Looking for Signs of Unresolved Binarity in the Continuum of LAMOST Stellar Spectra
arXiv:2508.20802 · doi:10.3390/galaxies13040083
Abstract
We describe an attempt to derive the binarity rate of samples of 166 A-, F-, G-, and K-type stars from LAMOST DR5 and 1000 randomly selected presumably single stars from Gaia DR3 catalogs. To this end, we compared continua of the observed spectra with the continua of synthetic spectra in the 3700 to 9097 Angstrom range. The latter spectra were reduced to the LAMOST set of wavelengths, while the former ones were smoothed. Next, we searched for every observed star the nearest synthetic spectrum using a four-parameter representation - effective temperature, gravity, [Fe/H], and a range of interstellar absorption values. However, rms deviations of observed spectra from synthetic ones appeared to be not sufficient to claim that any of the stars is a binary. We conclude that comparison of the intensity of pairs of spectral lines remains the best way to detect binarity.
29 p.p., 5 Figures
References in corpus (28)
- Gaia Early Data Release 3: The astrometric solution
- Gaia Early Data Release 3: Photometric content and validation
- The GALAH+ Survey: Third Data Release
- New Grids of ATLAS9 Model Atmospheres
- APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
- Unresolved stellar companions with Gaia DR2 astrometry
- The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V
- Three-dimensional mapping of the local interstellar medium with composite data
- Gaia Data Release 3: Apsis II -- Stellar Parameters
- Close Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color-Magnitude Diagram
- Astrometric Identification of Nearby Binary Stars I: Predicted Astrometric Signals
- Gaia DR3 detectability of unresolved binary systems
- Signatures of unresolved binaries in stellar spectra: implications for spectral fitting
- Prospects for Measuring Abundances of >20 Elements with Low-resolution Stellar Spectra
- Unresolved Binary Exoplanet Host Stars Fit as Single Stars: Effects on the Stellar Parameters
- Double-, triple-line spectroscopic candidates in the LAMOST Medium-Resolution Spectroscopic Survey
- Undetected Binary Stars Cause an Observed Mass Dependent Age Gradient in Upper Scorpius
- Gaia Data Release 3: Ellipsoidal Variables with Possible Black-Hole or Neutron Star secondaries
- The Gaia-ESO Survey: detection and characterization of single line spectroscopic binaries
- LAMOST Spectrograph Response Curves: Stability and Application to flux calibration
- Data-driven spectroscopic estimates of absolute magnitude, distance and binarity -- method and catalog of 16,002 O- and B-type stars from LAMOST
- Unresolved Binaries and Multiples in the Intermediate Mass Range in open clusters: Pleiades, Alpha Per, Praesepe, and NGC 1039
- The Binarity of Early-type Stars from LAMOST Medium-resolution Spectroscopic Survey
- Unresolved binaries and Galactic clusters' mass estimates
- Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue - X. Three high-contrast systems with secondaries detected with IR spectroscopy
- Photometric Determination of Main-Sequence Binaries with Gaia
- Autonomous Disentangling for Spectroscopic Surveys
- Reconstruction and Analysis of Component Spectra of Binary and Multiple Stars