J/ApJ/729/L5 The revised orbit of the δ Sco system (Tycner+, 2011)
The revised orbit of the δ Sco system.
Tycner C., Ames A., Zavala R.T., Hummel C.A., Benson J.A., Hutter D.J.
<Astrophys. J., 729, L5 (2011)>
=2011ApJ...729L...5T 2011ApJ...729L...5T
ADC_Keywords: Interferometry ; Positional data ; Stars, nearby ;
Stars, double and multiple
Keywords: techniques: interferometric
Abstract:
In anticipation of the possible collision between a circumstellar disk
and the secondary star in the highly eccentric binary system δ
Scorpii, high angular resolution interferometric observations have
been acquired, aimed at revising the binary parameters. The Navy
Prototype Optical Interferometer was used to spatially resolve the
binary components in 2000 and over a period between 2005 and 2010. The
interferometric observations are used to obtain the angular
separations and orientations of the two stellar components at all
epochs for which data have been obtained, including 2005 and 2006, for
which, based on previous studies, there was some uncertainty as to if
the signature of binarity can be clearly detected. The results of this
study represent the most complete and accurate coverage of the binary
orbit of this system to date and allow for the revised timing of the
upcoming periastron passage that will occur in 2011 to be obtained.
Description:
The interferometric data used in this study have been acquired using
the Navy Prototype Optical Interferometer (NPOI) on two nights in 2000
July (shortly before the last periastron passage) and with the rest
obtained over 94 nights between 2005 June and 2010 August. The
interferometric observations obtained during our δ Sco campaign
have utilized all six operational stations resulting in baseline
lengths from 18 to 80m.
Objects:
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RA (2000) DE Designation(s) (Period [year])
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16 00 20.01 -22 37 18.1 * del Sco = HD 143275 (P=10.817)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 96 NPOI (Navy Prototype Optical Interferometer)
astrometric results
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See also:
I/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008)
I/270 : Catalog of Positions of IR Stellar Sources (CPIRSS) (Hindsley+ 1994)
V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996)
I/193 : Positions and Proper Motions - South (Bastian+ 1993)
J/A+A/408/305 : Spectroscopic observations of delta Sco (Miroshnichenko+, 2003)
J/A+A/386/492 : High Angular Resolution Measurements (Richichi, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 "YYYY/MMM/DD" Date UT date of the observation
13- 21 F9.4 yr Year Decimal year of observation
23- 28 F6.2 mas Sep Separation
30- 35 F6.2 deg PA Position angle; north through east
37- 41 F5.3 mas amaj Semi-major axis of error ellipse
43- 47 F5.3 mas bmin Semi-minor axis of error ellipse
49- 53 F5.1 deg PAe Position angle of error ellipse
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Sep-2012