J/A+AS/110/27 Proper motion of LTT stars (Wroblewski+, 1995)
New proper motion determination of Luyten catalogue stars (LTT) south of
declination -40deg and right ascension between 16h and 24h.
Wroblewski H., Torres C.
<Astron. Astrophys. Suppl. Ser. 110, 27 (1995)>
=1995A&AS..110...27W 1995A&AS..110...27W (SIMBAD/NED Reference)
ADC_Keywords: Proper motions
Keywords: astrometry - stars: kinematics
Description:
Data are given for 285 LTT stars found on 23 areas, covering 25 square
degrees each, south of declination -40deg and right ascension between
16h and 24h. Four stars present differences in proper motion greater
than 0.10 arcsec, eleven 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 89 285 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/92/449 : LTT stars, Dec←40, 4h30<RA<16h (Wroblewski+ 1992)
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 --- ID Correlative number
5- 8 I4 --- LTT Star number in Luyten's catalogue (LTT)
10- 16 A7 --- Location Location numbers where the first digits
refer to the area number and the other
refer to the star number in the area
18- 21 F4.1 mag Vmag V magnitude
23- 24 I2 h RAh Right ascension B1950.0
26- 27 I2 min RAm Right ascension B1950.0
29- 32 F4.1 s RAs Right ascension B1950.0
34 A1 --- DE- Declination sign
35- 36 I2 deg DEd Declination B1950.0
38- 39 I2 arcmin DEm Declination B1950.0
41- 42 I2 arcsec DEs Declination B1950.0
44- 45 I2 h RA2000h Right ascension J2000.0
47- 48 I2 min RA2000m Right ascension J2000.0
50- 53 F4.1 s RA2000s Right ascension J2000.0
55 A1 --- DE2000- Declination sign
56- 57 I2 deg DE2000d Declination J2000.0
59- 60 I2 arcmin DE2000m Declination J2000.0
62- 63 I2 arcsec DE2000s Declination J2000.0
65- 69 F5.3 arcsec/yr pm Annual proper motion (J2000.0)
71- 75 F5.3 arcsec/yr e_pm rms uncertainty on pm
77- 81 F5.1 deg pmPA Position angle (J2000.0) of proper motion
83- 87 F5.2 arcsec/yr Dpm Comparison of our proper motions with the LTT
proper motions in sense LTT minus ours.
89 A1 --- Remark [1246] Remarks (1)
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Note (1): The annual proper motions, and the position angles, given in
table1 are the means of the two values obtained from the plate pairs;
19 LTT stars were common to the overlapped areas mentioned above.
For them, the results given in table1 (indicated by 4 in column
Remark) correspond to the means of the values obtained from four
plate pairs. One proper-motion star is common to three overlapped
areas, for it the results given in the same table (indicated by 6
in column Remark) correspond to the mean of the values obtained from
six plate pairs.
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
121 (LTT 8146), 137 (LTT 8323), 146 (LTT 8382), 201 (LTT 8890) and
218 (LTT 8990) show considerable differences (>0.10").
On the other hand, stars 9 (LTT 6751), 37 (LTT 7432), 41 (LTT 7459),
59 (LTT 7572), 65 (LTT 7619), 105 (LTT 8034), 133 (LTT 8285),
137 (LTT 8323), 144 (LTT 8367), 194 (LTT 8859), 223 (LTT 9027) and
260 (LTT 9645) identified by (1) in column Remarks, show values of
position angles that differ by more than 20deg. It is also important
to note that the stars 27 (LTT 7391), 273 (LTT 9783)
and 276 (LTT 9792), indicated with (2) in column Remarks, were not
found in the position given by Luyten's Catalog. The stars LTT 7365,
LTT 7367, LTT 7371, LTT 7899, LTT 7973, LTT 8213 and LTT 8388 were
not found in our plates; from those stars LTT 7973 has the same name
(-51 12417) than LTT 7986. We could not resolve in our plates the
stars LTT 7510 and LTT 8855 from their companion stars LTT 7509 and
LTT 8854 respectively. The star LTT 9141 appear in our plates as
a double star.
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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) Patricia Bauer [CDS] 10-Nov-1994