J/MNRAS/429/859 New companions to nearby low-mass stars (Jodar+, 2013)
New companions to nearby low-mass stars.
Jodar E., Perez-Garrido A., Diaz-Sanchez A., Villo I., Rebolo R.,
Perez-Prieto J.A.
<Mon. Not. R. Astron. Soc., 429, 859-867 (2013)>
=2013MNRAS.429..859J 2013MNRAS.429..859J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Photometry
Keywords: instrumentation: high angular resolution - binaries: general -
brown dwarfs - stars: low-mass
Abstract:
We present high-angular-resolution optical I-band imaging of 451
late K to mid-M nearby stars. These observations have been performed
with Astralux and FastCam using the lucky imaging technique. We found
70 companions with separations between 0.1 and 3.5-arcsec, out of
which 28 are new discoveries. We derive a total binary fraction of
20.3+6.9-5.2 per cent. Follow-up observations have been carried out
for 16 of these new binaries and all of them were confirmed as
physically associated systems. Parallaxes are available for 70 per
cent of the binary sample, providing reliable estimates of physical
separations. We have measured separations and position angles as an
initial stage for a systematic follow-up aimed to determine orbital
parameters.
Description:
we present the results of a high-resolution imaging survey of 451 late
K and M dwarfs selected from the Gliese catalogue (Gliese 1969;
Gliese & Jahreiss 1979, 1991, Cat. V/70).
The observations were carried out during 2008 using Astralux at the
2.2m telescope at the Centro Astronomico Hispano Aleman (CAHA,
Almeria, Spain) and FastCam at the 1.5m Carlos Sanchez Telescope at
Teide Observatory (OT, Tenerife, Spain). The observations were done in
the Sloan Digital Sky Survey (SDSS) i band at CAHA with pixel scales
of ∼47mas/pix and the Johnson-Cousin I band at OT with ∼43mas/pix.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 13 451 Objects observed in our survey
table2.dat 161 86 Binary systems found with component separations
lower than 3500mas
table3.dat 38 14 *Ultracool dwarf candidates
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Note on table3.dat: All objects in this table were observed in CAHA using
the SDSS i band.
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See also:
V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Gliese name
10- 11 A2 --- Comp [ABC ] Component
13 A1 --- n_Name [*] *: objects that have companions and
described in more detail in Table 2
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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- 9 A9 --- Name Gliese name
10- 11 A2 --- Comp [ABC ] Component
17- 21 A5 --- SpType SIMBAD, CDS spectral classification
25- 34 A10 "date" Obs.date Observation date (1)
36- 39 I4 mas rho Aangular separation of components (2)
41- 45 F5.1 deg theta Position angle
47- 49 F3.1 deg e_theta rms uncertainty on theta
51- 56 F6.2 AU Sep ?=- Projected separation
58- 62 F5.2 AU e_Sep ? rms uncertainty on Sep
65- 69 F5.3 mag DImag ?=- Estimated magnitude difference in the SDSS
i band (CAHA observations) or
Johnson-Cousin I (OT observations)
70-161 A92 --- Notes Notes (3)
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Note (1): Observations during 2008 January 10 and 11 were carried out at OT and
the others at CAHA.
Note (2): its error is estimated to be less than 10 mas.
Note (3): Objects with column Notes blank or with proper motion data are new
binary systems found in our survey, while objects with a reference in this
column are known binary systems.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Gliese name
10- 11 A2 --- Comp [ABC ] Component
12 A1 --- n_Name [a] a: new binary discovered in this survey
14- 17 A4 --- SpType1 Spectral type of primary
19- 22 F4.2 Msun M1 Mass of primary
24- 27 F4.2 mag Dimag Difference in i magnitude
29- 32 F4.2 Msun M2 Mass of secondary
34- 38 A5 --- SpType2 Spectral type of companion
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Apr-2016