Undetected Binary Stars Cause an Observed Mass-dependent Age Gradient in Upper Scorpius [PDF]
Astrophysical Journal, 2021 Young stellar associations represent a key site for the study of star formation, but to accurately compare observations to models of stellar evolution, the age of an association must be determined. The Upper Scorpius region is the youngest section of the
K. Sullivan, A. Kraus
semanticscholar +1 more source
Velocity curve analysis of the spectroscopic binary stars by the non-linear least squares [PDF]
, 2007 We will introduce a new method to derive the orbital elements of the spectroscopic binary stars. Fitting the adopted radial velocity curves on the measured experimental data, the corresponding radial acceleration data are obtained. The orbital parameters
K. Karami, H. Teimoorinia
semanticscholar +2 more sources
Asteroseismology of binary stars and a compilation of core overshoot and rotational frequency values of OB stars [PDF]
, 2013 After a brief introduction into the asteroseismic modelling of stars, we provide a compilation of the current seismic estimates of the core overshooting parameter and of the rotational frequency of single and binary massive stars. These important stellar
Aerts, Conny
core +2 more sources
Line Broadening in Field Metal-poor Red Giant and Red Horizontal Branch Stars [PDF]
, 2007 We report 349 radial velocities for 45 metal-poor field red giant and red horizontal branch stars. We have have identified one new spectroscopic binary, HD 4306, and one possible such system, HD 184711.
Alonso A. +16 more
core +3 more sources
HIGH-PRECISION ORBITAL AND PHYSICAL PARAMETERS OF DOUBLE-LINED SPECTROSCOPIC BINARY STARS—HD78418, HD123999, HD160922, HD200077, AND HD210027 [PDF]
, 2009 We present high-precision radial velocities (RVs) of double-lined spectroscopic binary stars HD78418, HD123999, HD160922, HD200077, and HD210027. They were obtained based on the high-resolution echelle spectra collected with the Keck I/HIRES, Shane/CAT ...
M. Konacki +3 more
semanticscholar +1 more source
WIYN Open Cluster Study. LXXXII. Radial-velocity Measurements and Spectroscopic Binary Orbits in the Open Cluster NGC 7789 [PDF]
Astronomical Journal, 2020 We present an extensive time-series radial-velocity (RV) survey of stars in the rich open cluster NGC 7789 (1.6 Gyr, [Fe/H] = +0.02). The stellar sample lies within an 18′ circular radius from the cluster center (10 pc in projection, or about 2 core ...
Andrew C. Nine +6 more
semanticscholar +1 more source
A Spectroscopic Study of Binary Star Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 1993 A comprehensive spectrophotometric survey of the central stars of planetary nebulae with known or suspected binary star nuclei (BSPN) is underway. The aims of this programme are: to determine the nature of the companion to the ionising star of the nebula; to estimate the spectroscopic distance from the spectral type and magnitude of the companion and ...
Jeremy R. Walsh +2 more
openaire +2 more sources
AGB stars in binaries and their progeny [PDF]
, 1998 It is currently admitted that an AGB star in a binary system is likely to pollute its companion with carbon- and s-process-rich matter. After the AGB star has faded into an unconspicuous white dwarf, the polluted companion enters the zoo of stars with ...
Jorissen, A.
core +3 more sources
A survey for low-mass spectroscopic binary stars in the young clusters around σ Orionis and λ Orionis [PDF]
, 2008 We have obtained multi-epoch, high-resolution spectroscopy of 218 candidate low-mass stars and brown dwarfs (BDs) in the young clusters around a Ori and \ Ori.
P. Maxted +5 more
semanticscholar +1 more source
Small Mass Ratio Contact Binary GR Vir and HV Aqr [PDF]
Journal of Astronomy and Space Sciences, 2004 The absolute dimensions of low mass contact binary, GR Vir and HV Aqr were obtained using WD program from the published spectroscopic and photometric observational data.
Kyu-Dong Oh +4 more
doaj +1 more source