J/AJ/130/2701 Stars in the Sagittarius Rift (Fresneau+, 2005)
Density wave streaming motions in stars along the Sagittarius spiral arm.
Fresneau A., Vaughan A.E., Argyle R.W.
<Astron. J., 130, 2701-2716 (2005)>
=2005AJ....130.2701F 2005AJ....130.2701F
ADC_Keywords: Surveys ; Positional data ; Proper motions ; Plate areas
Keywords: astronomical data bases: miscellaneous ; Galaxy: structure ;
stars: kinematics ; surveys
Abstract:
A magnitude-limited photographic survey of relative proper-motion
components and B, V photometry of 1.3x106 stars brighter than
apparent B magnitude 14.5±0.5 in the fourth Galactic quadrant is
converted into a distance-limited survey of 3.26x105 stars up to a
distance of 500pc. A streaming motion of 13.5±0.5 km/s is detected
in 4.1x104 Population I stellar candidates with an orbital
perigalactic center located at 6.8≤R≤7.2kpc, with a Sun location
Rsol=8.5 kpc. A density perturbation of about 0.1M☉/pc3 in the
Galactic field potential at Ro∼6.8kpc is interpreted as resulting from
the density wave connected with the Sagittarius-Carina spiral arm. A
set of 1.4x104 stars of mass about 1.5±0.75 M☉ identify a
pitch angle of 10±1° and a migration time from the Sagittarius
spiral arm into the greater solar neighborhood of about 35Myr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 56 291 Set of 291 SOAP Plates
plates/* . 291 Objects detected in each of the 291 plates
(total of 2026525 objects)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (B1900) of SOAP plate center
4- 5 I2 min RAm Right ascension (B1900) of SOAP plate center
7- 9 I3 deg DEdeg Declination (B1900) of SOAP plate center
12- 15 F4.2 arcsec sigT rms error of plate adjustment (1)
18- 24 F7.2 yr Epoch Observation date
27- 31 I5 --- N Number of objects detected (2)
34- 37 F4.2 10mas/yr sigMu Significant proper motion (3)
40- 43 F4.2 mag sigMag Significance level for B variability in B
magnitude between exposures on the same plate.
46- 56 A11 --- Plate Plate identification (file name, to be found
in the "plates" subdirectory)
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Note (1): adjustment with Tycho stars, gives also a quality of the plate
Note (2): number of objects detected simultaneously in the multiple-exposure
technique that was used to segregate stars from plate defects.
Note (3): centennial proper motion in arcseconds derived in the matching
process to stars in the GSC1.2 (Cat. I/254)
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Byte-by-byte Description of file: plates/*
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Bytes Format Units Label Explanations
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4- 5 I2 h RAh Right Ascension J2000 (hours) (1)
7- 8 I2 min RAm Right Ascension J2000 (minutes) (1)
10- 15 F6.3 s RAs Right Ascension J2000 (seconds) (1)
17- 20 F4.2 arcsec e_RAs Mean error on RA position (1)
22 A1 --- DE- Declination J2000 (sign) (1)
23- 24 I2 deg DEd Declination J2000 (degrees) (1)
26- 27 I2 arcmin DEm Declination J2000 (minutes) (1)
29- 33 F5.2 arcsec DEs Declination J2000 (seconds) (1)
35- 38 F4.2 arcsec e_DEs Mean error on Declination (1)
41- 47 F7.3 mm Xpos Plate X-coordinate (toward East) (2)
48- 52 F5.1 um e_Xpos Mean error (in microns) of Xpos
54- 60 F7.3 mm Ypos plate X-coordinate (toward South) (2)
61- 65 F5.1 um e_Ypos Mean error (in microns) of Ypos
67- 71 F5.2 mag Bmag Photographic B magnitude calibrated
through Tycho-2 (Cat. I/259)
74- 77 F4.2 mag e_Bmag Bmag scatter during the multi-exposure
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Note (1):
The RA, declination errors are derived in the adjustment to the GSC
1.2 (Cat. I/254) and are computed for Epoch indicated in file
"table3.dat".
Note (2):
The (x,y) coordinates are measured by the APM and are the first Epoch
data (indicated by column "Epoch" of Table 3) to be matched with any
other survey in order to estimate p.m. 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 1900) indicated in columns 1 and 2 of table3.
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History:
* 03-Feb-2006: from files originally stored at
ftp://cdsarc.u-strasbg/fr/incoming/fresneau/sydney
(End) Francois Ochsenbein, Alain Fresneau [CDS] 03-Feb-2006