III/70 Luyten's White Dwarf Catalogues (Luyten, 1970-77)
White Dwarfs Luyten W.J. <Univ. of Minnesota, Minneapolis (1970)> White Dwarfs II Luyten W.J. <Univ. of Minnesota, Minneapolis (1977)>
ADC_Keywords: Stars, white dwarf; Proper motions Description: The catalogue includes all probable white dwarf and degenerate stars found in the Proper Motion and Faint Blue Star Surveys conducted by W.J. Luyten. The catalogue was originally published in two booklets, one in 1970 (3035 entries), and the part II in 1977 (3511 entries). As a guideline for the inclusion of stars into this catalogue, the author has used stars which present minimal values of the combined proper motions - magnitude quantity H defined by H = m + 5 + 5 log µ (µ is the proper motion in arcsec/yr) which show the minimal H values according to the color class: b 13.5 f 15.5 g-k 17.7 a 14.4 g 17.0 k 18.3 with the following exceptions: a) evidence from photoelectric colors or spectra indicate the object is a degenerate star (e.g. LB 3303) or b) the object is close to the antapex (which is the case for many stars at alpha=21h and delta =+42°, plate 234). The bluest stars (color classes b or a) will probably prove to be genuine white dwarfs; probably no more than 40% of the yellower objects (color class k) will prove to be genuine degenerates. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 80 6546 The Combined Catalogue remarks.dat 80 602 Remarks to flagged stars
Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq [1/6546]+ Sequential number 6- 14 A9 --- LP *Luyten Proper Motion designation 15 A1 --- Rem [*] indicates a remark in the "remarks" file 17- 27 A11 --- Name Other Name of the white dwarf 29- 30 I2 h RAh Right Ascension 1950 (hours) 32- 33 I2 min RAm Right Ascension 1950 (minutes) 35- 36 I2 s RAs Right Ascension 1950 (seconds) 38 A1 --- DE- Declination 1950 (sign) 39- 40 I2 deg DEd Declination 1950 (degrees) 42- 45 F4.1 arcmin DEm Declination 1950 (minutes) 47- 50 F4.1 mag Rmag *?=99.9 Red magnitude 52 A1 --- l_Pmag *[>] Limit flag on Pmag 53- 56 F4.1 mag Pmag Photographic magnitude 57 A1 --- u_Pmag Uncertainty flag (:) on Pmag 59- 61 A3 --- spClass [ DAobafgkm-] Spectral or color class 62 A1 --- u_spClass Uncertainty flag (:) on Color class 64- 68 F5.3 arcsec/yr pm *Total proper motion 70- 72 I3 deg pmPA *[0,360[ Direction of the proper motion 73 A1 --- u_pmPA Uncertainty flag (:) on pmPA 75- 78 I4 --- vSeq *Sequence number within each volume 80 I1 --- vNo [1,2] Volume number
Note on LP: the number is made of the Palomar Sky Survey (PSS) plate number, followed by a dash and a running number of the star within the PSS plate area. For close stars, the number may be followed by a letter (a, b or B) Note on Rmag: the first white dwarf catalogue did not contain any value for the red magnitude so a dummy value of 99.9 has been added for all entries from the first catalogue. Note on l_Pmag: When objects are near the magnitude limit a plus ('+') sign was given in the published catalogue in lieu of a value (e.g. LP 544-28 and LP 544-29 from the second volume of white dwarfs). For these cases a greater than sign ('>') is given in this byte, otherwise blank. Note on pm, pmPA: The direction of the proper motion is measured from North Eastwards. The RA and Dec components are: pmRA.cos(Dec) = pm * sin(pmPA) and pmDec = pm * cos(pmPA) Note on vSeq, vNo: vNo indicates the volume (1 or 2) from which the entry was originally published; the vSeq number ranges from 1 to 3035 for volume 1, and from 1 to 3511 for volume 2.
Byte-by-byte Description of file: remarks.dat
Bytes Format Units Label Explanations
1- 4 I4 --- vSeq Sequence number within given volume (1) 6 I1 --- vNo [1,2] Volume of white dwarfs (1) 7 A1 --- --- [:] (1) 8- 16 A9 --- Name Name of the star (LP when no acronym) (1) 18- 80 A63 --- Text Text of remark
Note (1): bytes 1-16 are repeated in consecutive records when the note is longer than 63 characters.
History: * April 1980 (from Theresa A. Nagy and Robert S. Hill, Systems and Applied Sciences Corporation for NASA): All of the data were keypunched, proofread and written onto magnetic tape at the Goddard Space Flight Center. Volume I has 2934 entries, according to its introduction; 99 entries were added after the introduction had gone to press, making 3033 entries. However, the keypunching, proofreading, and computer checking yielded 3035 entries. All entries were sorted according to right ascension, though in the published version, the added group of 99 entries is separate. White Dwarfs II has 3513 entries, according to its introduction. However, the keypunching, proofreading, and computer checking yielded 3511 entries. Sequence (vSeq) and volume number (vNo) were added to each entry. The format of the entries from the Volume 1 was altered to make it like the Volume 2: tenths of minute in RA were converted to seconds, and a zero was inserted as tenth of arcminute in declination. Two entries were altered: a) LP 322-897 (vNo=2, vSeq=1966) with RA reported as 13 08.4 was converted to 13 08 24 b) BD-07 3632 (vNo=2, vSeq=2056) with RA reported as 13 27.40 was converted to 13 27 40 * 21-Dec-1999 (Francois Ochsenbein, CDS, Strasbourg) Two further errors were corrected: => LP 234-1664 (vNo=1, vSeq=2705) had a proper motion of 0.1arcsec with an angle of 955 degrees; the values were corrected to 0.21 arcsec and 95 degrees, according to the proper motion survey => LP 587-9 (vNo=2, vSeq=288) indicates a proper motion angle of 412 degrees; its value was changed to 142 degrees, to be consistent with LP. The secondary names included in the remarks were added in the "Name" column when possible, and the documentation was added.
(End) Francois Ochsenbein [CDS] 21-Dec-1999
|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|