J/MNRAS/495/806 Speckle measurements of binaries at the OAGH (Guerrero+, 2020)
First speckle interferometric measurements of binary stars at the Observatorio
Astrofisico Guillermo Haro.
Guerrero C.A., Rosales-Ortega F.F., Escobedo G., Martinez J., Castillo E.,
Garcia-Flores P., Nieto-Suarez M.A.
<Mon. Not. R. Astron. Soc., 495, 806-815 (2020)>
=2020MNRAS.495..806G 2020MNRAS.495..806G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Binaries, orbits ; Milky Way ;
Interferometry ; Optical
Keywords: methods: observational - techniques: high angular resolution -
techniques: interferometric - binaries: close - binaries: visual
Abstract:
In this paper, we present the first multiband speckle interferometric
measurements of binary stars performed using the 2.1m telescope of the
Observatorio Astrofisico Guillermo Haro, Cananea, Sonora, Mexico. We
describe here FICCO: Fast Imaging Camera for Cananea Observatory, a
new instrument developed to perform speckle observations from the
Northern Hemisphere. We tested this new instrument with objects from
the Washington Double Star Catalog, that were observed during three
runs allocated in 2019. We report 480 astrometric measurements of 138
pairs, with angular separations ranging from 0.06 to 5.76arcsec,
including 347 measurements with separations smaller than 1arcsec. We
estimated a mean error in separation of 14mas, 1.6° in position
angle, and 0.45mag for the magnitude difference. We confirmed 12
double stars discovered by Hipparcos. Finally, we present a correction
to four previously published orbital solutions of visual binaries.
Description:
The 2.1m Ritchey-Chretien telescope of the OAGH is the largest
telescope in operation at the site. It has a focal ratio in the
Cassegrain focus of f/12. The diffraction-limited resolution of the
telescope for the V,R, and I filters is 0.053arcsec for λ=538nm
with FWHM=120nm, 0.067arcsec for λ=630nm with FWHM=70nm and
0.088 for λ=894nm, with FWHM=306nm. The telescope has a Direct
Camera instrument, enabling observations with spatial resolution of
0.2arcsec, and it is equipped with a filter wheel, which is capable of
holding up to 11 filters at a time.
Our observations were distributed in three seasons allocated in 2019.
We limited our sample to stars mostly with separations less than
1arcsec, observable from the OAGH. For many of this double stars, the
last observation occurred more than 20yr ago. Following our observing
procedure, we register three sets of fits-cubes for each star - one
for each filter V, R, and I - containing 1000 images of 20ms of
exposure time. The data reduction then follows a standard process,
described in detail in Guerrero et al. (2018MNRAS.475.1725G 2018MNRAS.475.1725G, Cat.
J/MNRAS/475/1725).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 138 14 Astrometric ephemeris and residuals for
calibration stars
table3.dat 143 476 Multiband astrometry of known pairs observed
with the 2.1m telescope
table4.dat 154 4 Orbital elements
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name (HHMM+DDMM)
12- 20 A9 --- OName Alternative name (discoverer designation)
22- 27 F6.4 yr Epoch Epoch of the observation in fractional Julian
years (Epoch+2000)
29- 33 F5.1 deg PA Position angle
35- 37 F3.1 deg e_PA ? Error on PA
39- 42 F4.2 arcsec rho Angular separation
44- 47 F4.2 arcsec e_rho ? Error on rho
49- 52 F4.1 deg DPA Residual of the mean values of the observed
position angle compared with the ephemeris
calculated for the time of observation
54- 56 F3.1 deg e_DPA ? Error on DPA
58- 62 F5.2 arcsec Drho Residual of the mean values of the observed
angular separation compared with the ephemeris
calculated for the time of observation
64- 67 F4.2 arcsec e_Drho ? Error on Drho
69 I1 --- Grade [1/2] Orbit quality grade (1)
71- 138 A68 --- Ref Reference
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Note (1): Orbit grade according to the Sixth Catalog of Orbits of Visual Binary
Stars (http://www.astro.gsu.edu/wds/orb6.html) as follows:
1 = Definitive. Well-distributed coverage exceeding one revolution; no
revisions expected except for minor adjustments
2 = Good. Most of a revolution, well observed, with sufficient curvature to
give considerable confidence in the derived elements. No major changes
in the elements likely
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name (HHMM+DDMM)
12 A1 --- f_Name [HC*] Flag on Name (1)
14- 25 A12 --- OName Alternative name
27- 32 F6.4 yr Epoch Epoch of the observation in fractional Julian
years (Epoch+2000)
34- 38 F5.1 deg PA ? Positional angle
40- 42 F3.1 deg e_PA ? Error on PA
44- 47 F4.2 arcsec rho ? Angular separation
49- 52 F4.2 arcsec e_rho ? Error on rho
54- 57 F4.2 mag Dm ? Magnitude difference of the stars
59- 64 F6.2 deg DPA ? Residuals of the mean observed position
angle compared with the calculated ephemeris
of the stars listed in Table 2
66- 70 F5.2 arcsec Drho ? Residuals of the mean observed angular
separation compared with the calculated
ephemeris of the stars listed in Table 2
72- 139 A68 --- Ref Reference
141- 143 I3 nm lambda Central wavelength
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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
* = New pair detected in a previously known binary
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name (HHMM+DDMM)
12- 19 A8 --- OName Alternative name
21- 25 F5.1 yr Porb Orbital period
27- 30 F4.2 yr e_Porb Error on Porb
32- 38 F7.2 yr T0 Epoch of periastron
40- 43 F4.2 yr e_T0 Error on T0
45- 49 F5.3 --- e Eccentricity
51- 55 F5.3 --- e_e Error on e
57- 61 F5.3 arcsec a Semimajor axis
63- 67 F5.3 arcsec e_a Error on a
69- 73 F5.1 deg Omega Longitude of the node for the J2000.0 equinox
75- 77 F3.1 deg e_Omega Error on Omega
79- 83 F5.1 deg omega Longitude of periastron
85- 87 F3.1 deg e_omega Error on omega
89- 93 F5.1 deg i Inclination angle
95- 97 F3.1 deg e_i Error on i
99- 154 A56 --- Ref Reference of the previous orbit
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 07-Jun-2023