An early analysis of archival radial-velocity datasets of Barnard's star up to 2015 indicated the presence of at least one significant signal, which had a period of about 230 days, but with rather poor sampling. To elucidate its presence and nature we undertook an intensive monitoring campaign with the CARMENES spectrometer, collecting precise radial-velocity measurements on every possible night during 2016 and 2017. We also obtained overlapping observations with the European Southern Observatory (ESO) HARPS and the HARPS-N instruments. The combined Doppler monitoring of Barnard's star, including archival and newly acquired observations, resulted in 771 radial-velocity epochs (nightly averages), with typical individual precisions of 0.9-1.8m/s, obtained over a timespan of more than 20 years from seven different facilities, and yielded eight independent datasets.(4 data files).
VizieR Online Data Catalog (other)
- Pub Date:
- February 2019
- Stars: variable;
- Radial velocities