E. Distefano
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View article: Rotation of young solar-type stars as seen by <i>Gaia</i> and K2
Rotation of young solar-type stars as seen by <i>Gaia</i> and K2 Open
Context . Accurate surface rotation measurements are crucial to estimate stellar ages and improve our understanding of stellar rotational evolution. Comparisons of datasets obtained from different space missions on common targets represent…
View article: <i>Gaia</i>Data Release 3
<i>Gaia</i>Data Release 3 Open
Context. Gaia has been in operations since 2014, and two full data releases (DR) have been delivered so far: DR1 in 2016 and DR2 in 2018. The third Gaia data release expands from the early data release (EDR3) in 2020, which contained the f…
View article: <i>Gaia</i>Data Release 3
<i>Gaia</i>Data Release 3 Open
Context. Gaia DR3 contains 1.8 billion sources with G -band photometry, 1.5 billion of which with G BP and G RP photometry, complemented by positions on the sky, parallax, and proper motion. The median number of field-of-view transits in t…
View article: Gaia Data Release 3: All-sky classification of 12.4 million variable sources into 25 classes
Gaia Data Release 3: All-sky classification of 12.4 million variable sources into 25 classes Open
Gaia DR3 contains 1.8 billion sources with G-band photometry, 1.5 billion of which with BP and RP photometry, complemented by positions on the sky, parallax, and proper motion. The median number of field-of-view transits in the three photo…
View article: <i>Gaia</i>Data Release 3
<i>Gaia</i>Data Release 3 Open
Context. In current astronomical surveys with ever-increasing data volumes, automated methods are essential. Objects of known classes from the literature are necessary to train supervised machine-learning algorithms and to verify and valid…
View article: <i>Gaia</i>Data Release 3
<i>Gaia</i>Data Release 3 Open
Context. The Gaia third Data Release (GDR3) presents a catalogue of 474 026 stars (detected by processing a sample of about 30 million late-type stars) with variability induced by magnetic activity. About 430 000 of these stars are newly d…
View article: <i>Gaia</i> Data Release 3
<i>Gaia</i> Data Release 3 Open
Context. The Gaia Radial Velocity Spectrometer (RVS) provides the unique opportunity of a spectroscopic analysis of millions of stars at medium resolution ( λ /Δ λ ∼ 11 500) in the near-infrared (845−872 nm). This wavelength range includes…
View article: Gaia Data Release 3: Cross-match of Gaia sources with variable objects from the literature
Gaia Data Release 3: Cross-match of Gaia sources with variable objects from the literature Open
Context. In the current ever increasing data volumes of astronomical surveys, automated methods are essential. Objects of known classes from the literature are necessary for training supervised machine learning algorithms, as well as for v…
View article: Gaia Data Release 3. Summary of the variability processing and analysis
Gaia Data Release 3. Summary of the variability processing and analysis Open
Context. Gaia has been in operations since 2014. The third Gaia data release expands from the early data release (EDR3) in 2020 by providing 34 months of multi-epoch observations that allowed us to probe, characterise and classify systemat…
View article: Gaia Data Release 3. Stellar chromospheric activity and mass accretion from Ca II IRT observed by the Radial Velocity Spectrometer
Gaia Data Release 3. Stellar chromospheric activity and mass accretion from Ca II IRT observed by the Radial Velocity Spectrometer Open
The Gaia Radial Velocity Spectrometer provides the unique opportunity of a spectroscopic analysis of millions of stars at medium-resolution in the near-infrared. This wavelength range includes the Ca II infrared triplet (IRT), which is a g…
View article: Gaia Data Release 3. Rotational modulation and patterns of colour variations in solar-like variables
Gaia Data Release 3. Rotational modulation and patterns of colour variations in solar-like variables Open
The Gaia third Data Release (DR3) presents a catalogue of 474\,026 stars with variability induced by magnetic activity. For each star, the catalogue provides a list of about 70 parameters among which the most important are the stellar rota…
View article: <i>Gaia</i> Data Release 2
<i>Gaia</i> Data Release 2 Open
