J/AJ/157/56 DSSI observations of binary & trinary star systems (Horch+, 2019)
Observations of binary stars with the Differential Speckle Survey Instrument.
VIII. Measures of metal-poor and triple stars from 2015 to 2018.
Horch E.P., Tokovinin A., Weiss S.A., Lobb J., Casetti-Dinescu D.I.,
Granucci N.M., Hess N.M., Everett M.E., van Belle G.T., Winters J.G.,
Nusdeo D.A., Henry T.J., Howell S.B., Teske J.K., Hirsch L.A., Scott N.J.,
Matson R.A., Kane S.R.
<Astron. J., 157, 56 (2019)>
=2019AJ....157...56H 2019AJ....157...56H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, double and multiple ; Photometry ;
Optical ; Interferometry
Keywords: binaries: visual - stars: individual -
techniques: high angular resolution - techniques: interferometric -
techniques: photometric
Abstract:
We present 248 speckle observations of 43 binary and 19 trinary star
systems chosen to make progress in two main areas of investigation: the
fundamental properties of metal-poor stars and star formation mechanisms.
The observations were taken at the Gemini North and South telescopes
during the period 2015 July to 2018 April, mainly with the Differential
Speckle Survey Instrument but also with a few early results from the
new 'Alopeke speckle camera at Gemini North. We find that the astrometry
and photometry of these observations as a whole are consistent with
previous work at Gemini. We present five new visual orbits for systems
important in understanding metal-poor stars, three of which have orbital
periods of less than 4 yr, and we indicate the degree to which these and
future observations can impact our knowledge of stellar properties and
star formation. In particular, we find a decrease in mass at fixed spectral
type for metal-poor stars versus their solar-metallicity analogs that
is consistent with predictions that are made from current stellar models.
Description:
The observations described here were taken at the Gemini North and
South telescopes over the period of 2015 July through 2018 April. Results
from seven different observing runs have been combined, including two
in which the new 'Alopeke speckle camera (Scott et al. 2016SPIE.9907E..2RS;
N. J. Scott et al. 2018, in preparation) was used at Gemini North. However,
in total, the observations here represent the use of only about 3 nights
of telescope time, including all calibrations. The sample is bright
(V=2-11) and nearby (median distance=56 pc), and Gemini's large aperture
enables the resolution and measurement of extremely small-separation
systems.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 248 Binary star speckle measures
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
B/wds : The Washington Visual Double Star Catalog (Mason+ 2001-2014)
J/AJ/127/1727 : Differential magnitudes of binary stars (Horch+, 2004)
J/other/AstBu/63.278 : Metal-poor stars speckle interferometry
(Rastegaev+, 2008)
J/AJ/141/45 : Speckle observations of HIP stars (Horch+, 2011)
J/AJ/150/151 : DSSI observations of binaries. VI. Measures in 2014
(Horch+, 2015)
J/AJ/153/212 : Observations of binary stars at the WIYN telescope
(Horch+, 2017)
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 Washington Double Star designation (HHMMm+DDMM,
J2000)
12- 21 A10 --- OName Other designation
23- 30 A8 --- Disc Discoverer designation
32- 36 A5 --- Comp Components designation
38- 43 A6 --- HIP Hipparcos catalogue number
45- 51 F7.4 yr Date [14.5637/18.2525] Besselian date of the
observation (offset 2000)
53- 57 F5.1 deg PA [1/355.9]? Position angle of the secondary star
relative to the primary
59- 60 A2 --- f_PA Flag on PA (1)
62- 67 F6.4 arcsec Sep [0.0067/1.4154]? Separation of the two stars
69 A1 --- l_Dmag [<>] Limit flag on Dmag
70- 74 F5.2 mag Dmag [-0.55/7.74]? Magnitude difference
76 A1 --- f_Dmag [acde] Flag on Dmag (2)
78- 80 I3 nm lambda [562/880] Center wavelength of the filter used
82- 83 I2 nm FWHM [40/50] Full width at half maximum of the filter
transmission
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Note (1): Flag as follows:
b/b? = Quadrant inconsistent with previous measures in the 4th Interferometric
Catalog, Hartkopf et al. (2001AJ....122.3480H 2001AJ....122.3480H).
Note (2): Photometry note as follows:
a = Photometry for this observation appears as an upper limit because the
observation may be affected by speckle decorrelation as discussed in the
text;
c = A magnitude difference for this single-lined spectroscopic binary does not
appear for the reasons discussed in the text for small-separation systems;
d = The position angle of this observation was found to be in the opposite
quadrant than that of the observation in the other filter. To keep the
position angles consistent, we adopt a negative magnitude difference for
this observation;
e = The component was undetected in this filter, with a lower limit in the
magnitude difference shown.
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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 VI. 2015AJ....150..151H 2015AJ....150..151H, Cat. J/AJ/150/151
Horch et al. Paper VII. 2017AJ....153..212H 2017AJ....153..212H, Cat. J/AJ/153/212
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 17-May-2019