J/A+AS/92/449 Proper-motion of LTT stars (Wroblewski+ 1992)
New proper motion determination of Luyten catalogue stars (LTT) south
of declination -40 and right ascension between 04h30 and 16h00m
Wroblewski H., Torres C.
<Astron. Astrophys. Suppl. Ser. 92, 449 (1992)>
=1992A&AS...92..449W 1992A&AS...92..449W (SIMBAD/NED BibCode)
ADC_Keywords: Proper motions
Keywords: astrometry - proper motions
Abstract:
Data are given for 205 LTT stars found on 23 areas, covering 25 square
degrees each, south of declination -40D and right ascension between
04h 30m and 16h 00m. Four stars present differences in proper motion
≥0.10", three present differences in position angle >20deg and one
presents those differences in both values.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 90 205 Positions and relative proper motions
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See also:
I/98 : NLTT Catalogue (Luyten, 1979)
I/87 : LHS Catalogue, 2nd Edition (Luyten 1979)
J/A+AS/78/231 : Dec←40, 0<RA<4h30, stars 1 to 144 (Wroblewski+ 1989)
J/A+AS/91/129 : Dec←40, 0<RA<4h30, stars 145 to 521 (Wroblewski+ 1991)
J/A+AS/105/179 : Dec←40, 16<RA<24h, stars 522 to 1069 (Wroblewski+ 1994)
J/A+AS/115/481 : -30<Dec←5, 0<RA<9h, stars 1070 to 1563 (Wroblewski+ 1996)
J/A+AS/83/317 : LTT stars, Dec←40, 0<RA<4h30 (Wroblewski+ 1990)
J/A+AS/110/27 : LTT stars, Dec←40, 16<RA<24h (Wroblewski+, 1995)
J/A+AS/128/457 : LTT stars -5<Dec←30, 0<RA<13h30 (Wroblewski+ 1998)
J/A+AS/128/457 : LTT stars -5<DE←30, 0<RA<13h30 (Wroblewski+ 2000)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/205]+ Running number
5- 8 I4 --- LTT Star number in Luyten's catalogue
10- 16 A7 --- Loc Localisation (area and number)
18- 21 F4.1 mag mpg Photographic magnitude, accurate to 0.5mag
23- 24 I2 h RAh Right Ascension 1950 (hours)
26- 27 I2 min RAm Right Ascension 1950 (minutes)
29- 32 F4.1 s RAs Right Ascension 1950 (seconds)
34 A1 --- DE- Declination 1950 (sign)
35- 36 I2 deg DEd Declination 1950 (degrees)
38- 39 I2 arcmin DEm Declination 1950 (minutes)
41- 42 I2 arcsec DEs Declination 1950 (seconds)
44- 45 I2 h RA2000h Right Ascension 2000 (hours)
47- 48 I2 min RA2000m Right Ascension 2000 (minutes)
50- 53 F4.1 s RA2000s Right Ascension 2000 (seconds)
55 A1 --- DE2000- Declination 2000 (sign)
56- 57 I2 deg DE2000d Declination 2000 (degrees)
59- 60 I2 arcmin DE2000m Declination 2000 (minutes)
62- 63 I2 arcsec DE2000s Declination 2000 (seconds)
65- 69 F5.3 arcsec/yr pm Total proper motion
71- 75 F5.3 arcsec/yr e_pm Mean error on pm
77- 81 F5.1 deg pmPA Position angle (North to East) of the
proper motion in J2000 equinox
83- 87 F5.2 arcsec Dpm Difference LTT pm minus pm (this work) (1)
89- 90 A2 --- Remarks [1246]? Remarks (2)
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Note (1): It can be seen that most proper motions given in LTT are larger than
those determined by us. It is important to point out that stars
3 (LTT 2073), 22 (LTT 2681), 59 (LTT 3536), 179 (LTT 5731) and
196 (LTT 6127) show considerable differences (>0.10")
Note (2): '4' when proper-motion is the mean of 4 pairs of plates.
'6' when proper-motion is the mean of 6 pairs of plates.
'1' when LTT and present PA value differ by 20deg or more. Stars 6
(LTT 2214), 36 (LTT 2810), 151 (LTT 5365) and 179 (LTT 5731)
differ by 20deg or more.
The case of star 151 (LTT 5365) is remarkable because Luyten
estimates for it a position angle of 261deg, while our result
is 1.6deg.
'2' The star 90 (LTT 3915) was not found in the position given by
Luyten's Catalog but almost one degree south.
The star LTT 5582 was not found in our plates.
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History: Prepared via OCR at CDS.
References:
Luyten W.J. 1957, A Catalogue of 9867 Stars in the Southern Hemisphere
with Proper Motions Exceeding 0.2 arcsec Annualy (The Lund Press,
Minneapolis, Minnesota).
Luyten W.J. 1979, LHS Catalogue, University of Minnesota, Minneapolis,
Minnesota. (Cat. I/87)
(End) James Marcout, Patricia Bauer [CDS] 13-Mar-1997