Table information for 'dmubin.main'


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Resource Description: A collection of binary stars with a difference in instantaneous proper motion as measured by HIPPARCOS and the long-term proper motion.

For a list of all services and tables belonging to this table's resource, see Information on resource 'Delta-mu Binaries'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 1999A&A...346..675W (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.

To cite the table as such, we suggest the following BibTeX entry:

  title={Delta-mu Binaries},
  author={Wielen, R. and Dettbarn, C. and Jahrreiß, H. and Lenhardt, H. and Schwan, H.},
  howpublished={{VO} resource provided by the {GAVO} Data Center}

Resource Documentation

A Δμ binary is an object that has a statistcally signifcant difference between instantaneous proper motion (as measured by HIPPARCOS) and a longer-term proper motion as indicated by longer-term observations.

The HIPPARCOS proper motion is taken from the HIPPARCOS catalogue.

The mean proper motion is usually either taken directly from a ground-based astrometric catalogue (after having applied appropriate systematic corrections), or a new mean proper motion (μ0) is calculated from the ground-based position(s) and the HIPPARCOS position. The following catalogues have been used for obtaining mean proper motions:

The basic principles of the method are explained in the paper: Wielen, R., Dettbarn, C., Jahreiß, H., Lenhardt, H., Schwan, H.: Indications on the binary nature of individual stars derived from a comparison of their HIPPARCOS proper motions with ground-based data (see source metadatum).

The stars listed here are those investigated (ca. 90000) with one (or more) F-measures exceeding 3.44.

We list many newly detected binaries, but also ones already known from other data, e.g. visual ones. In many cases of already known binaries, the F values should be considered as qualitative 'flags' for binarity only, since the proper motions compared may not refer to the same 'reference point' (e.g., HIPPARCOS refers to component A, while the FK5 to the center-of-mass).


Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
hipno HIP# Catalog number in Hipparcos catalog N/A;meta.main
raj2000 RA(2000) Right ascension from Hipparcos deg pos.eq.ra;meta.main
dej2000 Dec(2000) Declination from Hipparcos deg pos.eq.dec;meta.main
comp Component Component for resolved binaries N/A meta.code
mv m_V Visual magnitude mag phot.mag;em.opt.V
color B-V Color index B-V, Hipparcos V magnitude mag phot.color;em.opt.B;em.opt.V
parallax Parallax Parallax from Hipparcos mas pos.parallax.trig
ffh F_FH F-Measure for proper motions FK5 vs. Hipparcos [Note F] N/A;;arith.diff
f0f F_0F F-measure for proper motions from FK5 vs. mu0F [Note F] N/A;;arith.diff
f0h F_0H F-measure for proper motions from Hipparcos vs. mu0F [Note F] N/A;;arith.diff
f0gch F_0GCH F-measure for proper motions from Hipparcos vs. mu0G [Note F] N/A;;arith.diff
ft2h F_T2H F-measure for proper motions from Hipparcos vs. Tycho-2 [Note F] N/A;;arith.diff
fmax F_max Maximum of F-measures reported [Note F] N/A;;arith.diff
FK FK FK Part the star was found in N/A meta.ref
GC GC Star Identifier in the GC N/A
T2 T2 Object is in Tycho-2 N/A meta.code
HD HD Star Identifier in the HD-Catalogue N/A
HR HR Star Identifier in the HR-Catalogue N/A
CNS4 CNS4 Star Identifier in CNS4 N/A
FKno FK Star Identifier in the FK N/A
star_name Name Name of the star N/A
CCDM CCDM Star Identifier in the CCDM-Catalogue N/A

Columns that are parts of indices are marked like this.


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Note F

For the expressions used to obtain the F-measures, see 1999A&A...346..675W ("Source" in the metadata).

mu0F is a proper motion derived from the FK5 and Hipparcos positions, mu0G is a proper motion derived from the GC and Hipparcos positions.