J/AJ/98/1693 UBVRI photometry of NLTT stars (Ryan 1989)
Subdwarf studies. I. UBVRI photometry of NLTT stars.
Ryan S.G.
<Astron. J. 98, 1693 (1989)>
=1989AJ.....98.1693R 1989AJ.....98.1693R
ADC_Keywords: Photometry, UBVRI ; Stars, subdwarf ; Stars, high-velocity
Description:
UBVRI photometry is presented for a sample of 1656 southern stars,
including 1211, that were previously not measured, drawn from the NLTT
(Luyten, 1979; catalogue I/98) proper-motion catalog; the catalog is
shown to be a rich source of subdwarfs. The normalized UV excess,
d(U-B)0.6, photometric parallax, and interstellar reddening are
calculated for each star when possible. Residuals between the
photometry and the magnitudes published in the NLTT catalog indicate
that the latter have a large scatter (∼0.6mag) and therefore the
values tabulated in the NLTT catalog must be regarded as approximate
only.
The erratum (Astron. J. 99, 1336) which deals with position angles
of proper motions (pmPA) has been taken into account.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 123 1428 Observed photometry and derived parameters
table4.dat 123 442 Photometry from literature and derived parameters
notes.dat 112 51 Notes on individual stars
anotes.dat 110 54 Additional notes added in August 2017
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See also:
I/98 : Luyten's NLTT Catalog
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name of the star, as in NLTT (G1)
13- 14 I2 h RAh Right Ascension 1950 (hours), Epoch=1950
15- 16 I2 min RAm Right Ascension 1950 (minutes)
17- 18 I2 s RAs Right Ascension 1950 (seconds)
20 A1 --- DE- Declination 1950 (sign)
21- 22 I2 deg DEd Declination 1950 (degrees)
23- 24 I2 arcmin DEm Declination 1950 (minutes)
25- 26 I2 arcsec DEs Declination 1950 (seconds)
29- 34 F6.3 arcsec/yr pm Annual total proper motion (G2)
36- 38 I3 deg pmPA Position angle of proper motion (G2)
43- 47 F5.2 mag Vmag ? Magnitude in UBV system
48- 52 F5.2 mag B-V ? colour index
54- 58 F5.2 mag U-B ? colour index
59- 63 F5.2 mag d(U-B).6 ? Normalized ultraviolet excess (2)
64- 68 F5.2 mag V-R ? colour index
70- 74 F5.2 mag R-Ic ? colour index (I in Cousins)
76- 77 I2 --- N ? Number of observations
78 A1 --- f_N [AC] Ambiguity / Contamination note (3)
80- 83 I4 pc Dist [10/1025]? Photometric heliocentric distance
84 A1 --- u_Dist Uncertainty flag (:) on Dist
86- 89 F4.2 mag E(B-V) ? Derived colour excess
90 A1 --- u_E(B-V) Uncertainty flag (:) on E(B-V)
91- 95 F5.2 mag d(U-B) ? De-reddened normalized ultraviolet excess
99 A1 --- t4 [*] '*' when the star is also in table4
101-102 A2 --- NT [NT ] Note/Trigonometric parallax note (4)
105-123 A19 --- ANames Alternate designations of the star
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Note (2): Colour excess as defined in Sandage (1969ApJ...158.1115S 1969ApJ...158.1115S)
Note (3): Ambiguity/Contamination note (only when N is blank) as follows:
A = denotes 36 stars that could not be unambiguously identified
from the coordinates or photometric data
C = denotes 22 stars with visible close companions that would
have contaminated photometry.
