J/MNRAS/517/356 vsini as SB2 indicator (Kovalev+, 2022)
Detection of 2460 double-lined spectroscopic binary candidates in the LAMOST-MRS
using projected rotational velocities and a binary spectral model.
Kovalev M., Chen X., Han Z.
<Mon. Not. R. Astron. Soc. 517, 356-373 (2022)>
=2022MNRAS.517..367K 2022MNRAS.517..367K (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities ;
Rotational velocities ; Effective temperatures ;
Abundances, [Fe/H] ; Optical
Keywords: binaries : spectroscopic
Abstract:
We present a new method for the detection of double-lined
spectroscopic binaries (SB2s) using Vsini values from spectral fits.
The method is tested on synthetic and real spectra from the Large Sky
Area Multi-Object fiber Spectroscopic Telescope Medium Resolution
Survey. It can reliably detect SB2 candidates for double-lined
binaries with Vsini1+Vsini2<300km/s if the radial velocity separation
is large enough. Using this method, we detected 2460 SB2 candidates,
1410 of which are new discoveries. We confirmed the correlation
between the radial velocity separation estimated by the binary model
and Vsini0 estimated by the single- star model using the selected
sample. Additionally, our method found one new SB2 candidate in open
cluster M11.
Description:
List of SB2 candidates detected in time-domain spectra of LAMOST-MRS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 60 213 Spectra with problem in wavelength calibration
tablec1.dat 43 2460 List of all 2460 SB2 candidates
tabled1.dat 362 265 Stellar parameters for M11 dataset
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
J/MNRAS/510/1515 : Double-lined spectroscopic binaries in M11 (Kovalev+, 2022)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star LAMOST id with encoded sky position RA,DEC,
JHHMMSS.ss+DDMMSS.s
21- 29 F9.4 km/s RV0 Radial velocity from single-star model
31- 39 F9.4 km/s RV2 Radial velocity for secondary component
41- 49 F9.4 km/s RV1 Radial velocity for primary component
51- 60 F10.4 d MJD Observation time
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Byte-by-byte Description of file: tablec1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 21 A19 --- Star LAMOST id with encoded sky position RA,DEC,
JHHMMSS.ss+DDMMSS.s
25- 43 I19 --- GaiaEDR3 Gaia eDR3 source_id
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Byte-by-byte Description of file: tabled1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- CName Cname with encoded sky position RA,DEC,
HHMMSSss+DDMMSSs
(GES JHHMMSSss+DDMMSSs in Simbad)
18- 32 F15.9 d MJD Observation time
34- 52 F19.16 --- chi2s chi squared from single-star fit
54- 71 F18.16 --- chi2sb chi squared from binary fit
73- 87 E15.7 --- fimp Improvement factor
89-100 F12.8 deg RAdeg Right ascension (J2000)
102-112 F11.8 deg DEdeg Declination (J2000)
114-122 F9.5 --- snr Signal to noise ratio of the spectrum
124-135 F12.8 km/s RV0 Radial velocity from the single-star fit
137-149 F13.8 km/s RV1 Radial velocity of the primary component
151-162 F12.8 km/s RV2 Radial velocity of the secondary component
164-181 F18.16 --- q Mass ratio mass of the primary/secondary
183-202 F20.18 --- frac Average luminosity contribution of the
primary component
204-214 F11.5 K Teff0 Effective temperature from the single-star fit
216-225 F10.8 [cm/s2] logg0 Surface gravity from the single-star fit
227-240 F14.11 --- [Fe/H]0 Mettalicity from the single-star fit
242-253 F12.8 km/s vsini0 Projected rotational velocity from the
single-star fit
255-265 F11.5 K Teff2 Effective temperature of the
secondary component
267-276 F10.8 [cm/s2] logg2 Surface gravity of the secondary component
278-289 F12.8 km/s vsini2 Projected rotational velocity of the
secondary component
291-301 F11.5 K Teff1 Effective temperature of the
secondary component
303-312 F10.8 [cm/s2] logg1 Surface gravity of the primary component
314-329 E16.8 --- [Fe/H]1 Metallicity (same for both components)
331-342 F12.8 km/s vsini1 Projected rotational velocity of the
primary component
344-362 I19 --- GaiaEDR3 Gaia eDR3 source_id
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Acknowledgements:
Mikhail Kovalev, kovalev (at) mpia.de
(End) Patricia Vannier [CDS] 18-Oct-2022