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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
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:
FileName Lrecl Records Explanations
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 112 54 Additional notes added in August 2017
See also: I/98 : Luyten's NLTT Catalog Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
Note (2): Colour excess as defined in Sandage (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
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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
Note (2): Colour excess as defined in Sandage (1969ApJ...158.1115S) Note (3): References are as follows: CL = Carney & Latham (1987AJ.....93..116C) E1 = Eggen O.J. (1979ApJS...39...89E) E2 = Eggen O.J. (1980ApJS...43..457E) E3 = Eggen O.J. (1987AJ.....93..379E) SF = Sandage & Fouts (1987AJ.....93...74S) SK = Sandage & Kowal (1986AJ.....91.1140S) S2 = Sandage (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
Byte-by-byte Description of file: notes.dat anotes.dat
Bytes Format Units Label Explanations
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)
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
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

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