BaSTI, a Bridge between Grid and Virtual Observatory Part 1: BaSTI inside the VO (original) (raw)
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ITVO and BaSTI: databases and services for cosmological and stellar models
2009
We have created a database structure to store the metadata of different types of cosmological simulations (Gadget, Enzo, FLY) and the first relational database for stellar evolution models BaSTI, it includes tracks and isochrones computed with the FRANEC code. We are also studying the feasibility of including different sets of theory data and services in the Virtual Observatory (VObs). Some
BASTI: an interactive database of updated stellar evolution models
2006
We present a new database of stellar evolution models for a large range of masses and chemical compositions, based on an up-to-date theoretical framework. We briefly discuss the physical inputs and the assumptions adopted in computing the stellar models. We explain how to access to the on-line archive and briefly discuss the interactive WEB tools that can be used to compute user-specified evolutionary tracks/isochrones/luminosity functions. The future developments of this database are also outlined.
Feeding an astrophysical database via distributed computing resources: The case of BaSTI
Astronomy and Computing, 2015
Stellar evolution model databases, spanning a wide ranges of masses and initial chemical compositions, are nowadays a major tool to study Galactic and extragalactic stellar populations. The Bag of Stellar Tracks and Isochrones (BaSTI) database is a VO-compliant theoretical astrophysical catalogue that collects fundamental data sets involving stars formation and evolution. The creation of this database implies a large number of stellar evolutionary computations that are extremely demanding in term of computing power. Here we discuss the efforts devoted to create and update the database using Distributed Computing Infrastructures and a Science Gateway and its future developments within the framework of the Italian Virtual Observatory project.
BaSTI: the Virtual Observatory meets the Computational Grid
We present the prototype of the new BaSTI web portal. This portal is a GRID and Virtual Observatory integrated facility that allows to exploit the computational and storage capabilities of the EGEE-II GRID environment from a Virtual Observatory compliant web portal. This facility provides data access to large sets of stellar evolution models, it is also able to create on-the-fly models submitting a large number of jobs on the GRID and collecting the results. This portal is a first example of a service that is able to bridge two different GRID environments: the Virtual Observatory and the EGEE-II computational and data GRID.
The Dartmouth Stellar Evolution Database
The Astrophysical Journal Supplement Series, 2008
The ever-expanding depth and quality of photometric and spectroscopic observations of stellar populations increase the need for theoretical models in regions of age-composition parameter space that are largely unexplored at present. Stellar evolution models that employ the most advanced physics and cover a wide range of compositions are needed to extract the most information from current observations of both resolved and unresolved stellar populations. The Dartmouth Stellar Evolution Database is a collection of stellar evolution tracks and isochrones that spans a range of [Fe/H] from-2.5 to +0.5, [α/Fe] from-0.2 to +0.8 (for [Fe/H] ≤0) or +0.2 (for [Fe/H] >0), and initial He mass fractions from Y=0.245 to 0.40. Stellar evolution tracks were computed for masses between 0.1
Micro-simulations Inside the VO: the BaSTI Case
2009
A generalization of the Theoretical Spectral Access Protocol (TSAP) standard called Simple Self-described Service Protocol (S3P) has been used to search and access stellar model data. In particular, a Web server has been implemented that searches for synthetic isochrones and tracks computed using the FRANEC code and stored inside the BaSTI (a Bag of Stellar Tracks and Isochrones) relational database.
The Pisa Stellar Evolution Data Base for low-mass stars
Astronomy & Astrophysics, 2012
Context. The last decade showed an impressive observational effort from the photometric and spectroscopic point of view for ancient stellar clusters in our Galaxy and beyond, leading to important and sometimes surprising results. Aims. The theoretical interpretation of these new observational results requires updated evolutionary models and isochrones spanning a wide range of chemical composition so that the possibility of multipopulations inside a stellar cluster is also taken also into account. Methods. With this aim we built the new "Pisa Stellar Evolution Database" of stellar models and isochrones by adopting a welltested evolutionary code (FRANEC) implemented with updated physical and chemical inputs. In particular, our code adopts realistic atmosphere models and an updated equation of state, nuclear reaction rates and opacities calculated with recent solar elements mixture. Results. A total of 32 646 models have been computed in the range of initial masses 0.30 ÷ 1.10 M for a grid of 216 chemical compositions with the fractional metal abundance in mass, Z, ranging from 0.0001 to 0.01, and the original helium content, Y, from 0.25 to 0.42. Models were computed for both solar-scaled and α-enhanced abundances with different external convection efficiencies. Correspondingly, 9720 isochrones were computed in the age range 8÷15 Gyr, in time steps of 0.5 Gyr. The whole database is available to the scientific community on the web. Models and isochrones were compared with recent calculations available in the literature and with the color-magnitude diagram of selected Galactic globular clusters. The dependence of relevant evolutionary quantities, namely turn-off and horizontal branch luminosities, on the chemical composition and convection efficiency were analyzed in a quantitative statistical way and analytical formulations were made available for reader's convenience. These relations can be useful in several fields of stellar evolution, e.g. evolutionary properties of binary systems, synthetic models for simple stellar populations and for star counts in galaxies, and chemical evolution models of galaxies.
The Astronomical Journal, 2007
Stellar evolution tracks and isochrones are key inputs for a wide range of astrophysical studies; in particular, they are essential to the interpretation of photometric and spectroscopic observations of resolved and unresolved stellar populations. We have made available to the astrophysical community a large, homogenous database of up-to-date stellar tracks and isochrones, and a set of programs useful in population synthesis studies. In this paper we first summarize the main properties of our stellar model database (BaSTI) already introduced in Pietrinferni et al. (2004) and Pietrinferni et al. (2006). We then discuss an important update of the database, i.e., the extension of all stellar models and isochrones until the end of the thermal pulses along the Asymptotic Giant Branch. This extension of the library is particularly relevant for stellar population analyses in the near-infrared, or longer wavelengths, where the contribution to the integrated photometric properties by cool and bright Asymptotic Giant Branch stars is significant. A few comparisons with empirical data are also presentend and briefly discussed. We then present three web-tools that allow an interactive access to the database, and make possible to compute user-specified evolutionary tracks, isochrones, stellar luminosity functions, plus synthetic Color-Magnitude-Diagrams and integrated magnitudes for arbitrary Star Formation Histories. All these web tools are available at the BaSTI database official site: http://www.oa-teramo.inaf.it/BASTI.
Italian Theoretical Virtual Observatory (ITVO): cosmological simulations in the VO frame
2009
Cosmological simulations' output can be stored in an archive and ingested into a database. Then can be connected to a web interface to allow the end user to explore it. This matches the VO idea of handling the data directly on the server side leaving the user only with the results of the query, or other end products, on his own machine. Besides data searching data centers are then requested to provide services to let the user preview and analyze data and metadata (both generated on-the-fly or pre-computed) with computing performed on the server side and letting only the results to be visualized on the user desktop (or sent to him). Here we present the IA2-ITVO (Italian Center for Astronomical Archives - Italian Theoretical Virtual Observatory) archive web interface mainly focusing on the 'Level 2' post-processing capabilities of the portal and its connection with other VO tools.