Diffuse Interstellar Band at 862 nm as a Reddening Tracer for GAIA |
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| Authors: | Arūnas Ku?inskas Vladas Vansevi?ius |
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| Institution: | (1) Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius, 2600, Lithuania;(2) Vilnius University Observatory, Čiurlionio 29, Vilnius, 2009, Lithuania |
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| Abstract: | We investigate the plausibility of using diffuse interstellar band at862 nm for tracing interstellar extinction with the ESA's
astrometric space mission GAIA. For this purpose we perform numerical tests to simulate the conditions of real observations,
covering a wide range of stellar parameters and different amounts of interstellar extinction. Our simulations indicate that
with the present Radial Velocity Spectrometer setup the uncertainty in color excess of σE(B-V)≤ 0.05 can be achieved only for the interstellar reddening tracers brighter than V ∼ 13. None of the plausible tracers can provide accurate color excesses (σ
E(B-V)
≤ 0.05) at the distances beyond 2 kpc. We therefore conclude that with the currently planned instrumentation onboard GAIA
this method can not be used as a stand-alone approach for probing interstellar extinction on the Galactic distance scales
within the framework of the GAIA mission.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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