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We have used near- and mid-infrared interferometry to investigate thepulsating atmosphere and the circumstellar environment of the Mira variable RRAql. Observations were taken with the VLTI/AMBER (near infrared) and theVLTI/MIDI (mid infrared) instruments. We have obtained a total of 15 MIDIepochs between Apr 9, 2004 and Jul 28, 2007 covering 4 pulsation cycles and oneAMBER epoch on Sep 9, 2006 at phase 2.82. This work is also part of an ongoingproject of joint VLTI and VLBA observations to study the connection betweenstellar pulsation and the mass loss process. Here we present a comparison ofthe AMBER visibility data to a simple uniform disk model as well as topredictions by recent self-excited dynamic model atmospheres. The best fittingphotospheric angular diameter of the model atmosphere at phase 2.82 is 9.9 +/-2.4 mas.

Coordinated AMBER and MIDI observations of the Mira variable RR Aql