J/MNRAS/395/907 PISCO speckle observations in 2007 (Prieur+, 2009)
Speckle observations with PISCO in Merate.
VII. Astrometric measurements of visual binaries in 2007.
Prieur J.-L., Scardia M., Pansecchi L., Argyle R.W., Sala M.
<Mon. Not. R. Astron. Soc., 395, 907-917 (2009)>
=2009MNRAS.395..907P 2009MNRAS.395..907P
ADC_Keywords: Stars, double and multiple ; Interferometry
Keywords: techniques: interferometric - astrometry - binaries: visual -
stars: individual (ADS 7871, ADS 7982, ADS 8128)
Abstract:
We present relative astrometric measurements of visual binaries made
during the first semester of 2007, with the Pupil Interferometry
Speckle camera and COronagraph (PISCO) at the 102-cm Zeiss telescope
of Brera Astronomical Observatory, in Merate. Our sample contains
orbital couples as well as binaries whose motion is still uncertain.
We obtained 226 new measurements of 214 objects, with angular
separations in the range 0.15-4.5arcsec, and an average accuracy of
0.013arcsec. The mean error on the position angles is. Most of the
position angles could be determined without the usual 180°
ambiguity with the application of triple-correlation techniques and/or
by inspection of the long integration files. We also present the new
orbits we have computed for ADS 7871, 7982 and 8128, for which our
measurements lead to large residuals and/or for which the revision is
justified by the significant number of observations made since the
publication of the previous orbit.
Description:
The observations were carried out with the PISCO speckle camera with
the ICCD (Intensified Charged Coupled Device) detector belonging to
Nice University (France). This instrumentation is presented in Prieur
et al. (1998, Exp. Astron., 8, 297) and our observing procedure is
described in detail in Paper VI (Scardia et al., 2009AN....330...55S 2009AN....330...55S).
For the present observations, thanks to an improvement of our software
and a faster computer, we were also able to compute in real time the
restricted triple correlation (Aristidi et al., 1997A&AS..125..139A 1997A&AS..125..139A),
used for resolving the 180° ambiguity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 242 Measurements of binaries with PISCO and residuals
with published orbits.
refs.dat 98 70 References
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See also:
J/MNRAS/367/1170 : PISCO speckle observations in 2004 (Scardia+, 2006)
J/AN/330/55 : PISCO speckle observations in 2006 (Scardia+, 2009)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS WDS designation (HHMMm+DDMM)
12- 26 A15 --- Name Usual name
28- 31 I4 --- ADS ?=- ADS number
33- 40 F8.3 yr Ep [2007.0/2007.4]?=- Epoch of observation
42 A1 --- Filt [RVW] Filter
44- 45 I2 mm f [10/20] Focal length of the eye-piece
used for magnifying the image
47- 51 F5.3 arcsec rho [0.15/4.5]?=- Angular separation ρ
53- 57 F5.3 arcsec e_rho [0.003/0.074]?=- rms uncertainty on rho
59- 63 F5.1 deg theta [0/360]?=- Position angle θ
64 A1 --- n_theta [*] * when θ could be determined
without the 180° ambiguity
67- 69 F3.1 deg e_theta [0.3/4]?=- rms uncertainty on θ
71- 77 A7 --- Notes Notes: "Diffuse", "Elong.", "Faint", "Noisy",
or "Unres."
79- 80 I2 --- Orb [1/70]? Orbit reference, in refs.dat file
82- 86 F5.2 arcsec Drho ? (O-C)ρ (2)
87 A1 --- u_Drho [)] Uncertainty flag on Drho
89- 94 F6.1 deg Dtheta ? (O-C)θ (2)
95 A1 --- n_Dtheta [)Q] Note on Dtheta (1)
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Note (1): Notes as follows:
Q = discrepant quadrants between our measurements and the published orbits
) = uncertainty flag
Note (2): Difference Observed value minus Computed value (from orbital
parameters)
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 51 A28 --- Aut Author's name
53- 98 A46 --- Com Comments
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History:
From electronic version of the journal
References:
Scardia et al., Paper I 2005MNRAS.357.1255S 2005MNRAS.357.1255S
Scardia et al., Paper II 2006MNRAS.367.1170S 2006MNRAS.367.1170S, Cat. J/MNRAS/367/1170
Scardia et al., Paper III 2007MNRAS.374..965S 2007MNRAS.374..965S
Scardia et al., Paper IV 2008AN....329...54S 2008AN....329...54S
Prieur et al., Paper V 2008MNRAS.387..772P 2008MNRAS.387..772P
Scardia et al., Paper VI 2009AN....330...55S 2009AN....330...55S, Cat. J/AN/330/55
Scardia et al., Paper VIII 2010AN....331..286S 2010AN....331..286S
Prieur et al., Paper IX 2010MNRAS.407.1913P 2010MNRAS.407.1913P
Prieur et al., Paper XI 2012MNRAS.422.1057P 2012MNRAS.422.1057P
Scardia et al., Paper XII 2013MNRAS.434.2803S 2013MNRAS.434.2803S
(End) Patricia Vannier [CDS] 08-Jul-2015