The unrivalled astrometric and photometric capabilities of the Gaia mission have given new impetus to study young stars: both from an environmental perspective, as members comoving star-forming regions, individual targets amenable planet-hunting direct-imaging observations. In view large availability theoretical evolutionary models, fields would benefit a unified framework that allows straightf...

Context. Stellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques estimate stellar highly model-dependent. The lithium depletion boundary (LDB), based on the presence or absence in low-mass stars, can be used derive associations between 20 and 500 Ma. Aims. purpose this work is revise former LDB a consistent way, taking advantage homogen...

ABSTRACT We announce the discovery of GPX-1 b, a transiting brown dwarf with mass 19.7 ± 1.6 MJup and radius 1.47 0.10 RJup, first substellar object discovered by Galactic Plane eXoplanet (GPX) survey. The transits moderately bright (V = 12.3 mag) fast-rotating F-type star projected rotational velocity $v\sin {\, i_*}=40\pm 10$ km s−1. use isochrone placement algorithm to characterize host star...

This paper presents a deep investigation of two open clusters, Haffner 22 and Melotte 71, using astrometric photometric data from Gaia EDR3. We identified 382 597 most probable cluster members with membership probability higher than 50 percent. Mean proper motion in RA DEC are estimated as -1.63 2.889 respectively for -2.398 4.210 71. A comparison observed CMDs theoretical isochrones leads to a...

The mass of a star is the most fundamental parameter for its structure, evolution, and final fate. It particularly important any kind stellar archaeology characterization exoplanets. There exists variety methods in astronomy to estimate or determine it. In this review we present significant number such methods, beginning with direct model-independent approach using detached eclipsing binaries. ...

In recent decades, particularly intense changes have occurred in Spanish urban areas. This is the result of demographic and urbanizing transformations that led to a change city model. The predominance compact forms has been replaced by growing prominence sprawl. Structures are now more extensive, characterized, turn, fragmentation notable consumption land peripheries. medium-sized cities, munic...

This is the second paper of a series devoted to present an updated release BaSTI ( Bag Stellar Tracks and Isochrones) stellar model isochrone library. Following publication solar scaled library, here we library for $\alpha-$enhanced heavy element distribution. These new alpha-enhanced models account all improvements updates in reference metal distribution physics inputs, as The cover mass range...

We present the discovery of a candidate ultra-faint Milky Way satellite, Eridanus IV (DELVE J0505$-$0931), detected in photometric data from DECam Local Volume Exploration survey (DELVE). is faint ($M_V = -4.7 \pm 0.2$), extended ($r_{1/2} 75^{+16}_{-13}$ pc), and elliptical ($\epsilon 0.54 0.1$) system at heliocentric distance $76.7^{+4.0}_{-6.1}$ kpc, with stellar population that well-describ...

ABSTRACT Precise measurements of stellar parameters are required in order to develop our theoretical understanding structure. These enable errors and uncertainties be quantified models constrain the physical interpretation observed phenomena, such as inflated radii low-mass stars. We use newly-available TESS (Transiting Exoplanet Satellite Survey) light curves combined with published radial vel...