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Further access options are discussed below
For a list of all services and tables belonging to this service's resource, see Information on resource 'Delta-mu Binaries'
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).
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2000 2000
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.
The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):
| Name | Table Head | Description | Unit | UCD |
|---|---|---|---|---|
| DEC | Delta (ICRS) | Declination (ICRS decimal) | deg | pos.eq.dec |
| fmax | F_max | Maximum of F-measures reported | N/A | stat.fit.goodness;pos.pm;arith.diff |
| 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 |
| maxrec | Match limit | Maximum number of records returned. Pass 0 to retrieve service parameters. | N/A | N/A |
| RA | Alpha (ICRS) | Right Ascension (ICRS decimal) | deg | pos.eq.ra |
| responseformat | Output Format | File format requested for output. | N/A | meta.code.mime |
| SR | Search Radius | Search radius | deg | N/A |
| verb | Verbosity | Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. | N/A | N/A |
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.
| Name | Table Head | Description | Unit | UCD |
|---|---|---|---|---|
| _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 | stat.fit.goodness;pos.pm;arith.diff |
| f0gch | F_0GCH | F-measure for proper motions from Hipparcos vs. mu0G Note F | N/A | stat.fit.goodness;pos.pm;arith.diff |
| f0h | F_0H | F-measure for proper motions from Hipparcos vs. mu0F Note F | N/A | stat.fit.goodness;pos.pm;arith.diff |
| ffh | F_FH | F-Measure for proper motions FK5 vs. Hipparcos Note F | N/A | stat.fit.goodness;pos.pm;arith.diff |
| ft2h | F_T2H | F-measure for proper motions from Hipparcos vs. Tycho-2 Note F | N/A | stat.fit.goodness;pos.pm;arith.diff |
| 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 |
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.
| Name | Table Head | Description | Unit | UCD | 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 | stat.fit.goodness;pos.pm;arith.diff | 15 |
| f0f | F_0F | F-measure for proper motions from FK5 vs. mu0F Note F | N/A | stat.fit.goodness;pos.pm;arith.diff | 15 |
| f0h | F_0H | F-measure for proper motions from Hipparcos vs. mu0F Note F | N/A | stat.fit.goodness;pos.pm;arith.diff | 15 |
| f0gch | F_0GCH | F-measure for proper motions from Hipparcos vs. mu0G Note F | N/A | stat.fit.goodness;pos.pm;arith.diff | 15 |
| ft2h | F_T2H | F-measure for proper motions from Hipparcos vs. Tycho-2 Note F | N/A | stat.fit.goodness;pos.pm;arith.diff | 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.ref | 25 |
| GC | GC | Star Identifier in the GC | N/A | meta.id.cross | 25 |
| T2 | T2 | Object is in Tycho-2 | N/A | meta.code | 25 |
| HD | HD | Star Identifier in the HD-Catalogue | N/A | meta.id.cross | 25 |
| HR | HR | Star Identifier in the HR-Catalogue | N/A | meta.id.cross | 25 |
| CNS4 | CNS4 | Star Identifier in CNS4 | N/A | meta.id.cross | 25 |
| FKno | FK | Star Identifier in the FK | N/A | meta.id.cross | 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.cross | 25 |
| fmax | F_max | Maximum of F-measures reported Note F | N/A | stat.fit.goodness;pos.pm;arith.diff | 30 |
VOResource XML (that's something exclusively for VO nerds)
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.
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