WDS BIBLE COLUMN Format DATA -------- ------ ---------------------------- 1 - 10 A10 2000 Coordinates 11 - 17 A7 Discoverer & Number 18 - 22 A5 Components 24 - 27 I4 Date (first) 29 - 32 I4 Date (last) 34 - 37 I4 Number of Observations (up to 9999) 39 - 41 I3 Position Angle (first - XXX) 43 - 45 I3 Position Angle (last - XXX) 47 - 51 F5.1 Separation (first) 53 - 57 F5.1 Separation (last) 59 - 63 F5.2 Magnitude of First Component 65 - 69 F5.2 Magnitude of Second Component 71 - 79 A9 Spectral Type (Primary/Secondary) 81 - 84 I4 Primary Proper Motion (RA) 85 - 88 I4 Primary Proper Motion (Dec) 90 - 93 I4 Secondary Proper Motion (RA) 94 - 97 I4 Secondary Proper Motion (Dec) 99 - 106 A8 Durchmusterung Number 108 - 111 A4 Notes 113 - 130 A18 2000 arcsecond coordinates Description of Data in the WDS Columns 1- 10: The hours, minutes, and tenths of minutes of Right Ascension for 2000, followed by the degrees and minutes of Declination for 2000, with + and - indicating north and south declinations. The positions given represent our best estimates of these values. Where possible, these are based on the ACRS and PPM data, with proper motion incorporated. Columns 11- 17: The discoverer, identified by his one-to-three letter code, and his discoverer's number, if assigned. The reference list should be consulted first to identify individuals. However, some discoverer designations do not appear in this list, for various reasons, and a supplementary list is provided. Columns 18- 22: Components, when the object has more than two. The Lick IDS scheme has been discontinued, and components are now referred to by the traditionally employed lower-case letters. The rather awkward upper-case designations, e.g. ABXC, have been changed to the form AB-C, etc. We have noted some confusion on the part of observers and students alike, as to how to designate components in multiple systems. Traditionally, these have been designated in order of separation, thus AB, AC,...., or in the cases where close pairs are observed blended, AB-C, AB-D,.... In some instances, differing resolution limits produce situations where observations are intermixed, thus AC, AB-C, and so forth (in all too many cases, carelessness on the part of the observer does not permit us to determine with certainty how the observation is to be interpreted). There are also many instances where later observations have revealed a closer companion; these are designated Aa, Bb, etc. In a few cases wider, later discoveries have also been so denoted. Columns 24- 27: The dates of the first and last observations of an object 29- 32: (of satisfactory accuracy), up to the present date. Columns 34- 37: The number of measures of the object. Columns 39- 41: Position angles in degrees for the dates listed in columns 43- 45: 26-34. Crude positions (e.g., NP) of the past have been changed to their degree equivalent with an accompanying note in the data line of the measurement database. Position angles are unprecessed in this catalog (i.e., they are for the mean date of observation). Columns 47- 51: The distances in seconds of arc, and tenths, for the dates 53- 57: listed in columns 26-34. Some separations are treated by the codes found in columns 100-101, or in the Notes. Columns 59- 63: Magnitudes of the two components. See the Introduction for 65- 69: discussion. Columns 71- 79: Spectral type of A, or of two components, if space permits. See the Introduction for discussion. Columns 81- 84: The components of the proper motion in seconds of arc per 85- 88: 1000 years, in right ascension reduced to great circle, and in declination. Specifically, this catalog lists 15mu(alpha) cos(delta), where mu(alpha) is in seconds of time, and mu(delta) is in seconds of arc. Both quantities are reduced to a time unit of 1000 years. The exceptions are those objects coded P for which an explanation is given under the description for Columns 108 to 111. + and - indicate eastward and westward motions in Right Ascension, and + and - those north and south in Declination. Where possible, this comes from Tycho-2. Columns 90- 93: Proper motion of the secondary, when known. 94- 97: Columns 99-106: Durchmusterung number of the object in the system used by the Henry Draper Catalogue: Bonn from +89 degrees to -22 degrees inclusive, Cordoba from -23 degrees to -51 degrees inclusive, Cape Photographic from -52 degrees to -89 degrees inclusive. When a star is not contained in the Durchmusterung proper to its declination zone, but is contained in another Durchmusterung, this is so indicated in the Notes. Other components having different Durchmusterung numbers are also indicated in the Notes. Columns 108-111: The following codes are contained in these columns: N: Notes found in the Notes table. B: Summary line gives blue (Johnson U or B, blue photographic, etc.) magnitudes C: Orbit and Linear solution. A published orbit exists and this system has a Linear Solution as well. A "C" code, then, indicates both an "O" and an "L" code. I: Identification uncertain. Match of object at precise position with WDS pair may or may not be correct. Currently under examination. K: Summary line gives K-band or other infrared (>1 micron) magnitudes L: Linear solution. Linear elements for this pair have been determined. Linear Elements Catalog is currently under devlopement. M: Magnitude modified. Magnitudes have been corrected to the Tycho-V scale based on other systems measured by the discoverer and Tycho. N: Notes found in WDSNOT MEMO of WDS O: Orbit, briefly described in WDSNOT MEMO and has entry in Orbit Catalog P: 100-year proper motion in right ascension and declination R: Summary line gives red (Johnson R or I, red photographic, etc.) magnitudes S: Statistically different parallax and proper motion indicates that this pair is non-physical. T: Statistically the same parallax within the errors and similar proper motion or other technique indicates that this pair is physical. U: Proper motion or other technique indicates that this pair is non-physical. V: Proper motion or other technique indicates that this pair is physical. W: System has additional components and/or measures in the WDS Supplement (WDSS) catalog. X: A "Dubious Double" (or "Bogus Binary"). This pair may represent a positional typo in the original publication (so we're looking in the wrong location), an optical double disappearing due to radically different proper motions, a plate flaw, or simply a pair not at a magnitude, separation, etc., sufficiently similar to those noted when the first measure was added (making it too faint, too close, etc.). We would certainly like to know about any circumstances where you have found or have ascertained the mystery behind these pairs. Y: Statistically different parallax for the components indicates they are non-physical. Z: Statistically the same parallax within the errors would indicate the components are physical. At present, column 108 is reserved for N, column 109 for O, L, C, or X and column 110 for W. The other codes can occur in any column. Columns 113-130: The hours, minutes, seconds and tenths of seconds (when known) of Right Ascension for 2000, followed by the degrees, minutes, and seconds of Declination for 2000, with + and - indicating north and south declinations. The positions given represent our best estimates of these values. Where possible, these are based on the Hipparcos and Tycho data, with proper motion incorporated. While the arcminute coordinate (columns 1-10) refer to the primary of a multiple system, the arcsecond coordinate (columns 113-130) refer to the primary of the subsystem. For example, while the BC pair of an A-BC multiple will have the same 10 digit WDS coordinate, the arcsecond coordinate of the BC pair will be at the "B" position.