A5072113237- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astronomical and nuclear sciences
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Molecular spectroscopy and chirality
- Distributed and Parallel Computing Systems
- Spectroscopy and Chemometric Analyses
- History and Developments in Astronomy
- Molecular Spectroscopy and Structure
- Solar and Space Plasma Dynamics
- Biomedical and Engineering Education
- Satellite Image Processing and Photogrammetry
- Spectroscopy and Laser Applications
- Scientific Measurement and Uncertainty Evaluation
- Semiconductor materials and interfaces
Institut d'Estudis Espacials de Catalunya
2022-2024
Universitat de Barcelona
2019-2024
Leibniz Institute for Astrophysics Potsdam
2014-2022
Laboratório Interinstitucional de e-Astronomia
2015-2021
Institut de Ciències del Cosmos
2021
Universidad de La Laguna
2015
TU Dresden
2014
Kiel University
1999
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using original SDSS wide-field imager, and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution novel interferometer. All SDSS-III are now made public. In particular, this paper describes Data Release 11 (DR11) including all acquired through 2013 July, 12 (DR12) adding July (including included in previous releases), marking end observing. Relative our public...
Abstract We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands Milky Way stars at high resolution and signal-to-noise ratios in near-infrared. Mapping Nearby Galaxies (MaNGA) survey obtaining spatially resolved spectroscopy for nearby galaxies (median <?CDATA $z\sim 0.03$?> ). extended Baryon Oscillation Spectroscopic (eBOSS)...
The Sloan Digital Sky Survey (SDSS) has been in operation since 2000 April. This paper presents the Tenth Public Data Release (DR10) from its current incarnation, SDSS-III. data release includes first spectroscopic Apache Point Observatory Galaxy Evolution Experiment (APOGEE), along with Baryon Oscillation Spectroscopic (BOSS) taken through 2012 July. APOGEE instrument is a near-infrared R ∼ 22,500 300 fiber spectrograph covering 1.514–1.696 μm. survey studying chemical abundances and radial...
This paper documents the seventeenth data release (DR17) from Sloan Digital Sky Surveys; fifth and final fourth phase (SDSS-IV). DR17 contains complete of Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal surveying over 10,000 nearby galaxies. The MaNGA Stellar Library (MaStar) accompanies this data, providing observations almost 30,000 stars through instrument during bright time. also Galactic Evolution Experiment 2 (APOGEE-2) survey publicly...
The Apache Point Observatory Galactic Evolution Experiment (APOGEE), one of the programs in Sloan Digital Sky Survey III (SDSS-III), has now completed its systematic, homogeneous spectroscopic survey sampling all major populations Milky Way. After a three year observing campaign on 2.5-m Telescope, APOGEE collected half million high resolution (R~22,500), S/N (>100), infrared (1.51-1.70 microns) spectra for 146,000 stars, with time series information via repeat visits to most these stars....
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since 2014 July. This paper describes second data release from this phase, and 14th SDSS overall (making Data Release Fourteen or DR14). makes taken by SDSS-IV its first two years (2014–2016 July) public. Like all previous releases, DR14 is cumulative, including most recent reductions calibrations phase began operations 2000. New public extended Baryon Oscillation Spectroscopic Survey; Apache Point...
Abstract The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) began observations in 2014 July. It pursues three core programs: Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2), Mapping Nearby Galaxies at APO (MaNGA), and Extended Baryon Oscillation Spectroscopic (eBOSS). As well as its program, eBOSS contains two major subprograms: Time Domain (TDSS) SPectroscopic IDentification ERosita Sources (SPIDERS). This paper describes first data release from SDSS-IV,...
Using a sample of 69,919 red giants from the SDSS-III/APOGEE Data Release 12, we measure distribution stars in [α/Fe] versus [Fe/H] plane and metallicity functions (MDFs) across an unprecedented volume Milky Way disk, with radius 3 < R 15 kpc height kpc. Stars inner disk (R 5 kpc) lie along single track [Fe/H], starting α-enhanced, metal-poor ending at ∼ 0 +0.4. At larger radii find two distinct sequences space, roughly solar-α sequence that spans decade high-α merges low-α super-solar...
This paper documents the sixteenth data release (DR16) from Sloan Digital Sky Surveys; fourth and penultimate phase (SDSS-IV). is first of southern hemisphere survey Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2); new APOGEE-2 North are also included. DR16 notable as final for main cosmological program Extended Baryon Oscillation Spectroscopic Survey (eBOSS), all raw reduced spectra that project released here. includes Time Domain (TDSS) SPectroscopic IDentification...
The SDSS-III/APOGEE survey operated from 2011-2014 using the APOGEE spectrograph, which collects high-resolution (R~22,500), near-IR (1.51-1.70 microns) spectra with a multiplexing (300 fiber-fed objects) capability. We describe data products that are publicly available, include catalogs radial velocity, stellar parameters, and 15 elemental abundances for over 150,000 stars, as well more than 500,000 these quantities derived. Calibration relations parameters (Teff, log g, [M/H], [alpha/M])...
Combining the precise parallaxes and optical photometry delivered by Gaia's second data release (Gaia DR2) with photometric catalogues of PanSTARRS-1, 2MASS, AllWISE, we derive Bayesian stellar parameters, distances, extinctions for 265 million stars brighter than G=18. Because wide wavelength range used, our results substantially improve accuracy precision previous extinction effective temperature estimates. After cleaning both unreliable input output data, retain 137 stars, which achieve a...
