component. The coordinate part of a designation does not vary within the system (in spite of the fact that the components "1" and "2" can differ in coordinates).
Indicating a component designation, we in general follow the WDS notation, but we substitute capital letters for digits (for the upper level of system hierarchy) and small letters and digits for capital letters (for other levels). Thus, we introduce BSDB J043306.62+240954.9:p1BA-1BB for the pair WDS 04331+2410 Ab1,2. The proposed system is extended to other types of binaries. Note that our principal source of photometric (eclipsing) binaries, GCVS Samus et al. 2013, http://www.sai.msu.ru/groups/cluster/gcvs/), has the same coordinate precision as WDS and CCDM (Dommanget and Nys 2002), and the principal catalogue of spectroscopic binaries, SB9, is even more precise (here coordinates should be truncated — not rounded — to form a designation). A newly discovered distant component will be designated by the next vacant digit. The solution of a component in two sub-components will lead to an appearance of two new designations for the subcomponents, with letters A and B in two subsequent positions (e.g., subcomponents 2A and 2B will appear when the component 2 is resolved). In the latter case, the resolved component designation (BSDB Jxxxxxx.xx+xxxxxx.x:c2) will be moved to the "outdated BSDB name" column, and a new designation for the pair (BSDB Jxxxxxx.xx+xxxxxx.x:p2A-2B) will be constructed.
To provide BSDB numbers for all binary systems included in the BDB, we are working to appoint BSDB identifiers to binary and multiple stars of every observational type. For this purpose, we are compiling the general catalog of identifications of binaries, preliminarily named Identification List of Binaries, ILB. The ILB should include BSDB identifications for all binary systems included in the catalogs up to date, as well as leave such possibility open for the coming binary lists/catalogs/surveys.
The most representative catalogues of binary systems (from wide to close pairs) are gradually connected to the ILB. If an object is encountered for the first time, a unique BSDB identifier is attributed to it. Objects that already exist in the previously investigated catalogues are appended to the corresponding ILB entries. New objects (pairs, components) included in stellar systems already existing in ILB lead to adjustments of the relevant sections of the catalog. ILB provides cross-identification with the following widely-used and/or binary identifiers: Name/Bayer/Flamsteed, HD, HIP, GCVS, DM (BD, CD, CPD), CCDM, WDS, ADS, IDS, SBC9, IGR, PSR. Cross-ID problems are solved at this stage, and to do it properly, all available information (positional, photometric and sometimes already contained in catalogues cross-identification) is taken into account.
We believe that the principles underlaying BSDB identifier compilation do satisfy the "IAU Specifications concerning designations for astronomical radiation sources outside the solar system" (unlike, say, similarly coordinate-based WDS and CCDM names). Also, one can easily make sure that the problems typical for binary/multiple-star designation schemes are basically avoided by the BSDB.
Kovaleva D., Malkov O., Kaygorodov P., Karchevskij A., Samus N. "BSDB: a new consistent designation scheme for identifying objects in binary and multiple stars" 2015, Baltic Astronomy, accepted
Kovaleva D.A., Debray B., Kaygorodov P.V., Malkov O.Yu., Oblak E. "VO-accessible Binary star DataBase BDB" 2015, Astronomy and Computing, submitted Ref:=2012BaltA..21..309K byKAYGORODOV P. , DEBRAY B., KOLESNIKOV N., KOVALEVA D., MALKOV O. Baltic Astronomy, 21, 309-318 (2012) The New Version of the Binary Star Database (bdb). Ref:=2014A&AT...28..235M Institute of Astronomy, Moscow
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