J/A+A/469/1221 Sydney observatory Galactic survey (SOGS) (Fresneau+, 2007)
Sydney observatory Galactic survey.
Potential for detection of extreme disk-crossing stars.
Fresneau A., Vaughan A.E., Argyle R.W.
<Astron. Astrophys. 469, 1221 (2007)>
=2007A&A...469.1221F 2007A&A...469.1221F
ADC_Keywords: Surveys ; Photometry, photographic
Keywords: surveys - stars: kinematics
Abstract:
First Epoch astrometric and radiometric information of a survey in the
optical along the Galactic fourth quadrant is archived for further
analysis in the time-domain.
A photographic survey of 1.9x106 stars down to B-magnitude
14.5±0.5 along the galactic meridian
l=(330±5)°,-64°<b←7° and along the galactic equator
272°<l<341°,-7°<b<7°, is provided from century old
astrographic plates of Sydney Observatory. Stellar candidates to
investigate the Galaxy disk kinematics up to a distance of 1kpc from
the Sun are tentatively selected.
A catalogue of 4.8x105 stars is provided for further investigation
of the galactic disk heating by transient spiral wave or by GMC
encounter.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 104 Set of 104 Sydney Obs. Astrograhic Plates (SOAP)
table2.dat 64 187 Set of 187 Northern Hemisphere astrographic plates
table3.dat 65 258 Set of 258 SOAP deep plates
ac/* . 104 Objects detected in each 104 plates (82124 objects)
misc/* . 187 Objects detected in each 187 plates (876987 objects)
merid/* . 258 Objects detected in each 258 plates (1869176 objects)
sogs/* . 14 Stars with 'high proper motion' in the 14 SOAP zones
(483190 objects)
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See also:
J/AJ/130/2701 : Stars in the Sagittarius Rift (Fresneau+, 2005)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (B1900) of plate center
4- 5 I2 min RAm Right Ascension (B1900) of plate center
7 A1 --- DE- Declination sign (B1900)
8- 9 I2 deg DEd Declination (B1900) of SOAP plate center
11- 14 F4.2 arcsec sigT ? rms. error of the plate adjustment (1)
16- 25 A10 "YYYY/MM/DD" Obs Date of observation
27- 31 I5 --- Nmeas Number of stars measured (2)
33- 37 I5 --- Nobs ? Number of stars observed (3)
39- 42 F4.2 10mas/yr sigMu ? Significant proper motion limit
in 0.01"/yr (4)
44- 47 F4.2 mag sigB ? Significant B-magnitude variability (5)
49- 65 A17 --- FileName FileName of the plate
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Note (1): Adjustment with Tycho-2 stars, gives also a quality of the plate
(tables 1 & 3)
Note (2): Number of objects detected simultaneously in the multiple-exposure
technique that was used to segregate stars from plate defects.
Note (3): Number of objects detected visually at the Epoch of the observation
(Nobs>Nmeas suggest a loss of plate contrast in the ageing of the
plate)
Note (4): Significant level in 0.01 arcsec/year for 'high proper motion'
candidates (tables 1 & 3)
Note (5): Significant level for B-magnitude variability between multiple
exposures in the plate (tables 1 & 3)
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Byte-by-byte Description of file: ac/* misc/* merid/*
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Bytes Format Units Label Explanations
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4- 5 I2 h RAh [0/24] Right Ascension J2000 (hours) (1)
7- 8 I2 min RAm Right Ascension J2000 (minutes) (1)
10- 15 F6.3 s RAs [0/60] Right Ascension J2000 (seconds) (1)
17- 20 F4.2 arcsec e_RAs ?=9.99 Mean error on RA position (1)
22 A1 --- DE- Declination sign J2000
23- 24 I2 deg DEd Declination J2000 (degrees) (1)
26- 27 I2 arcmin DEm Declination J2000 (minutes) (1)
29- 33 F5.2 arcsec DEs [0/60] Declination J2000 (seconds) (1)
35- 38 F4.2 arcsec e_DEs ?=9.99 Mean error on Declination (1)
41- 47 F7.3 mm Xpos Plate X-coordinate (toward East) (2)
48- 52 F5.1 um e_Xpos ?=0.0 Mean error (in microns) of Xpos
54- 60 F7.3 mm Ypos plate Y-coordinate (toward South) (2)
61- 65 F5.1 um e_Ypos ?=0.0 Mean error (in microns) of Ypos
67- 71 F5.2 mag Bmag Photographic B magnitude calibrated
through Tycho-2 (Cat. I/259)
73- 77 F5.2 mag e_Bmag ?=0.00 Bmag scatter during the multi-exposure
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Note (1): The right ascension, declination errors are derived in the
adjustment to the GSC1.2 (Cat. I/254) and are computed for Epoch
indicated in files "table1.dat" for ac/*.dat, "table2.dat" for
misc/*.dat and "table3.dat" for merid/*.dat
Note (2): The (x,y) coordinates are measured by the APM and are the
first Epoch data (indicated by column "Epoch" of Tables 1,2 and 3)
to be matched with any other survey in order to estimate proper motion
components. We assume that the (x,y) coordinates represent a gnomonic
projection of the celestial sphere over a field-of-view of 2 by 2
arcdegrees, centered on the R.A. and declination (Equinox and Equator
1900) indicated in columns 1, 2 and 3 of tables 1, 2 and 3.
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Byte-by-byte Description of file: sogs/*
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Bytes Format Units Label Explanations
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4- 8 F5.2 mag Vmag V magnitude
10- 14 F5.2 mag Bmag B magnitude
18- 19 I2 h RAh Right ascension (J2000, epoch is 1980 approx.)
21- 22 I2 min RAm Right ascension (J2000)
24- 28 F5.2 s RAs [0/60] Right ascension (J2000)
31 A1 --- DE- Declination sign (J2000)
32- 33 I2 deg DEd Declination (J2000, epoch is 1980 approx.)
35- 36 I2 arcmin DEm Declination (J2000)
38- 41 F4.1 arcsec DEs [0/60] Declination (J2000)
44- 50 F7.4 arcsec/yr pmRA Proper motion component in right ascension
51- 57 F7.4 arcsec/yr pmDE Proper motion component in declination
60- 64 F5.2 mas plx Statistical parallax (1)
67- 71 F5.2 mas e_plx Statistical parallax error (1)
74- 78 F5.2 --- prob [0,1] probability for extreme disk (2)
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Note (1): The statistical parallax and its error in 0.001arcsec are
computed from the Reduced Proper Motion Diagramm and the total
proper motion error and apparent magnitude error.
Note (2): The probability to qualify for extreme disk crossing star
is computed from the inclination of the velocity vector in a
meridional cross-section of the Galaxy.
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Acknowledgements:
Alain Fresneau, fresneau(at)astro.u-strasbg.fr
(End) Alain Fresneau [Obs. Strasbourg], Patricia Vannier [CDS] 07-May-2007