Transcript Slide 1

The new version of Binary stars database (BDB)
P. Kaygorodov1, B. Debray2, N. Kolesnikov3, D. Kovaleva1, O. Malkov1
1 INASAN, 2 Observatoire
de Besançon, 3 SAI MSU
The new version of BDB database that combines data from a variety of catalogues of binary stars is presented. The main
goal of BDB is to allow user to interrogate of data for all categories of binary stars. The technologies, which the current version of BDB
was built on, don't allow effectively integrate it into a modern infrastructure. So, in 2010 it was decided to create a new version using the
recent tools. The new version is written in Python and based on Nagare framework, which allows to create web applications with
natively integrated Web 2.0 features. The PostgreSQL database is used for data storage. To date, the backend parts of the new version
is almost done, including the tools for importing catalogues from VizieR. At present, efforts are focused on frontend modules, including
searching, real-time communications with other databases and cross-identification tools.
Introduction
Binary stars are very common, and binaries provide accurate
data that are very difficult to determine for single stars, such as
masses and radii. The binary star data are those of single stars
extended to system characteristics. Usually data on different
classes of binaries are presented in particular databases, e.g.,
WDS, CHARA, SB9, etc. There is no database synthesizing the
various categories, and Binary star Data Base, BDB2 aims to fill
this gap. The main goal of BDB is to allow user to interrogate of
data for all categories of binary stars. To achieve this goal we
should integrate and provide an access to data from large
catalogues of binaries [CCDM, WDS, …]; to establish links with
databases of binary stars: [SB9, Sidonie, …] and general
databases [SIMBAD, IBVS, ...], and to integrate data from
catalogues of astrophysical parameters (masses, radii, etc.) of
binary components. Besides numerical data, BDB should also
contain images.
The following two main problems should be solved. First, right
data should be linked with right components. It includes a
development of a unique and consistent system for component
designations (A, Ab, B, AB, C, ...) and a solution of problem of
component identifications in different catalogues (crossidentification problem). The other problem is compilation of a list
of data sources (catalogues, databases) for binaries of different
types to be included in or linked with BDB.
Organization of BDB database:
From the set of catalogues (most of them was downloaded
from VizieR) we extract data on various types of binaries. Our
database contains two types of records: systems and pairs.
The records has the following fields, which can be used for
querying:
System
Right Ascension
Declination
Proper motion
Parallax
…
Pair
Angular separation
Position angle
Primary/secondary/combined magnitude
Primary/secondary/combined spec. type
Period
…
New fields can be added in future to extend query types. All
records hold ID’s from original catalogues. Each record can
include several ID’s. For example, CCDM catalogue has its
own ID, but also includes HD, DM, ADS/BDS and some
others. BDB has cross-identification table, so, querying by,
for example, HD identifier can return results from catalogues
that do not use HD identifiers, but contain the requested
object. Query result returns information from all catalogues,
containing requested object, but final output can be filtered by
user to include only selected data.
Queries to BDB
- Query by binary type (e.g., visual binary,
spectroscopic binary)
- Query by catalogue (e.g., WDS, Hipparcos)
- Query by identifier of binaries (e.g., ADS, CCDM)
- Query by coordinates
- Query by parameters of binaries (e.g., angular
separation, magnitude difference, component mass)
Output of query result (for one object or for a list
of objects): HTML, ASCII, XML (VOTable)
Query result
Fundamental data for CCDM 04078+6220 (user can check one
or more catalogues to retrieve data):
- ICRS: 04 07 51.3945 +62 19 48.367, pm = 0.13 –2.25, par =
0.48; 22 components
- A: ADS 2984 A, IDS 03590+6204 A, HD 25638, GCVS NSV
1458 GCVS CCDM V=6.99, B0III
- B: ADS 2984 B, IDS 03590+6204 B, GCVS SZ Cam, HIP
19270 GCVS SB9 ecl_HIP CCDM V=7.26, O9.5V+B0, P=2.7
- Bab: INT4 CCDM ,=(300,0.071)
- Bb: SB9 CCDM P=2.8
- AB: BD +61 676 WDS CCDM V=7.0+7.1, B0, ,=(304,17.9)
- AC: HIP 19272 WDS CCDM V=7.0+12.9, B0, ,=(257,6.0)
- ….
- AQ: WDS INT4 CCDM V=6.91+13.2, ,=(325,45.2)
Retrieved data
Data extracted from selected catalogues shown as a set of tables.
Descriptions of the tables can be revealed via [show] links