99 citations · 640 across the 23 of their papers we have counts for
17 papers · 1 filter
The 2023 outburst of the Gaia alerted EXor Gaia23bab
Zsófia Nagy, Ágnes Kóspál, Péter Ábrahám +33
Episodic accretion is a fundamental process in the build-up of the stellar mass. EX Lupi-type eruptive young stars (EXors) represent one of the main types of episodic accretion. We…
The GAPS Programme with HARPS-N at TNG. X. Differential abundances in the XO-2 planet hosting binary
K. Biazzo, R. Gratton, S. Desidera +26
Binary stars hosting exoplanets are a unique laboratory where chemical tagging can be performed to measure with high accuracy the elemental abundances of both stellar components, w…
CAOS spectroscopy of Am stars Kepler targets
G. Catanzaro, V. Ripepi, K. Biazzo +6
The {\it Kepler} space mission and its {\it K2} extension provide photometric time series data with unprecedented accuracy. These data challenge our current understanding of the me…
Evidence from stellar rotation of enhanced disc dispersal: (I) The case of the triple visual system BD-21 1074 in the Pictoris association
S. Messina, B. Monard, K. Biazzo +2
The early stage of stellar evolution is characterized by a star-disc locking mechanism. The disc-locking prevents the star to spin its rotation up, and its timescale depends on the…
The Gaia-ESO Survey: metallicity of the Chamaeleon I star forming region
L. Spina, S. Randich, F. Palla +37
Context. Recent metallicity determinations in young open clusters and star-forming regions suggest that the latter may be characterized by a slightly lower metallicity than the Sun…
Three planetary companions around M67 stars
A. Brucalassi, L. Pasquini, R. Saglia +7
For the past six years we have carried out a search for massive planets around main sequence and evolved stars in the open cluster (OC) M67, using radial velocity (RV) measurements…
X-Shooter spectroscopy of young stellar objects III. Photospheric and chromospheric properties of Class III objects
B. Stelzer, A. Frasca, J. M. Alcala +7
We analyzed X-Shooter/VLT spectra of 24 ClassIII sources from three nearby star-forming regions (sigmaOrionis, LupusIII, and TWHya). We determined the effective temperature, surfac…
Characterizing two solar-type Kepler subgiants with asteroseismology: KIC10920273 and KIC11395018
G. Dogan, T. S. Metcalfe, S. Deheuvels +27
Determining fundamental properties of stars through stellar modeling has improved substantially due to recent advances in asteroseismology. Thanks to the unprecedented data quality…
The Chamaeleon II low-mass star-forming region: radial velocities, elemental abundances, and accretion properties
K. Biazzo, J. M. Alcalá, E. Covino +3
Radial velocities, elemental abundances, and accretion properties of members of star-forming regions (SFRs) are important for understanding star and planet formation. While infrare…
Crossing the Gould Belt in the Orion vicinity
K. Biazzo, J. M. Alcalá, E. Covino +5
We present a study of the large-scale spatial distribution of 6482 RASS X-ray sources in approximately 5000 deg^2 in the direction of Orion. We examine the astrophysical properties…
The ultracool dwarf DENIS-P J104814.7-395606. Chromospheres and coronae at the low-mass end of the main-sequence
B. Stelzer, J. Alcala, K. Biazzo +8
We have obtained an XMM-Newton observation and a broad-band spectrum from the ultraviolet to the near infrared with X-Shooter for one of the nearest M9 dwarfs, DENIS-P J1048-3956 (…
Large-scale young Gould Belt stars across Orion
K. Biazzo, J. M. Alcalá, M. F. Sterzik +3
We report first results on the large-scale distribution of the ROSAT All-Sky Survey (RASS) X-ray sources in a 5000 deg^2 field centered on Orion. Our final aim is to study the prop…
Magnetic activity and differential rotation in the very young star KIC 8429280
A. Frasca, H. -E. Fröhlich, A. Bonanno +3
We present a spectroscopic/photometric analysis of the rapid rotator KIC8429280, discovered by ourselves as a very young star and observed by the Kepler mission. We use spectroscop…
Elemental abundances of low-mass stars in the young clusters 25 Ori and lambda Ori
K. Biazzo, S. Randich, F. Palla +1
Aims. We aim to derive the chemical pattern of the young clusters 25 Orionis and lambda Orionis through homogeneous and accurate measurements of elemental abundances. Methods. We p…
Photospheric and chromospheric activity on the young solar-type star HD 171488
A. Frasca, K. Biazzo, Zs. Kovari +2
We present the results of contemporaneous spectroscopic and photometric monitoring of the young solar-type star HD171488 (Prot~1.337 d) aimed at studying surface inhomogeneities at…
Ground-based observations of Kepler asteroseismic targets
K. Uytterhoeven, R. Szabo, J. Southworth +42
We present the ground-based activities within the different working groups of the Kepler Asteroseismic Science Consortium (KASC). The activities aim at the systematic characterizat…
The young active star SAO 51891 (V383 Lac)
Katia Biazzo, Antonio Frasca, Ettore Marilli +5
Our aim is investigating surface inhomogeneities of the young late-type star SAO51891, from photosphere to upper chromosphere, analyzing contemporaneous high-resolution spectra and…