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J/A+A/380/238     Long-period companions of multiple stars       (Shatsky, 2001)

The long-period companions of multiple stars tend to have moderate eccentricities Shatsky N. <Astron. Astrophys. 380, 238 (2001)> =2001A&A...380..238S
ADC_Keywords: Stars, double and multiple Keywords: binaries: visual - stars: statistics; formation Description: We examined the statistics of an angle gamma between the radius vector of a visual companion of a multiple star and the vector of its apparent relative motion in the system. We found that for the wide physical subsystems of the 174 objects from the Multiple Star Catalogue (MSC, Cat. J/A+AS/124/75) gamma is bell-shaped. Table 1 presents the separation and position angle of visual outer companions of the sample multiples, and the relative motion (since discovery) and its direction - angle gamma with its error. Positions are taken for the first epoch mostly from Washington Double Star catalogue (WDS, Cat. I/237) and from Hipparcos (Cat. I/239) or Tycho (Cat. I/239 and I/259) catalogues for the second epoch. Orbital motion in inner subsystems of multiple stars is taken into account in gamma when significant. Table 2 gives the cross-identification of objects and components in different catalogues. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 39 174 Position parameters and angles gamma table2.dat 90 174 Objects cross-identification
See also: I/237 : The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996) I/211 : CCDM (Components of Double and Multiple stars) (Dommanget+ 1994) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/A+AS/124/75 : Multiple star catalogue (MSC) (Tokovinin 1997-1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- WDS Object ID in WDS (Cat. <I/237>) (G1) 12- 13 A2 --- Comp Components designations in MSC, Cat. J/A+AS/124/75 15- 19 F5.1 arcsec Sep Separation from primary for second epoch 21- 23 I3 deg PA Position angle for second epoch 25- 27 I3 deg gamma [0-360[ gamma-angle for second epoch 29- 30 I2 deg e_gamma [2-30[ error of gamma 32- 35 F4.1 arcsec delta [0-15] motion - relative position change (2) 37- 39 A3 --- Note [cw*123moOxX]? Note (3)
Note (2): Motion is equal to the difference of proper motion of companions multiplied by epoch difference, i.e. it is a relative shift of the secondary component during the history of observations. Note (3): Note on origin of position parameters and details of gamma calculation: c = first epoch Sep,PA are taken from CCDM (Cat. I/211) rather than from WDS (Cat. I/237) w = second epoch position is taken from WDS (Cat. I/237) (no HIP or Tycho id) * = one of the alternative Hipparcos solutions is accepted 1,2,3 = Hipparcos or Tycho photocenter positions are computed for primary, secondary or both subsystems of the object, respectively m = Tycho-II proper motion difference is used to compute gamma instead of Sep, PA-change. O,o = position parameters are corrected for orbital motion in primary, secondary subsystems of the object X,x = uncertainty from unpredictable motion in primary, secondary subsystem is taken into account in e_gamma
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- WDS Object ID in WDS (Cat. <I/237>) (G1) 12- 21 A10 --- IDS Object ID in Index Catalogue IDS (1963IDS...C......0J) (2) 23- 24 A2 --- Comp Components designations in MSC, Cat. J/A+AS/124/75 26- 30 A5 --- m_WDS ? Components desig. in WDS (3) 32- 41 A10 --- CCDM ? Object ID in CCDM (Cat. <I/211>) (4) 43- 44 A2 --- m_CCDM ? Components designations in CCDM 46- 51 I6 --- HIP1 ? HIP (Cat. I/239) number of primary component 53- 58 I6 --- HIP2 ? HIP (Cat. I/239) number of secondary (empty if HIP2=HIP1) 60- 61 A2 --- m_HIP1 ? Components designations in DMSA/C (5) 63- 74 A12 --- TYCHO1 ? Tycho identifier of primary 76- 87 A12 --- TYCHO2 ? Tycho identifier of secondary 89- 90 A2 --- r_TYCHO1 [ 12]? Tycho version (<I/239>) or <I/259>) for TYCHO1 and TYCHO2 (6)
Note (2): Index Double Star catalogue identification: also approximate coordinates in the same form as for WDS (Cat. I/237) but for equinox 1900.0 Note (3): Multiple visual systems are denoted as AB-C or AB-CD in WDS (Cat. I/237) when position parameters are given there with respect to corresponding (visual) photocenters of subsystems Note (4): CCDM (Cat. I/211) identification (when available) differs sometimes from WDS (Cat. I/237) due to round-off errors in produced object identifier Note (5): Component identifiers as given in Component Solutions of the Double and Multiple Star Annex of Hipparcos Catalogue (Cat. I/239) in case of a single HIP-number for both components in question Note (6): Position code of a reference of TYCHO1 and TYCHO2 fields: first symbol gives a reference for primary component, second symbol for secondary. 1 = Tycho Catalogue (1997, Cat. I/239) 2 = Tycho-2 Catalogue (2000, Cat. I/259)
Global notes: Note (G1): Identification of the multiple star in WDS (Cat. I/237) represents approximate equatorial coordinates of object for equinox 2000.0 in format: [HHMMMsDDMM], where HH is RAh, MMM is RAm with decimal minutes, s is a declination sign, DD is DEd, MM is DEm.
Acknowledgements: N. Shatsky
(End) N. Shatsky [Sternberg Institute] 05-Oct-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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