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

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 its formation and evolution 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 λ6707.8 Å 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 λ6708 Å. Fluxes in the chromospheric emission lines and R HK are also determined for each observation of a star in the sample. We used these data to investigate the emission levels of our stars. The study of the Hα emission line revealed two different populations of chromospheric emitters in the sample, clearly separated in the log F Hα /F bol − (V − J) diagram. The dichotomy may be associated with the age of the stars.

Doppler tomography of the black hole binary A0620-00 and the origin of chromospheric emission in quiescent X-ray binaries

“…In Fig. 5 we compare these values with those of chromospherically active single stars (López-Santiago et al 2010) and binary systems (RS CVn and BY Dra classes) from Montes et al (1995). Our value of the Rossby number places the secondary star of A0620-00 in the region of activity saturation, where all measurements tend to the same average value of log R Hα ∼ −3.7, and is consistent with the general trend.…”

Reliable probabilistic determination of membership in stellar kinematic groups in the young disk

“…To look for new members of close young associations or to identify the members of disrupted open clusters, it is crucial to have complementary information, such as that provided by the analysis of high-resolution spectra, which aims to derive the lithium abundance and Hα luminosity (e.g., Biazzo et al 2009;Guillout et al 2009;López-Santiago et al 2010;Fröhlich et al 2012) by the detailed differential abundance analysis (e.g., de Silva et al 2011;Pompéia et al 2011;Tabernero et al 2012) and by other existing criteria (e.g., Eggen 1995;Shkolnik et al 2012;Malo et al 2013;Gagné et al 2014). Our probabilistic methods are being used by Klutsch et al (in prep.…”

Chromospheric activity as age indicator

“…The data include the following sources: Arriagada (2011), Jenkins et al (2011), Baliunas et al (1995, Knutson et al (2010), López-Santiago et al (2010), Gray et al (2003), Schröder et al (2009), Cincunegui et al (2007, Lockwood et al (2007), Duncan et al (1991), Gray et al (2006), Tinney et al (2002), Hall et al (2007), White et al (2007), Henry et al (1996), and Wright et al (2004). Strassmeier et al (2000) measured absolute H and K emission-line fluxes of more than 1000 late-type stars, but they did not report S-index measurements.…”