EB091
EB091 first epoch Ross867 astrometry
The M3.5 dwarf Ross 867 is active in radio, and can readily be detected by the EVN. We are characterizing its emission by studying its polarization, variability and astrometry. In order to improve the astrometric accuracy, we are using the MultiView method to increase the astrometric accuracy down to the thermal noise level, and should be able to achieve 0.1 mas uncertainty. We propose extending our existing series of polarimetric, astrometric observations with three additional sessions to achieve comparable astrometric accuracy to the Gaia published results, and to possibly determine higher order astrometric terms. This will provide unique constraints on the emission mechanism and nature of the system. Ross 867 has a nearby (16") companion Ross868 (M4.5) which we are also monitoring for emission, but have been unable to detect so far. We propose to continue monitoring the companion by requesting an additional correlation phase center on its position.
Observation pages at the EVN archive:
This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197