J/A+A/426/367 FBS blue stellar objects DSS1/DSS2 astrometry (Mickaelian, 2004)
DSS1/DSS2 astrometry for 1101 First Byurakan Survey blue stellar objects:
accurate positions and other results.
Mickaelian A.M.
<Astron. Astrophys. 426, 367 (2004)>
=2004A&A...426..367M 2004A&A...426..367M
ADC_Keywords: Blue objects ; Positional data
Keywords: astrometry - blue stellar objects - proper motions
Abstract:
Accurate measurements of the positions of 1103 First Byurakan Survey
(FBS) blue stellar objects (the Second part of the FBS, II/223) have
been carried out on the DSS1 and DSS2 (red and blue images). To
establish the accuracy of the DSS1 and DSS2, measurements have been
made for 153 AGN for which absolute VLBI coordinates have been
published. The rms errors are: 0.45" for DSS1, 0.33" for DSS2 red, and
0.59" for DSS2 blue in each coordinate, the corresponding total
positional errors being 0.64", 0.46", and 0.83", respectively. The
highest accuracy (0.42") is obtained by weighted averaging of the DSS1
and DSS2 red positions. It is shown that by using all three DSS images
accidental errors can be significantly reduced. The comparison of DSS2
and DSS1 images made it possible to reveal positional differences and
proper motions for 78 objects (for 62 of these for the first time),
including new high-probability candidate white dwarfs, and to find
objects showing strong variability, i.e. high-probability candidate
cataclysmic variables.
Description:
For each object, DSS1 and DSS2(red) positions, DSS2(red)-DSS1 and
DSS2(red)-DSS2(blue) differences, and comments on proper motions,
binarity, variability, and extension are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 1103 Accurate DSS1 and DSS2 positions for 1103 FBS
Blue Stellar Objects
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See also:
II/223 : First Byurakan Survey (FBS), 2nd Program (Abrahamian et al., 1990-96)
J/other/Ap/42.1 : FBS Blue stellar objects (Mickaelian+, 1999)
J/other/Ap/46.46 : FBS Blue stellar objects. XII (Abrahamyan+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq FBS object publication number, Cat. II/223
7- 15 A9 --- FBS FBS object name (from position)
17- 18 I2 h RAh DSS1 right ascension (J2000.0)
20- 21 I2 min RAm DSS1 right ascension (J2000.0)
23- 27 F5.2 s RAs DSS1 right ascension (J2000.0)
30 A1 --- DE- DSS1 declination sign (J2000.0)
31- 32 I2 deg DEd DSS1 declination (J2000.0)
34- 35 I2 arcmin DEm DSS1 declination (J2000.0)
37- 40 F4.1 arcsec DEs DSS1 declination (J2000.0)
42 A1 --- C1 [C] "C" for cursor measurement
44- 45 I2 h RA2h DSS2(red) right ascension (J2000)
47- 48 I2 min RA2m DSS2(red) right ascension (J2000)
50- 54 F5.2 s RA2s DSS2(red) right ascension (J2000)
57 A1 --- DE2- DSS2(red) declination sign
58- 59 I2 deg DE2d DSS2(red) declination (J2000)
61- 62 I2 arcmin DE2m DSS2(red) declination (J2000)
64- 67 F4.1 arcsec DE2s DSS2(red) declination (J2000)
69 A1 --- C2 [C] "C" for cursor measurement
71- 74 F4.1 arcsec ORA(r2-1) DSS2(red)-DSS1 difference
76- 79 F4.1 arcsec ORA(r2-b2) DSS2(red)-DSS2(blue) difference
82-110 A29 --- Comments Additional information obtained from the
measurements (1)
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Note (1): The informations are abbreviated as follows:
PM: proper motion
bin: binary image
gal: extended image
PN: planetary nebula
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Acknowledgements: Areg Mickaelian <aregmick(at)apaven.am>
(End) Areg Mickaelian [BAO, Armenia], Patricia Vannier [CDS] 06-Sep-2004