Bremen 2017 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 14: Postersitzung
GR 14.1: Poster
Donnerstag, 16. März 2017, 14:00–16:00, SFG 0150
Relativistic Effects in Spectroscopic Binary Stars - Paving the way to precise stellar mass determinations — •Vanessa Fahrenschon1,2,3, Roberto Saglia2,1, and Luca Pasquini3 — 1University Observatory Munich, Ludwig-Maximilians-Universität München, Germany — 2Max Planck Institute for extraterrestrial Physics, Garching, Germany — 3European Southern Observatory, Garching, Germany
High-resolution spectroscopy is one of the most powerful tools of modern observational astrophysics. With the incorporation of new measurement and calibration techniques, e.g. laser frequency combs, precisions will soon reach the 1m/s level and allow for direct measurements of relativistic effects in nearby stellar systems.
In this work, radial velocities (RVs) of double-lined spectroscopic binaries (SB2s) are used to detect periodic redshifts due to special and general relativistic effects. Simulations of all expected redshift contributions, depending on the binary system's parameters, are presented. A comparison with state-of-the-art measurements is made to show the necessity to take relativistic effects into account in the future.
Due to the availability of more RV curve fit parameters in SB2 systems than in other systems, it will soon be possible to determine the masses of both stellar components separately in a very precise way. This can be done without having to use additional information from astrometry or other measurements, making this a very important tool for all fields of astrophysics.