J/AJ/138/813 Speckle interferometry at Mount Wilson Obs. (Hartkopf+, 2009)
Speckle interferometry at Mount Wilson Observatory: observations obtained
in 2006-2007 and 35 new orbits.
Hartkopf W.I., Mason B.D.
<Astron. J., 138, 813-826 (2009)>
=2009AJ....138..813H 2009AJ....138..813H
ADC_Keywords: Stars, double and multiple ; Interferometry
Keywords: binaries: general - binaries: visual - techniques: interferometric
Abstract:
Results are presented for 607 speckle interferometric observations of
double stars, as well as 222 measures of single stars or unresolved
pairs. All data were obtained in 2006 and 2007 at the Mount Wilson
Observatory, using the 2.5 m Hooker telescope. Separations range from
0.06" to 6.31", with a median of 0.34". These three observing runs
concentrated on binaries in need of confirmation (mainly Hipparcos and
Tycho pairs), as well as systems in need of improved orbital elements.
New orbital solutions have been determined for 35 systems as a result.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 651 Speckle Interferometric Measurements
table2.dat 77 223 Unresolved objects
refs.dat 114 188 References
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WDS WDS designation (Cat. B/wds) (1)
12- 19 A8 --- Disc Discoverer designation
21- 25 A5 --- Comp System components
27- 35 F9.4 yr Epoch ? Epoch of Observation (Besselian year)
37- 41 F5.1 deg PA ? Position angle
42 A1 --- u_PA Uncertainty flag on PA
44- 48 F5.3 arcsec Sep ? Separation
49 A1 --- u_Sep Uncertainty flag on Sep
51 A1 --- Filt [Vgy ] Filter used in observation (G2)
53- 57 F5.1 deg (O-C)PA ? The O-C position angle residual
59- 64 F6.3 arcsec (O-C)Sep ? The O-C separation residual
66- 73 A8 --- Ref Orbit reference, see file "refs.dat"
75 I1 --- Grade ? Orbit grade (3)
77- 79 A3 --- Note Note(s) (4)
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Note (1): Based on arcminute-precision J2000 coordinates.
Note (3): See Sixth Orbit Catalog for more details on orbit grading.
1 = "definitive"
2 = "good"
3 = "reliable"
4 = "preliminary"
5 = "indeterminate"
Note (4): Notes as follows:
C = Confirming observation (only one published measure in WDS).
d = Large difference in θ (>30 degrees) and/or ρ (>30%)
compared with last published observation or orbit ephemeris.
q = Quadrant was flipped by 180 degrees for the new orbit relative
to the published one.
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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 --- WDS WDS designation (1)
12- 21 A10 --- Disc Discoverer designation/Hipparcos number (2)
23- 27 A5 --- Comp System components
29- 37 F9.4 yr Epoch ? Epoch of Observation (Besselian year)
39- 41 A3 --- Filt [Vgy, ] Filter used in observation (G2)
43- 68 A26 --- Note Additional note (4)
70- 77 A8 --- Ref Reference, see text
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Note (1): Based on arcminute-precision J2000 coordinates.
Note (2): This columns gives either the Discoverer designation for known pairs
now unresolved or the Hipparcos number for apparently single stars.
Note (4): Notes as follows:
C = Pair is either too close to resolve or is near the Rayleigh limit at
this epoch; last published separation or separation predicted by orbit
in parentheses.
M = Magnitude difference is too large; Δm in parentheses
S = Star is single; i.e., has never been resolved into components;
other names in parentheses.
U = Duplicity is unconfirmed; discovery date and separation in parentheses.
W = Observed star is one component of a wide pair; other names, including
discoverer designation and component, in parentheses.
? = Reason for nonresolution unknown; last published separation or
separation predicted by orbit in parentheses.
1 = Balega et al. (2002AstL...28..773B 2002AstL...28..773B) orbit predicts a separation
of 0.055" in mid-2006, opening rapidly to 0.197" at this epoch.
Perhaps T0 is not quite correct?
2 = Observed 20 times 1982-1998 and resolved 4 times 1983-1989, with
separations decreasing from 0.236" to 0.160". Motion indicates a
∼40-year period orbit.
3 = Observed 3 times 1987-1991 (with all observations noted as weak),
then unresolved until a 2002 (0.24") measure at 900nm.
4 = Observed 7 times 1985-1998, then resolved at 0.22" in 1988
(note: "uncertain"), unresolved in 2002 (3.6m AO), and finally
resolved at 0.41" in late 2003.
5 = Four observations 1991-1996, with separation decreasing from 0.15"
to 0.06"; next observed in 2004 at 0.16". Two possible orbits are
suggested: a short-period (11.3y) solution predicts a separation
of 0.074", while a long-period (28.8y) solution predicts 0.143".
6 = Observed by CHARA 17 times 1987-1998 and resolved once (1987.26,
0.259", note: "uncertain whether real"). Later resolved by the USNO
26 in (2006.31, 0.40").
7 = Resolved 3 times 1980-1994, but unresolved ∼35 times 1980-1998.
Published astrometric orbits (HIP1997b, Jan2005) give a period of
∼1.3y and an inclination near 90 degrees.
8 = Resolved in 1984 and 1994 at ∼0.46" but at 0.09" in 1999;
unresolved ∼20 times 1983-1997.
9 = Resolved at 0.041" in 1977 and 0.047" in 1981; unresolved 20 times
1976-1991.
10 = Resolved at 0.29" in 1985 and 0.20" in 1989; unresolved 15 times
1986-1997.
11 = Resolved at 0.17" in 1985 and 0.15" in 1989; unresolved 15 times
1986-1997.
12 = Resolved 3 times 1986-1991 at separations 0.16"-0.19" separations,
but unresolved by Balega at the 6-m in 1997 and 10 times 1985-1997
at 4m and 2.5m telescopes.
13 = Soederhjelm (1999, Cat. J/A+A/341/121) orbit predicts a separation
of 0.734", but the magnitude difference (published value 2.7mag)
may have been too great.
14 = Heintz (1996AJ....111..412H 1996AJ....111..412H) orbit predicts a separation of 0.374";
however, the secondary may have been too faint for the CHARA camera.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Ref Reference code
10- 28 A19 --- BibCode BibCode
30- 50 A21 --- Aut Author's name
52-114 A63 --- Com Comments
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Global notes:
Note (G2): Filter characteristics as follows:
y = Stromgren y (λeff=550nm, FWHM=24nm)
g = USNO g (λeff=560nm, FWHM=45nm)
V = Johnson V (λeff=545nm, FWHM=85nm)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jan-2012