Development of software for publication and data retrieval from virtual observatories,

Abstract

IVOA is an international alliance of national observatories. IVOA includes nineteen national and international projects of virtual observatory. The main purpose of IVOA is to cooperate archives of ground and space instruments. It will provide comfortable access to them for scientists, as well as providing astronomers with powerful researching mechanisms of observational data. The general tools for accessing information in IVOA are applications and services such as Astrogrid, Aladin, Topcat, SkyView. These tools allow users to work with surveys, directories and archives. Access to them will be provided according to IVOA standards. UrkVO -Ukrainian Virtual Observatory - was created five years ago as a part of the national project. CoLiTec Team created software for storage and publication of CCD-frames. Software allows you to archive and search frames by specified parameters (coordinates). External access to the storage is provided of its own web interface and can be accessed through Aladin. Software was implemented with using of VO technologies, including SIAP access protocol. It allows you to receive additional frames from external resources such as the SDSS and 2MASS. Currently, ISON-NM observatory is its main user and stores in open access on RINANU cluster about 50 000 frames taken from 2010. In the collaboration with Vihorlatskiy observatory automatic frames loader was created. It's process consists of several stages. On the first step user loads the raw frames to the server via the web interface. These raw frames will be moderated before its processing. At this stage faulty and unsupported frames will be rejected. OLDAS system processes frames as soon as they will be downloaded successfully. This technique allows to greatly speed up processing and provides user immediate notification of emerging issues. Processed data will be stored in the database and can be published through SIAP protocol. Further development of CoLiTec project as part of virtual observatory is focused on creation of the unique storage for light curves of variable stars and series of frames on which they were received. According to IVOA recommendations for photometric data storage the existing software for the frames storage will be extended with light curves via cross-references. This allows user to receive all relevant information such as required frames, light curves or brightness measurements. Integration with existing formats of photometric data representing is leading to create new solution that would allow to collect new formats from existing ones. This solution will provide flexibility and ability to convert values and it is based on subject mediators that will solve all of these challenges. Access to obtained results will be provided via web interface and international catalogs of variable stars, such as Vizier, AAVSO, VSX and others. Also the system of full photometry (objects brightness measurements on all frames) will be developed. Raw data for this system could be stored on our or another specified resources. This will solve new astronomical problems, find objects with properties that have not previously studied and make a lot of new discoveries.