Note (4): this note has the following meaning:
N = when a note exists at the end of the published table
T = when a trigonometric parallax is listed in the published Table 7
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name of the star, as in NLTT (G1)
13- 14 I2 h RAh Right Ascension 1950 (hours), Epoch=1950
15- 16 I2 min RAm Right Ascension 1950 (minutes)
17- 18 I2 s RAs Right Ascension 1950 (seconds)
20 A1 --- DE- Declination 1950 (sign)
21- 22 I2 deg DEd Declination 1950 (degrees)
23- 24 I2 arcmin DEm Declination 1950 (minutes)
25- 26 I2 arcsec DEs Declination 1950 (seconds)
29- 34 F6.3 arcsec/yr pm Annual total proper motion (G2)
36- 38 I3 deg pmPA Position angle of proper motion (G2)
43- 47 F5.2 mag Vmag ? Magnitude of UBV system
48- 52 F5.2 mag B-V ? colour index
54- 58 F5.2 mag U-B ? colour index
59- 63 F5.2 mag d(U-B).6 ? Normalized ultraviolet excess (2)
64- 67 F4.2 mag R-Ic ? colour index (I transformed from Kron to
Cousins)
70- 77 A8 --- Ref Reference of the Photometry (3)
80- 83 I4 pc Dist [10/361]? Photometric heliocentric distance
84 A1 --- u_Dist Uncertainty flag (:) on Dist
86- 89 F4.2 mag E(B-V) ? Derived colour excess
90 A1 --- u_E(B-V) Uncertainty flag (:) on E(B-V)
91- 95 F5.2 mag d(U-B) ? De-reddened normalized ultraviolet excess
99-102 A4 --- Note [*SDBNT? ] Note (4)
105-123 A19 --- ANames Alternate designations of the star
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Note (2): Colour excess as defined in Sandage (1969ApJ...158.1115S 1969ApJ...158.1115S)
Note (3): References are as follows:
CL = Carney & Latham (1987AJ.....93..116C 1987AJ.....93..116C)
E1 = Eggen O.J. (1979ApJS...39...89E 1979ApJS...39...89E)
E2 = Eggen O.J. (1980ApJS...43..457E 1980ApJS...43..457E)
E3 = Eggen O.J. (1987AJ.....93..379E 1987AJ.....93..379E)
SF = Sandage & Fouts (1987AJ.....93...74S 1987AJ.....93...74S)
SK = Sandage & Kowal (1986AJ.....91.1140S 1986AJ.....91.1140S)
S2 = Sandage (1969ApJ...158.1115S 1969ApJ...158.1115S)
Note (4): this note has the following meaning:
* = the star is also in table3
N = a note exists at the end of the published table
T = a trigonometric parallax is listed in the published Table 7
S? = suspected binary
SB = probable binary
DB = double-lined system
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Byte-by-byte Description of file: notes.dat anotes.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Name of the star, as in NLTT
13- 14 I2 h RAh Right Ascension 1950 (hours), Epoch=1950
15- 16 I2 min RAm Right Ascension 1950 (minutes)
17- 18 I2 s RAs Right Ascension 1950 (seconds)
20 A1 --- DE- Declination 1950 (sign)
21- 22 I2 deg DEd Declination 1950 (degrees)
23- 24 I2 arcmin DEm Declination 1950 (minutes)
25- 26 I2 arcsec DEs Declination 1950 (seconds)
29-112 A84 --- Text Text of note; the prefix G: indices a note
from LPMS (Luyten's Proper Motion Survey)
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Global Notes:
Note (G1): Identifiers without prefixes are DM (Bonner and Cordoba
Durchmusterungen, written with a colon), or Luyten numbers from the
Bruce Proper Motion Survey (L numbers) or the Luyten-Palomar Survey
(LP numbers), the former in zones -45 to -89 deg and the latter in
zones +89 to -44 deg. Other miscellaneous identifiers (Oxf = Oxford AC,
Grw = Greenwich AC; U = Upgren; R = Ross, etc...).
An asterisk (*) in the identification field indicates that a note
exists in the "remarks" file of the NLTT (I/98) catalog.
Note (G2): The total proper motion is reported. The RA/DE proper
motions can be computed with the formulae
pmRA = pm.sin(pmPA)
pmDE = pm.cos(pmPA)
History:
Thanks are due to Heinz J. Andernach for contacting the author, who
agreed to forward the electronic tables to CDS on 01-Dec-1995.
The notes have been typed by J. Marcout [CDS]
Three other errors have been corrected in August 2017 in table3:
* -22:10366 (#838) has Dec=-223606, is written -221606 (20' error)
* 630-178 (#1114) has Dec=+001830, is written -001830 (sign error)
* -73:1474 (#1272) is actually CD-74 1474 (error in NLTT, where
moreover RA=19:48:42 instead of 21:48:42)
Additional notes in the course of identification of the stars observed
in August 2017 are included in the file "anotes.dat"
Courtesy:
Sean Ryan, Anglo-Australian Observatory SGR(at)aaoepp2.aao.gov.au
(End) Francois Ochsenbein [CDS] 29-Aug-2017