Information on Service 'Delta-mu Binaries'

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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 service's resource, see Information on resource 'Delta-mu Binaries'

Service 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).

Overview

You can access this service using:

This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
fmax F_max Maximum of F-measures reported N/A pos.pm;arith.diff;stat.fit.goodness
hipno HIP# Catalog number in Hipparcos catalog N/A meta.id;meta.main
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
SR Search Radius Search radius deg N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
comp Component Component for resolved binaries N/A meta.code
dej2000 Dec(2000) Declination from Hipparcos deg pos.eq.dec;meta.main
f0f F_0F F-measure for proper motions from FK5 vs. mu0F Note F N/A pos.pm;arith.diff;stat.fit.goodness
f0gch F_0GCH F-measure for proper motions from Hipparcos vs. mu0G Note F N/A pos.pm;arith.diff;stat.fit.goodness
f0h F_0H F-measure for proper motions from Hipparcos vs. mu0F Note F N/A pos.pm;arith.diff;stat.fit.goodness
ffh F_FH F-Measure for proper motions FK5 vs. Hipparcos Note F N/A pos.pm;arith.diff;stat.fit.goodness
ft2h F_T2H F-measure for proper motions from Hipparcos vs. Tycho-2 Note F N/A pos.pm;arith.diff;stat.fit.goodness
hipno HIP# Catalog number in Hipparcos catalog N/A meta.id;meta.main
mv m_V Visual magnitude mag phot.mag;em.opt.V
raj2000 RA(2000) Right ascension from Hipparcos deg pos.eq.ra;meta.main

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
raj2000 RA(2000) Right ascension from Hipparcos deg pos.eq.ra;meta.main 1
dej2000 Dec(2000) Declination from Hipparcos deg pos.eq.dec;meta.main 1
hipno HIP# Catalog number in Hipparcos catalog N/A meta.id;meta.main 9
_r Dist. Distance to cone center deg pos.distance 10
comp Component Component for resolved binaries N/A meta.code 15
ffh F_FH F-Measure for proper motions FK5 vs. Hipparcos Note F N/A pos.pm;arith.diff;stat.fit.goodness 15
f0f F_0F F-measure for proper motions from FK5 vs. mu0F Note F N/A pos.pm;arith.diff;stat.fit.goodness 15
f0h F_0H F-measure for proper motions from Hipparcos vs. mu0F Note F N/A pos.pm;arith.diff;stat.fit.goodness 15
f0gch F_0GCH F-measure for proper motions from Hipparcos vs. mu0G Note F N/A pos.pm;arith.diff;stat.fit.goodness 15
ft2h F_T2H F-measure for proper motions from Hipparcos vs. Tycho-2 Note F N/A pos.pm;arith.diff;stat.fit.goodness 15
mv m_V Visual magnitude mag phot.mag;em.opt.V 19
color B-V Color index B-V, Hipparcos V magnitude mag phot.color;em.opt.B;em.opt.V 22
parallax Parallax Parallax from Hipparcos mas pos.parallax.trig 22
FK FK FK Part the star was found in N/A meta.id;meta.ref 25
GC GC Star Identifier in the GC N/A meta.id 25
T2 T2 Object is in Tycho-2 N/A meta.id;meta.ref 25
HD HD Star Identifier in the HD-Catalogue N/A meta.id 25
HR HR Star Identifier in the HR-Catalogue N/A meta.id 25
CNS4 CNS4 Star Identifier in CNS4 N/A meta.id 25
FKno FK Star Identifier in the FK N/A meta.id 25
star_name Name Name of the star N/A meta.id 25
CCDM CCDM Star Identifier in the CCDM-Catalogue N/A meta.id 25
fmax F_max Maximum of F-measures reported Note F N/A pos.pm;arith.diff;stat.fit.goodness 30

VOResource XML (that's something exclusively for VO nerds)

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.