Search Publications
Determining the orbital parameters of binary systems with an AGB primary. The case of the R Aqr symbiotic system
Alcolea, J.; Bachiller, R.; Santander-García, M. +6 more
Binary stars including an AGB star hold the clues for understanding important phenomena in stellar evolution, such as common-envelope events, the formation of SN-Ia, and the origin of aspherical pPNe/PNe. Hydro-dynamical codes simulating the companion's influence on the primary mass loss exist, but we still lack information on the orbital paramete…
Parameters for >300 million Gaia stars: Bayesian inference vs. machine learning
Anders, F.; Chiappini, C.; Khalatyan, A. +2 more
The Gaia Data Release 3 (DR3), published in June 2022, delivers a diverse set of astrometric, photometric, and spectroscopic measurements for more than a billion stars. The wealth and complexity of the data makes traditional approaches for estimating stellar parameters for the full Gaia dataset almost prohibitive. We have explored different superv…
Searching for open clusters in Gaia DR3 using a parallax-blind approach
Carballo-Bello, Julio A.; Gran, Felipe; Peña-Ramírez, Karla +1 more
Gaia data is providing a unique opportunity to explore the structure of the Milky Way by discovering more and more of one of its best tracers: open clusters. Innovative algorithms, supported by Gaia accurate proper motions, parallaxes, photometry, and radial velocities (whenever available), have identified hundreds of new clusters of stars across …
The GALANTE Photometric Project: First results and the MUDEHaR extension
Maíz Apellániz, J.; Holgado, G.; Alfaro, E.
GALANTE is an optical (3000-9000 Å) photometric survey with seven intermediate/narrow filters that has been covering the northern Galactic Plane and some adjacent regions since 2016 using the Javalambre T80 telescope (P.I.s Emilio J. Alfaro & Jesús Maíz Apellániz). Originally designed to identify the majority of the early-type massive stars wi…
About the multiplicity of M dwarfs
Amado, P. J.; Caballero, J. A.; Reiners, A. +8 more
Stellar multiplicity is a common consequence of the stellar formation process. Low-mass stars are the prime constituent of the nearby stellar population, with late-type accounting for the majority of the hydrogen-fusing objects in the Solar neighborhood. The CARMENES input catalogue of M dwarfs (Carmencita) is a comprehensive and homogeneous sampl…
Gaia-based comparative study of protoplanetary disk frequencies in young stellar clusters
Mendigutía, I.; Huélamo, N.; Solano, E. +4 more
This poster presents the results of a recent work (https://www.aanda.org/articles/aa/full_html/2022/08/aa43146-22/aa43146-22.html {Mendigutía et al. 2022, A&A, 664, A66}), where we have compared protoplanetary disk frequencies inferred from 2 widely different regions corresponding to 2 pc and 20 pc from the centers of a representative sample o…
The power of XP Gaia spectrophotometry and Self-Organizing Maps to analyze the evolutionary state and physical properties of Milky Way stars
Garabato, D.; Dafonte, C.; Manteiga, M. +1 more
The Gaia space telescope is able to gather a vast amount of data from each of the sources it explores. Among them, are the Blue and Red Photometer (BP/RP) spectra, also known as XP spectra. Most of those sources (and their physical properties) are easy to identify, but for some others, it is necessary to perform a deeper study on them. More precis…
Spectral evolution and calcium white dwarfs in J-PLUS
Gänsicke, B. T.; Carrasco, J. M.; Tremblay, P. -E. +8 more
We complement the Gaia-based catalogue of white dwarfs with the optical photometry from the Javalambre Photometric Local Universe Survey (J-PLUS) DR2, covering $2 176$ deg$^2$ with 12 passbands ($ugriz$ + 7 medium bands). We define a common sample of $5 926$ white dwarfs with $r < 19.5$ mag and derive their effective temperature ($T_{eff})$, su…
Characterization of intermediate mass young stars from spectral energy distributions and Gaia EDR3
Guzmán-Díaz, J.
Herbig Ae/Be objects (HAeBes) are young, intermediate-mass stars surrounded by protoplanetary disks. From the point of view of star and planet formation, these objects have crucial characteristics. First, their stellar parameters, such as mass or temperature, are between those belonging to the low-mass and high-mass regimes. Second, the presence o…
Quantitative Spectroscopic Analysis of O stars in the IACOB+OWN project: Massive stars in the Galaxy with GAIA-DR3
Simón-Díaz, S.; Holgado, G.
Massive stars are luminous beacons that help us to extract information about the star formation history and the chemodynamical evolution of galaxies in the Universe. Our Galaxy is full of massive stars, which expend their short-lived existence within bright star-forming regions, depositing huge amounts of mechanical and radiative energy to the int…