Context. Amongst the ≈5 × 10 5 sources identified as variable stars in Gaia Data Release 2 (DR2), 26% are rotational modulation variable candidates of the BY Dra class. Gaia DR2 provides their multi-band ( G , G BP , and G RP ) photometric…
View article: Proteus Stars: Evidence of New Magnetic Transitions in Late-Type Dwarfs from the Second Gaia Data Release
Proteus Stars: Evidence of New Magnetic Transitions in Late-Type Dwarfs from the Second Gaia Data Release Open
The second Gaia data release contains the identification of 147 535 rotation modulation variables candidates of the BY Dra class, together with their rotation period and modulation amplitude. The richness, the period and amplitude range, a…
View article: Gaia Data Release 2: Rotational modulation in late-type dwarfs
Gaia Data Release 2: Rotational modulation in late-type dwarfs Open
We present the methods devised to identify the BY Dra variables candidates in Gaia DR2 and infer their variability parameters. BY Dra candidates are pre-selected from their position in the HR diagram, built from Gaia parallaxes, $G$ magnit…
View article: Gaia Data Release 2: Summary of the variability processing & analysis results
Gaia Data Release 2: Summary of the variability processing & analysis results Open
The Gaia Data Release 2 (DR2): we summarise the processing and results of the identification of variable source candidates of RR Lyrae stars, Cepheids, long period variables (LPVs), rotation modulation (BY Dra-type) stars, delta Scuti & SX…
View article: Activity cycles in members of young loose stellar associations
Activity cycles in members of young loose stellar associations Open
Magnetic cycles have been detected in tens of solar-like stars. The\nrelationship between the cycle properties and global stellar parameters is not\nfully understood yet.\n We searched for activity cycles in 90 solar-like stars with ages b…
View article: Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region
Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region Open
The ESA Gaia mission provides a unique time-domain survey for more than one billion sources brighter than G=20.7 mag. Gaia offers the unprecedented opportunity to study variability phenomena in the Universe thanks to multi-epoch G-magnitud…
View article: Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region
Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region Open
The ESA Gaia mission provides a unique time-domain survey for more than one billion sources brighter than G=20.7 mag. Gaia offers the unprecedented opportunity to study variability phenomena in the Universe thanks to multi-epoch G-magnitud…
View article: Impact of photometric variability on age and mass determination of Young Stellar Objects: A case study on Orion Nebula Cluster
Impact of photometric variability on age and mass determination of Young Stellar Objects: A case study on Orion Nebula Cluster Open
In case of pre-main sequence objects, the only way to determine age and mass is by fitting theoretical isochrones on color-magnitude (alternatively luminosity-temperature) diagrams. Since young stellar objects exhibit photometric variabili…
View article: Do stars converging to the slow-rotator sequence possess inflated radii?
Do stars converging to the slow-rotator sequence possess inflated radii? Open
Average stellar radii in open clusters can be estimated from rotation periods and projected rotational velocities under the assumption of random orientation of the spin axis. Such estimates are independent of distance, interstellar absorpt…
View article: Lower limit for differential rotation in members of young loose stellar associations
Lower limit for differential rotation in members of young loose stellar associations Open
Surface differential rotation (SDR) plays a key role in dynamo models. SDR\nestimates are therefore essential for constraining theoretical models. We\nmeasure a lower limit to SDR in a sample of solar-like stars belonging to young\nassocia…
View article: Physical parameters and long-term photometric variability of V1481 Ori, an SB2 member of Orion nebula Cluster with an accreting component
Physical parameters and long-term photometric variability of V1481 Ori, an SB2 member of Orion nebula Cluster with an accreting component Open
We present the results of our analysis on V1481 Ori (JW 239), a young SB2 in the Orion nebula Cluster with a circumbinary disc accreting on the lower mass component. The analysis is based on high-resolution spectroscopic data and high-qual…