J/MNRAS/496/2605 ASAS census of twins (Bakis+, 2020)
ASAS census of twins.
Bakis V., Eker Z., Sari O., Yucel G., Sonbas E.
<Mon. Not. R. Astron. Soc., 496, 2605-2612 (2020)>
=2020MNRAS.496.2605B 2020MNRAS.496.2605B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Binaries, orbits ; Photometry ;
Spectroscopy ; Optical
Keywords: catalogues - surveys - binaries: eclipsing
Abstract:
Twin binaries were identified among the eclipsing binaries with
δ>-30° listed in the All Sky Automated Survey (ASAS)
catalogue. In addition to the known twin binaries in the literature,
68 new systems have been identified and photometric and spectroscopic
observations were done. Colour, spectral type, temperature, ratio of
radii and masses of the components have been derived and are
presented. Including 12 twin binary systems that exist in both ASAS
and the catalogue of absolute parameters of detached eclipsing binary
stars, a total of 80 twin detached binary systems have been
statistically studied. A comparison of the spectral type distribution
of the twins with those of detached eclipsing binary stars in the ASAS
database shows that the spectral type distribution of twins is similar
to that of detached systems. This result has been interpreted as
indicating that there is no special formation mechanism for twins
compared to normal detached binaries. As a result of our case study
for HD 154010, a twin binary, we present the precise physical
parameters of the system.
Description:
The twin candidates are observed with four different telescopes. The
observations are divided into two groups, photometric and
spectroscopic. The photometric observations were done with three
different telescopes (T100, UBT60, ADYU60) and CCDs (SI1100, Alta U47,
iKon-M 934) equipped with standard Johnson UBVRI filters. All the
photometric observations, which were performed in several observing
runs between 2014 and 2017, were transformed to the standard system.
Spectroscopic observations were made by two echelle spectrographs, the
TUG Faint Object Spectrograph (TFOSC) and Shelyak Instruments eShel
Spectrograph (SIeS), attached to the RTT150 and UBT60 telescopes,
respectively. The RTT150+TFOSC combination is capable of observing
stars in echelle mode down to the 13th magnitude. It provides spectra
between λλ3900 and 9000 in 11 echelle orders with a
resolving power of R∼5600. SIeS is fed by two fibres, one for the
object and the other for calibration, and is used with a ThAr lamp.
SIeS is equipped with a CCD camera that has 2184x1472 pixels of
6.8x6.8µm each covering a wavelength range of
λλ4050-8160 with a resolving power of R∼12000. The
UBT60+eShel combination is capable of observing stars down to the 11th
magnitude.
If a spectrum exists for a twin, some physical parameters related to
its atmosphere such as surface temperature, gravity, metallicity,
projected rotation velocity, micro- and macro-turbulence velocity
could be obtained by modelling the spectral features. In this study,
the spectra of the target stars were obtained at orbital phases close
to quadrature, which allowed us to see and model spectral features of
both components as well as their relative velocities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 93 68 Basic information and photometric data for ASAS
twins
table5.dat 75 68 Results from the analysis of photometric and
spectral data
table6.dat 57 12 Twins in the list of absolute parameters of 509
main-sequence stars (Eker et al.
2018MNRAS.479.5491E 2018MNRAS.479.5491E, Cat. J/MNRAS/479/5491)
table7.dat 30 8 The RVs of the components of HD 154010
table8.dat 112 1 Parameters of the spectroscopic orbit of
HD 154010
table9.dat 130 1 V-band LC model parameters of HD 154010
table10.dat 341 1 Binary stellar parameters of HD 154010
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars
(Eker+, 2018)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/68] Internal source identifier
4- 16 A13 --- ASAS ASAS source identifier (HHMMSS+DDMM.m)
18- 38 A21 --- Name Source name
40- 49 F10.4 d T0 Ephemeris time (HJD-2400000)
51- 59 F9.6 d P Orbital period
61- 65 F5.2 mag Vmag ? Observed V-band magnitude
67- 71 F5.2 mag U-B ? Observed U-B color
73- 77 F5.2 mag B-V ? Observed B-V color
79- 83 F5.2 mag V-R ? Observed V-R color
85- 88 F4.2 mag V-I ? Observed V-I color
90- 93 I4 pc Dist ? Distance from Gaia DR2
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/68] Internal source identifier
4- 16 A13 --- ASAS ASAS source identifier (HHMMSS+DDMM.m)
18- 21 I4 K Teff1 Primary effective temperature
23- 26 I4 K Teff2 Secondary effective temperature
28- 31 F4.2 [cm/s2] logg ? Surface gravity
33- 37 F5.3 --- r1/r2 Primary to secondary radius ratio
39- 43 F5.3 --- M1/M2 Primary to secondary mass ratio
45 A1 --- f_M1/M2 [*] Flag on M1/M2 (1)
47- 49 I3 km/s Vrot ? Rotational velocity
51- 55 F5.3 --- Phase ? Orbital phase at the time of spectroscopic
observation
57- 59 I3 km/s DV ? Radial velocity difference of the
components at the time of observation
61- 72 A12 --- SpType Spectral type
74- 75 A2 --- q_SpType Spectral type quality mark (2)
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Note (1): Flag as follows:
* = HD 154010 (ASAS 170158+2348) is one of the systems selected for
systematic observations. As far as we are aware, like most of the twins
in our list, there are no studies related to HD 254010 in the
literature.
