A high-resolution spectroscopic survey of late-type stars: chromospheric activity, rotation, kinematics, and age

TL;DR

This study compiles and analyzes high-resolution spectroscopic data of 144 young, active stars to explore their chromospheric activity, rotation, kinematics, and age, providing a valuable resource for understanding stellar evolution in the solar neighborhood.

Contribution

The paper provides a comprehensive, publicly accessible catalog of spectroscopic measurements for 144 stars, including velocities, activity indicators, and kinematics, enabling future research on stellar formation and evolution.

Findings

Identification of two distinct populations of chromospheric emitters.

Correlation between Halpha emission levels and stellar properties.

Data supports understanding of stellar age and activity relationships.

Abstract

Aims: We present a compilation of spectroscopic data from a survey of 144 chromospherically active young stars in the solar neighborhood which may be used to investigate different aspects of the formation and evolution of the solar neighborhood in terms of kinematics and stellar formation history. The data have already been used by us in several studies. With this paper, we make all these data accessible to the scientific community for future studies on different topics. Methods: We performed spectroscopic observations with echelle spectrographs to cover the entirety of the optical spectral range simultaneously. Standard data reduction was performed with the IRAF ECHELLE package. We applied the spectral subtraction technique to reveal chromospheric emission in the stars of the sample. The equivalent width of chromospheric emission lines was measured in the subtracted spectra and then converted to fluxes using equivalent width-flux relationships. Radial and rotational velocities were determined by the cross-correlation technique. Kinematics, equivalent widths of the lithium line 6707.8 angstroms and spectral types were also determined. Results: A catalog of spectroscopic data is compiled: radial and rotational velocities, space motion, equivalent widths of optical chromospheric activity indicators from Ca II H & K to the calcium infrared triplet and the lithium line in 6708 angstroms. Fluxes in the chromospheric emission lines and R'HK are also determined for each observation of star in the sample. We used these data to investigate the emission levels of our stars. The study of the Halpha emission line revealed the presence of two different populations of chromospheric emitters in the sample, clearly separated in the log F(Halpha)/Fbol - (V-J) diagram.