J/AJ/165/180 SOAR Speckle Survey, nearby hierarchical systems (Tokovinin, 2023)
Exploring Thousands of Nearby Hierarchical Systems with Gaia and Speckle
Interferometry.
Tokovinin A.
<Astron. J., 165, 180 (2023)>
=2023AJ....165..180T 2023AJ....165..180T
ADC_Keywords: Stars, double and multiple; Photometry, RI; Interferometry;
Keywords: Binary stars ; Multiple stars ; Solar neighborhood ; Speckle
interferometry
Abstract:
There should be about 10000 stellar hierarchical systems within 100pc
with primary stars more massive than 0.5M☉, and a similar amount
of less-massive hierarchies. A list of 8000 candidate multiples is
derived from wide binaries found in the Gaia Catalog of Nearby Stars
where one or both components have excessive astrometric noise or other
indicators of inner subsystems. A subset of 1243 southern candidates
were observed with high angular resolution at the 4.1m Southern
Astrophysical Research Telescope, and 503 new pairs with separations
from 0.03" to 1" were resolved. These data allow estimation of the
inner mass ratios and periods, and help to quantify the ability of
Gaia to detect close pairs. Another 621 hierarchies with known inner
periods come from the Gaia catalog of astrometric and spectroscopic
orbits. These two nonoverlapping groups, combined with existing
ground-based data, bring the total number of known nearby hierarchies
to 2754, reaching a completeness of ∼22% for stars above 0.5M☉.
Distributions of their periods and mass ratios are briefly discussed,
and the prospects of further observations are outlined.
Description:
The high-resolution camera, HRCam, is an optical speckle imager
operating at Southern Astrophysical Research (SOAR) since 2007. In each
HRCam observation, two image cubes of 200x200pixels and 400 frames are
taken with an exposure time of 25ms and a pixel scale of 15mas. The
observations were made in the I filter to maximize the flux from red
stars and the detectability of faint red companions. The classical
resolution limit set by diffraction is 40mas, but closer pairs of
near-equal stars were detected down to a 30mas separation from the
asymmetry of the speckle power spectrum; measurements of their
positions are inaccurate.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 1384 Results of the SOAR Speckle Survey
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See also:
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2020)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
J/A+A/382/118 : Spectroscopic sub-systems in multiple stars (Tokovinin+, 2002)
J/A+A/450/681 : Companions to close spectroscopic binaries (Tokovinin+, 2006)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/147/87 : From binaries to multiples II. Statistic data (Tokovinin, 2014)
J/ApJS/235/6 : Updated Multiple Star Catalog; Sept 2021 (Tokovinin, 2018)
J/ApJS/247/66 : SUPERWIDE; wide binaries in Gaia & SUPERBLINK (Hartman+, 2020)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars (Gaia collaboration, 2021)
J/AJ/162/192 : SOAR TESS survey II. Impact stellar companions (Ziegler+, 2021)
J/AJ/163/161 : Spectro. of Subsystems Multiple Stars. VIII. (Tokovinin, 2022)
J/AJ/164/58 : Speckle Interferometry at SOAR in 2021 (Tokovinin+, 2022)
J/AJ/163/178 : Solar Neighborhood. XLIV. M dwarfs with SOAR (Vrijmoet+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- MSC MSC code identifier (J2000)
12- 13 A2 --- Comp Component letter
15- 24 F10.6 deg RAdeg [0/360] Right ascension (J2000)
26- 35 F10.6 deg DEdeg [-89/20] Declination (J2000)
37- 43 F7.4 yr Date [21/24] Date (Julian year; JY-2000)
45- 49 F5.1 deg PA [0/360] Position angle (1)
51- 57 F7.4 arcsec Sep [0/3.64] Separation
59- 63 F5.1 mag DmagI [-0.2/6.6] Magnitude difference
65- 66 A2 --- Flag Flag for quadrant, noisy data, filter (2)
68- 72 F5.3 arcsec rho [0/0.13] Resolution limit (ρmin)
74- 77 F4.2 mag dI0.15 [0.5/4.98] Magnitude limit at 0.15" sep.
79- 82 F4.2 mag dI1 [0.0/6.18] Magnitude limit at 1" sep.
84- 87 A4 --- NSS NSS solution code (--- if not in NSS)
89-100 A12 --- Syst System identifier (UR if unresolved)
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Note (1): For unresolved targets PA, Sep, and DmagI are zero
Note (2): Flags as follows:
q = quadrant determined,
* = photometry from long-exposure image,
: = noisy or below resolution limit,
y = filter y
:y = noisy or below resolution limit and filter y
qy = quadrant determined and filter y
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 14-Sep-2023