Note (2): Quality flag as follows:
A = Spectroscopy is available and the spectral type is determined by
spectral modelling. Depending on the consistency of models with spectral
data, grade A is divided into A+ and A-.
B = The spectral type is determined by three CC diagrams
C = The spectral type is supported by two CC diagrams
D = The spectral type is supported by only one CC diagram
E = In some cases, due to the uncertainty of the observed colour, the star's
extinction line does not intersect the curve of the unreddened
main-sequence stars. If this is the case for three CC diagrams and
there is no spectroscopic observations of that star, then the spectral
type is adopted from the observed colour corresponding to the spectral
type given by the Gaia input catalogue (Gaia Collaboration et al.
2016A&A...595A...1G 2016A&A...595A...1G, Cat. I/337,2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ID [1/12] Internal source identifier
4- 16 A13 --- ASAS ASAS source identifier (HHMMSS+DDMM.m)
18- 22 I5 K Teff1 Primary effective temperature
24- 27 I4 K Teff2 Secondary effective temperature
29- 33 F5.3 [cm/s2] logg1 ? Primary surface gravity
35- 39 F5.3 [cm/s2] logg2 ? Secondary surface gravity
41- 45 F5.3 --- r1/r2 Primary to secondary radius ratio
47- 51 F5.3 --- M1/M2 Primary to secondary mass ratio
53- 57 A5 --- SpType Spectral type
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Heliocentric Julian date (HJD-2400000)
13- 16 F4.2 --- Phase Orbital phase
18- 23 F6.1 km/s RV1 ? Radial velocity of the primary
25- 30 F6.1 km/s RV2 Radial velocity of the secondary
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Binary name (HD 154010)
11- 17 F7.5 d P Orbital period
19- 24 F6.4 d T0 Ephemeris time (HJD-2458353)
26- 31 F6.4 d e_T0 Error on T0
33- 37 F5.2 km/s K1 Velocity semi-amplitude of primary
39- 42 F4.2 km/s e_K1 Error on K1
44- 48 F5.2 km/s K2 Velocity semi-amplitude of secondary
50- 53 F4.2 km/s e_K2 Error on K2
55- 57 F3.1 --- e Eccentricity (fixed to 0)
59- 64 F6.2 km/s Vsys Systemic velocity
66- 69 F4.2 km/s e_Vsys Error on Vsys
71- 75 F5.3 --- q M2/M1 mass ratio
77- 81 F5.3 --- e_q Error on q
83- 86 F4.2 Msun m1sini3 Primary component mass
88- 91 F4.2 Msun e_m1sini3 Error on m1sini3
93- 96 F4.2 Msun m2sini3 Secondary component mass
98- 101 F4.2 Msun e_m2sini3 Error on m2sini3
103- 107 F5.2 Rsun asini Projected semi-major axis
109- 112 F4.2 Rsun e_asini Error on asini
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Binary name (HD 154010)
11- 17 F7.5 d P Orbital period
19- 24 F6.4 d T0 Ephemeris time (HJD-2452709)
26- 31 F6.4 d e_T0 Error on T0
33- 36 I4 K Teff1 Primary effective temperature
38- 41 I4 K Teff2 Secondary effective temperature
43- 44 I2 K e_Teff2 Error on Teff2
46- 49 F4.2 --- q M2/M1 mass ratio
51- 54 F4.2 --- L1/L1+2 Primary luminosity to total luminosity ratio
56- 59 F4.2 --- e_L1/L1+2 Error on L1/L1+2
61- 63 F3.1 --- e Eccentricity (fixed to 0)
65- 67 F3.1 deg omega Argument of periastron
69- 72 F4.1 deg i Inclination
74- 76 F3.1 deg e_i Error on i
78- 82 F5.3 --- Omega1 Surface gravity potential of the primary
84- 88 F5.3 --- e_Omega1 Error on Omega1
90- 94 F5.3 --- Omega2 Surface gravity potential of the secondary
96- 100 F5.3 --- e_Omega2 Error on Omega2
102- 106 F5.3 --- r1 Fractional radius of the primary (1)
108- 112 F5.3 --- e_r1 Error on r1
114- 118 F5.3 --- r2 Fractional radius of the secondary (1)