Context. Many of the open clusters listed in modern catalogues were initially reported by visual astronomers as apparent overdensities bright stars. As observational techniques and analysis methods continue to improve, some them have been shown be chance alignments stars not true clusters. Recent publications making use Gaia DR2 data provided membership lists for over a thousand clusters, however, many nearby objects literature so far evaded detection. Aims. We aim update cluster census...
We employ the first two years of data from near-infrared, high-resolution SDSS-III/APOGEE spectroscopic survey to investigate distribution metallicity and α-element abundances stars over a large part Milky Way disk. Using sample ≈10, 000 kinematically unbiased red-clump with ∼5% distance accuracy as tracers, [α/Fe] versus [Fe/H] this exhibits bimodality in at intermediate metallicities, −0.9 < <−0.2, but higher metallicities ([Fe/H] ∼+0.2) sequences smoothly merge. effects APOGEE selection...
Formation of globular clusters (GCs), the Galactic bulge, or galaxy bulges in general, are important unsolved problems astronomy. Homogeneous infrared observations large samples stars belonging to GCs and bulge field one best ways study these problems. We report discovery by APOGEE a population inner Galaxy with abundances N, C, Al that typically found GC stars. The newly discovered have high [N/Fe], which is correlated [Al/Fe] anti-correlated [C/Fe]. They homogeneously distributed across,...
Open clusters are key targets for both Galaxy structure and evolution stellar physics studies. Since \textit{Gaia} DR2 publication, the discovery of undetected has proven that our samples were not complete. Our aim is to exploit Big Data capabilities machine learning detect new open in DR2, complete cluster sample enable further studies on Galactic disc. We use a based methodology systematically search disc, looking overdensities astrometric space identifying them as using photometric...
Understanding the formation and evolution of our Galaxy requires accurate distances, ages chemistry for large populations field stars.Here we present several updates to spectro-photometric distance code, that can now also be used estimate ages, masses, extinctions individual stars.Given a set measured spectrophotometric parameters, calculate posterior probability distribution over given grid stellar evolutionary models, using flexible Galactic stellar-population priors.The code (called...
We present a catalogue of 362 million stellar parameters, distances, and extinctions derived from Gaia's early third data release (EDR3) cross-matched with the photometric catalogues Pan-STARRS1, SkyMapper, 2MASS, AllWISE. The higher precision Gaia EDR3 data, combined broad wavelength coverage additional surveys new stellar-density priors {\tt StarHorse} code allow us to substantially improve accuracy over previous photo-astrometric stellar-parameter estimates. At magnitude $G=14\, (17)$,...
We combine high-resolution spectroscopic data from APOGEE-2 Survey Data Release 16 (DR16) with broad-band photometric several sources, as well parallaxes {\it Gaia} 2 (DR2). Using the Bayesian isochrone-fitting code {\tt StarHorse}, we derive distances, extinctions and astrophysical parameters for around 388,815 APOGEE stars, achieving typical distance uncertainties of $\sim 6\%$ giants, 2\%$ dwarfs, extinction 0.07$ mag when all information is available, 0.17$ if optical photometry missing....
The improvements in the precision of published data \textit{Gaia} EDR3 with respect to DR2, particularly for parallaxes and proper motions, offer opportunity increase number known open clusters Milky Way by detecting farther fainter objects that have so far go unnoticed. Our aim is keep completing cluster census detection new stellar groups Galactic disc. We use up magnitude $G = 18$ mag, increasing one unit limit therefore search volume explored our previous studies. \texttt{OCfinder}...
Context. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) features the first multi-object high-resolution fiber spectrograph in near-infrared ever built, thus making survey unique its capabilities: APOGEE is able to peer through dust that obscures stars disc and bulge optical wavelength range. Here we explore data included as part of Sloan Digital Sky Survey's 10th release (SDSS DR10).
We present a first determination of distances and extinctions for individual stars in the release APOKASC catalogue, built from joint efforts Apache Point Observatory Galactic Evolution Experiment (APOGEE) Kepler Asteroseismic Science Consortium (KASC). Our method takes into account spectroscopic constraints derived APOGEE Stellar Parameters Chemical Abundances Pipeline, together with asteroseismic parameters KASC. These are then employed to estimate intrinsic stellar properties, including...
We report the discovery of a group apparently young CoRoT red-giant stars exhibiting enhanced [alpha/Fe] abundance ratios (as determined from APOGEE spectra) with respect to Solar values. Their existence is not explained by standard chemical evolution models Milky Way, and shows that chemical-enrichment history Galactic disc more complex. find similar in previously published samples for which isochrone-ages could be robustly obtained, although smaller relative numbers, explain why these have...
We derive age constraints for 1639 red giants in the APOKASC sample which seismic parameters from Kepler, as well effective temperatures, metallicities and [α/Fe] values APOGEE DR12 (Apache Point Observatory Galactic Evolution Experiment Data Release 12) are available. investigate relation between chemical abundances these stars, using a simple robust approach to obtain ages. first stellar masses standard scaling relations, then determine maximum possible each star function of its mass...
We present a semi-empirical, largely model-independent approach for estimating Galactic birth radii, r_birth, Milky Way disk stars. The technique relies on the justifiable assumption that negative radial metallicity gradient in interstellar medium (ISM) existed most of lifetime. Stars are projected back to their positions according observationally derived age and [Fe/H] with no kinematical information required. Applying our AMBRE:HARPS HARPS-GTO local samples, we show can constrain ISM...