J/MNRAS/481/5307 OPD's first speckle interferometric measures (Guerrero+, 2018)
First speckle interferometric measurements at the Observatorio do Pico dos Dias
of the Laboratorio Nacional de Astrofisica.
Guerrero C.A., Souza T.B., Campos R.P., Borges Fernandes M.,
Campagnolo J.C.N.
<Mon. Not. R. Astron. Soc., 481, 5307-5314 (2018)>
=2018MNRAS.481.5307G 2018MNRAS.481.5307G (SIMBAD/NED BibCode)
ADC_Keywords: Interferometry ; Stars, double and multiple
Keywords: techniques: high angular resolution - techniques: interferometric -
binaries: close - binaries: visual
Abstract:
In this paper we present the first speckle interferometric
measurements of binary stars performed at the Observatorio do Pico
dos Dias of the Laboratorio Nacional de Astrofisica in Brazil, using
the 1.60m Perkin-Elmer telescope. In order to carry out these
observations, we had to perform an opto-mechanical modification to
Camera 1 of the 1.6 m to meet the specifications of the observational
programme. We focused our efforts on objects from the Washington
Double Star Catalogue that were obtained during four observing runs
allocated in 2017 and 2018. Among these objects, we have been
interested in performing a follow-up observation of double stars
discovered by the Hipparcos mission. We report here 464 astrometric
measurements of 139 pairs, with angular separations ranging from 0.09
to 6.36arcsec, including 361 systems with separations smaller than
1arcsec. We estimated a mean error in separation of 15mas and 1.2deg
in position angle. We confirmed 15 double stars discovered by
Hipparcos, as well as four new pairs observed in previously known
binaries turning them into triple systems, three of which have
separations smaller than 0.16arcsec. With these observations we
introduce a new instrument to the astronomical community available at
the Observatorio do Pico dos Dias, capable of identifying relatively
bright binaries, with angular separation very close to the resolution
power of the telescope.
Description:
We carried out our observations during four seasons, allocated in 2017
and 2018 at the 1.60m P&E telescope of the OPD/LNA. The 1.60m P&E
telescope is the main telescope at the OPD/LNA, and the largest
telescope in operation in Brazil. It started operations in April of
1980. The optical design of the 1.60m is of Ritchey-Chretien type. It
has a focal ratio in the Cassegrain focus of f/10, but it can also be
operated on the Coude focus with a ratio f/31.2. This telescope is
mainly used for direct imaging, photometry, polarimetry and
spectroscopy.
Our sample selection consisted mostly of stars with separations
shorter than 1arcsec, observable from the OPD-LNA, near the zenith.
The last observations for most of the visual binaries in our sample
were more than 20 years ago. According to our standard observing
procedure, for each star we register three sets of fits-cubes,
containing 1000 images of 20ms of exposure time each - one for each
filter V, R and I. Once we have the fits-cubes, the data reduction
follows a standard process.
In Table 3, we list the main body of our astrometric measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 95 461 Multi-band astrometry of known pairs observed
with the 1.60m telescope
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Epoch J2000 coordinates in the format used by
the WDS (HHMMm+DDMM)
12 A1 --- f_Name Flag on Name (1)
14- 25 A12 --- OName Discoverer designation
27- 33 F7.4 yr Epoch Epoch of the observation in fractional
Besselian years Ep-2000
35- 39 F5.1 deg PA Position angle
41- 43 F3.1 deg e_PA Error on PA
45- 48 F4.2 arcsec Sep Angular separation
50- 53 F4.2 arcsec e_Sep Error on Sep
55- 59 F5.2 deg DPA ? Difference between our observed position
angle and the ephemeris calculated for the
date of observation
61- 65 F5.2 arcsec DSep ? Difference between our observed angular
separation and the ephemeris calculated for
the date of observation
67- 91 A25 --- Ref ? Reference for the publications in which the
orbital elements can be found (2)
93- 95 I3 nm Lambda Central wavelength for each particular
detection
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Note (1): Flag as follows:
C = Ambiguous quadrant from reconstructed image. Quadrant adopted from the
latest measure in the WDS
H = Confirmed Hipparcos double star
T = Confirmed Tycho double star
Note (2): References as follows:
Tokovinin et al. (2015) = Tokovinin et al. (2015AJ....150...50T 2015AJ....150...50T,
Cat. J/AJ/150/50)
Hartkopf & Mason (2010) = Hartkopf, W. I., Mason, B. D., & Worley, C. E.
2001, AJ, 122, 3472, Sixth Catalog of Orbits of
Visual Binary Stars, US Naval Observatory,
Washington.
Andrade (2007) = Andrade (2007RMxAA..43..237A 2007RMxAA..43..237A)
Soderhjelm (1999) = Soderhjelm (1999A&A...341..121S 1999A&A...341..121S)
Muterspaugh et al. (2010) = Muterspaugh et al. (2010AJ....140.1623M 2010AJ....140.1623M,
Cat. J/AJ/140/1623)
Tokovinin et al. (2014) = Tokovinin et al. (2014AJ....147..123T 2014AJ....147..123T,
Cat. J/AJ/147/123)
Rica (2012) = Rica (2012JDSO....8..127R 2012JDSO....8..127R)
Zirm (2010) = Zirm, H. & Rica, F. M. 2010, IAU Commission on
Double Stars, 170, 1
Docobo & Campo (2013) = Docobo, J. A. & Campo, P. 2012, IAU Commission on
Double Stars, 176, 1
Seymour et al. (2002) = Seymour et al. (2002AJ....123.1023S 2002AJ....123.1023S,
Cat. J/AJ/123/1023)
Zirm (2008) = Zirm (2008IAUDS.166....1Z 2008IAUDS.166....1Z)
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History:
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(End) Ana Fiallos [CDS] 16-Jun-2022