120- 124 F5.3 --- e_r2 Error on r2
126- 130 F5.3 --- chi2 Reduced chi-squared
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Note (1): The fractional radius is the stellar radius to semi-major axis ratio
r=R/a
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Binary name (HD 154010)
11- 13 A3 --- SpType1 Spectral type of the primary
15- 17 A3 --- SpType2 Spectral type of the secondary
19- 22 F4.2 Msun M1 Mass of the primary
24- 27 F4.2 Msun e_M1 Error on M1
29- 32 F4.2 Msun M2 Mass of the secondary
34- 37 F4.2 Msun e_M2 Error on M2
39- 42 F4.2 Rsun R1 Radius of the primary
44- 47 F4.2 Rsun e_R1 Error on R1
49- 52 F4.2 Rsun R2 Radius of the secondary
54- 57 F4.2 Rsun e_R2 Error on R2
59- 63 F5.2 Rsun a Semi-major axis
65- 68 F4.2 Rsun e_a Error on a
70- 76 F7.5 d P Orbital period
78- 82 F5.2 deg i Inclination
84- 87 F4.2 deg e_i Error on i
89- 92 F4.2 --- q Mass ratio M1/M2
94- 97 F4.2 --- e_q Error on q
99- 101 F3.1 --- e Eccentricity (fixed to 0)
103- 107 F5.3 [cm/s2] logg1 Surface gravity of the primary
109- 113 F5.3 [cm/s2] e_logg1 Error on logg1
115- 119 F5.3 [cm/s2] logg2 Surface gravity of the secondary
121- 125 F5.3 [cm/s2] e_logg2 Error on logg2
127- 130 F4.2 mag Vmag Visual magnitude of the system
132- 135 F4.2 mag V1mag Visual magnitude of the primary
137- 140 F4.2 mag e_V1mag Error on V1mag
142- 145 F4.2 mag V2mag Visual magnitude of the secondary
147- 150 F4.2 mag e_V2mag Error on V2mag
152- 155 F4.2 mag B-V B-V colour index of the system
157- 160 F4.2 mag e_B-V Error on B-V
162- 165 I4 K Teff1 Effective temperature of the primary
167- 169 I3 K e_Teff1 Error on Teff1
171- 174 I4 K Teff2 Effective temperature of the secondary
176- 178 I3 K e_Teff2 Error on Teff2
180- 184 F5.3 Lsun logL1 Logarithm of the primary luminosity
186- 190 F5.3 Lsun e_logL1 Error on logL1
192- 196 F5.3 Lsun logL2 Logarithm of the secondary luminosity
198- 202 F5.3 Lsun e_logL2 Error on logL2
204- 208 F5.3 mag Mbol1 Bolometric magnitude of the primary
210- 214 F5.3 mag e_Mbol1 Error on Mbol1
216- 220 F5.3 mag Mbol2 Bolometric magnitude of the secondary
222- 226 F5.3 mag e_Mbol2 Error on Mbol2
228- 232 F5.3 mag VMAG1 Absolute visual magnitude of the primary
234- 238 F5.3 mag e_VMAG1 Error on VMAG1
240- 244 F5.3 mag VMAG2 Absolute visual magnitude of the secondary
246- 250 F5.3 mag e_VMAG2 Error on VMAG2
252- 256 F5.3 mag BC1 Bolometric correction of the primary
258- 262 F5.3 mag e_BC1 Error on BC1
264- 268 F5.3 mag BC2 Bolometric correction of the secondary
270- 274 F5.3 mag e_BC2 Error on BC2
276- 280 F5.2 km/s K1 Velocity amplitude of the primary
282- 285 F4.2 km/s e_K1 Error on K1
287- 291 F5.2 km/s K2 Velocity amplitude of the secondary
293- 296 F4.2 km/s e_K2 Error on K2
298- 302 F5.1 km/s Vsys Systemic velocity
304- 306 F3.1 km/s e_Vsys Error on Vsys
308- 311 F4.1 km/s Vsynch1 Synchronization velocity of the primary
313- 315 F3.1 km/s e_Vsynch1 Error on Vsynch1
317- 320 F4.1 km/s Vsynch2 Synchronization velocity of the secondary
322- 324 F3.1 km/s e_Vsynch2 Error on Vsynch2
326- 327 I2 km/s Vrot1 Rotational velocity of the primary
329 I1 km/s e_Vrot1 Error on Vrot1
331- 332 I2 km/s Vrot2 Rotational velocity of the secondary
334 I1 km/s e_Vrot2 Error on Vrot2
336- 338 I3 pc Dist Distance of the system
340- 341 I2 pc e_Dist Error on Dist
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 30-Jun-2023