J/AJ/150/151 DSSI observations of binaries. VI. Measures in 2014 (Horch+, 2015)
Observations of binary stars with the Differential Speckle Survey Instrument.
VI. Measures during 2014 at the Discovery Channel Telescope.
Horch E.P., Van Belle G.T., Davidson J.W.JR, Ciastko L.A., Everett M.E.,
Bjorkman K.S.
<Astron. J., 150, 151 (2015)>
=2015AJ....150..151H 2015AJ....150..151H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Photometry
Keywords: astrometry - binaries: visual - techniques: interferometric -
techniques: photometric
Abstract:
We present the results of 938 speckle measures of double stars and
suspected double stars drawn mainly from the Hipparcos Catalog, as
well as 208 observations where no companion was noted. One hundred
fourteen pairs have been resolved for the first time. The data were
obtained during four observing runs in 2014 using the Differential
Speckle Survey Instrument at Lowell Observatory's Discovery Channel
Telescope. The measurement precision obtained when comparing to
ephemeris positions of binaries with very well-known orbits is
generally less than 2mas in separation and 0.5° in position angle.
Differential photometry is found to have internal precision of
approximately 0.1mag and to be in very good agreement with Hipparcos
measures in cases where the comparison is most relevant. We also
estimate the detection limit in the cases where no companion was
found. Visual orbital elements are derived for six systems.
Description:
We have started a new program of speckle observations of double stars
at Lowell Observatory's Discovery Channel Telescope (DCT), a 4.3-m
telescope.
The Differential Speckle Survey Instrument (DSSI) was on the telescope
on four occasions during 2014: two nights in March, two in June, eight
nights from September 30 to October 7, and four more in November for a
total of 16 nights, of which approximately five were used for binary
star observations reported here. In Table3, we present our measures of
double stars.
There are a number of binaries observed that have orbits of relatively
high quality in the Sixth Catalog of Visual Orbits of Binary Stars
(Hartkopf et al., 2001AJ....122.3472H 2001AJ....122.3472H) that were not used in the
determination of the scale. We may use these to further judge the
intrinsic accuracy and precision of the measures in Table3. A listing
of these objects is given in Table4, together with the orbit
information.
We also estimate the detection limit at 0.2'' in the cases where no
companion was found (see Table5).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 83 944 Discovery Channel Telescope (DCT) double star
speckle measures
table4.dat 128 36 Ephemeris positions and residuals used in the
astrometric accuracy study
table5.dat 166 104 High-quality nondetections and 5σ detection
limits
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/AJ/143/10 : WIYN speckle observations of binaries. VII. (Horch+, 2012)
J/AJ/141/45 : Speckel observations of HIP stars (Horch+, 2011)
J/AJ/139/205 : 2007-2008 WIYN speckle observations of binaries (Horch+, 2010)
J/AJ/136/312 : 2001-2006 WIYN binary stars speckle observations (Horch+, 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star catalog designation
(HHMMm+DDMM, J2000)
12- 22 A11 --- OName Other identifier (HR, ADS, HD, or DM)
24- 36 A13 --- Disc Discoverer designation and component(s)
38- 43 I6 --- HIP [96/118054]? Hipparcos number
45- 53 F9.4 yr Date [2014.2/2014.9] Besselian date of observation
55- 59 F5.1 deg PA [0.8/359.8]? Position angle (θ) (1)
61- 66 F6.4 arcsec Sep [0.009/1.2]? Separation of pair (ρ)
68- 71 F4.2 mag Dmag [0/5.39]? Magnitude difference of pair in filter
used
73- 75 I3 nm lambda [692/880] Center wavelength of filter used
λ
77- 78 I2 nm FWHM [40/50] Full-Width at Half-Maximum of filter used
(Δλ)
80- 83 A4 --- f_FWHM Flag for quadrant problem, or other remark (2)
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Note (1): Of the secondary star relative to the primary, with North through
East defining the positive sense.
Note (2): Flag defined as follows:
a = Quadrant ambiguous;
b = Quadrant inconsistent with previous measures in the 4th Interferometric
Catalog of Hartkopf et al. (2001AJ....122.3480H 2001AJ....122.3480H);
c = Third component noted, but above 1.2arcsec;
d = This object was used in the determination of the pixel scale and
detector orientation, so only the magnitude difference measure is
reported here.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star catalog designation
(HHMMm+DDMM, J2000)
12- 23 A12 --- Disc Discoverer designation and component(s)
25- 30 I6 --- HIP [981/117761] Hipparcos number
32- 40 F9.4 yr Date [2014.2/2014.8] Besselian date of observation
42- 46 F5.1 deg PA [0.3/341.8] Position Angle (θ)
48- 52 F5.2 deg e_PA [0.02/15.1] Error in PA
54- 59 F6.4 arcsec Sep [0.012/1.12] Separation (ρ)
61- 66 F6.4 arcsec e_Sep [0.0001/0.05] Error in Sep
68- 73 A6 deg (O-C)t The position angle residual (Δθ)
75- 81 A7 arcsec (O-C)r The separation residual (Δρ)
83-126 A44 --- Ref Orbit reference
128 A1 --- f_Ref [a] Flag on Ref (a=separation not used) (1)
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Note (1): Although the separation uncertainty meets the criteria discussed in
the text, this object will probably need an orbit refinement after passing
through periastron, as discussed in Horch et al. (2015AJ....149..151H 2015AJ....149..151H), so
we have not used the separations here. This does not affect the position
angles, as it is an edge-on system.
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WDS Washington Double Star catalog designation
(HHMMm+DDMM, J2000)
12- 17 I6 --- HIP [7141/110672]? Hipparcos number
19- 27 F9.4 yr Date [2014.2/2014.9] Besselian date of observation
29- 32 F4.2 mag Dl692 [2.79/4.71] The 5σ detection limit at 0.2''
in the 692nm filter (1)
34- 37 F4.2 mag Dl880 [2.48/4.48] The 5σ detection limit at 0.2''
in the 880nm filter (1)
39-166 A128 --- Note Notes (2)
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Note (1): The 0.2'' value is just above the "knee" in the curve, which gives a
good reference point for the rest of the curve.
Note (2): If previous observations are mentioned, these are drawn from the 4th
Interferometric Catalog of Binary Stars (Hartkopf et al.,
2001AJ....122.3480H 2001AJ....122.3480H).
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History:
From electronic version of the journal
References:
Horch et al., Paper I 2009AJ....137.5057H 2009AJ....137.5057H
Horch et al., Paper II 2011AJ....141...45H 2011AJ....141...45H, Cat. J/AJ/141/45
Horch et al., Paper III 2011AJ....141..180H 2011AJ....141..180H
Horch et al., Paper IV 2012AJ....144..165H 2012AJ....144..165H
Horch et al., Paper V 2015AJ....149..151H 2015AJ....149..151H
Horch et al., Paper VII 2017AJ....153..212H 2017AJ....153..212H, Cat. J/AJ/153/212
Horch et al., Paper VIII 2019AJ....157...56H 2019AJ....157...56H
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 18-Apr-2016