The CHIANTI database consists of 4 primary ASCII files for each ion in the database. contains the energy levels in cm^(-1) It includes both experimental data and theoretical values of the levels energies. ... Wavelengths are based on experimental level energies where available; wavelengths calculated from theoretical energies are less accurate and are given as negative values. ... contains the spline fits to the electron collision strengths scaled according to Burgess and Tully (1992). ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

... We present a proposed standard for data dictionaries associated with catalogs being accessed through the Astrophysics Data System (ADS) Mosaic Catalog Service. Each catalog made available for searching must have a data dictionary, which consists of a set of specified keywords describing format, content and location of data. ... There are two keywords in the Table Data Dictionary which indicate to the server software that the corresponding column contains special attributes. ...

The original files with the data were in different formats. ... Such files were named "standard data files" and linked to the database. They can be easily transformed to any desirable format by a code. Here we present two simple computer programs of this kind. ... When running the code, you can specify columns in the output file: wavelength, energy (eV) or wavenumber (cm -1 ) as the first column, and complex refractive index or dielectric function as the second and third columns. ...

... MOTIVATION !Operations at observing sites should have quick and reliable access to the data, therefore observing sites are provided with their own local database server. ... SERVICE MODE OPERATIONS Standard service mode operations: !OBs produced by investigators are submitted to Garching. ... OBs moved to the operational database at Garching are replicated to the operational database at the observing sites by the same mechanism used for standard service mode Obs. ...

Next: Reduction procedure Up: Extinction and transformation Previous: Strategy . Standard stars can be included in the extinction solution, if one is careful. The problem is that there are usually appreciable ``conformity errors'' due to mismatch between the instrumental and the standard passbands [ 16 ]. ... Thus, it is wrong to assume that the transformation between the instrumental system and the standard system is exact, even if there were no measurement error in either system [ 1 ]. ...

... ARC 3.5m | Standard Stars . Bright Star Catalog - broken into smaller files for easier management by TUI: . ... Double Star Catalog . ... Various Standard Star Links and associated TUI Catalogs . ... Data from which the plots were produced are also available by ftp access from the standard star pages.- specstds.tui . HST UV spectrophotometric standards. Data for 23 stars based on IUE and optical spectra and calibrated by the primary WD standards. ... Echelle Standards - echstds.tui . ...

Possibilities for Database Archival and Access Brian Kent Cornell University bkent@astro.cornell.edu http ://w w w .astro.cornell.edu/~bkent/ Data Archive Objectives · Platform independent node/server, compatible with standard VO Web Service Protocols · Quick and easy access through the web to data using any web browser with standard plugins · Perform simple analysis and calculations on ... E-ALFA Ar chive 11 ...

Hide Zen home . ... Large scale survey projects produce huge amount of data, which needs to be processed and organized in databases to provide access by astronomical community. There are many problems in the current state of art of accessing large astronomical databases and organizing programmatic access to the distributed and diverse data, which Virtual Observatory initiative should eventually to solve. ... Nowadays, it's not unusual to work with billions of objects in terabyte-sized database. ...