add valuable information about the correlation between Li depletion and stellar age and, then, bette…
The PLATO Mission
Heike Rauer, Conny Aerts, Juan Cabrera +842
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large numb…
HIP 10725: The First Solar Twin/Analogue Field Blue Straggler
Lucas Schirbel, Jorge Melendez, Amanda I. Karakas +9
[Context]. Blue stragglers are easy to identify in globular clusters, but are much harder to identify in the field. Here we present the serendipitous discovery of one field blue st…
Lithium abundance evolution in open clusters: Hyades, NGC752, and M67
Matthieu Castro, Giancarlo Pace, José Dias do Nascimento
Mixing mechanisms bring the Li from the base of the convective zone to deeper and warmer layers where it is destroyed. These mechanisms are investigated by comparing observations o…
Orbital period variation of KIC 10544976: Applegate mechanism versus light travel time effect
Leonardo A. Almeida, Leandro de Almeida, Augusto Damineli +6
In recent years, several close post-common-envelope eclipsing binaries have been found to show cyclic eclipse timing variations (ETVs). This effect is usually interpreted either as…
Rotation of solar analogs cross-matching Kepler and Gaia DR2
Jose-Dias do Nascimento, Leandro de Almeida, Eduardo Nunes Velloso +10
A major obstacle to interpreting the rotation period distribution for main-sequence stars from Kepler mission data has been the lack of precise evolutionary status for these object…
Theoretical evolution of Rossby number for solar analog stars
Matthieu Castro, TharcÃsyo Duarte, José Dias do Nascimento
Magnetic fields of late-type stars are presumably generated by a dynamo mechanism at the interface layer between the radiative interior and the outer convective zone. The Rossby nu…
Optimized cutting off transit algorithm to study stellar rotation from PLATO mission light curves
Leandro de Almeida, Francys Anthony, Ana Carolina Mattiuci +4
Measuring the stellar rotation of one of the components in eclipsing binaries (EBs) or planetary systems is a challenging task. The difficulty is mainly due to the complexity of an…
Asteroseismology of exoplanets-host stars: a link between the two scientific programmes of COROT
Sylvie Vauclair, Matthieu Castro, Stephane Charpinet +5
Studying the internal structure of exoplanets-host stars compared to that of similar stars without detected planets is particularly important for the understanding of planetary for…
Lithium in M67: From the main sequence to the red giant branch
Giancarlo Pace, Matthieu Castro, Jorge Melendez +2
Lithium abundances in open clusters are a very effective probe of mixing processes, and their study can help to understand the large depletion of lithium in the Sun. Due to its age…
Mass effect on the lithium abundance evolution of open clusters: Hyades, NGC 752, and M67
Matthieu Castro, TharcÃsyo Duarte, Giancarlo Pace +1
Lithium abundances in open clusters provide an effective way of probing mixing processes in the interior of solar-type stars and convection is not the only mixing mechanism at work…
Is the primary CoRoT target HD43587 under a Maunder minimum phase?
Rafael Ramon Ferreira, Rafaella Barbosa, Matthieu Castro +4
One of the most enigmatic phenomena related to solar activity is the so-called Maunder minimum phase. It consists of the lowest sunspot's counting ever registered for the Sun, and…
High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun
TalaWanda R. Monroe, Jorge Meléndez, Iván RamÃrez +13
We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with preci…
Spectroscopic and asteroseismic analysis of the secondary clump red giant HD 226808
Bruno Lustosa De Moura, Paul G. Beck, Leandro de Almeida +5
In order to clarify the properties of the secondary clump star HD 226808 (KIC 5307747), we combined four years of data from Kepler space photometry with high-resolution spectroscop…