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We have identified a new vibrational HCN maser at 89.087 GHz in theasymptotic giant branch (AGB) star IRAS 15082-4808, a maser which is thought totrace the innermost region of an AGB envelope. The observations of this maserat three epochs are presented: two positive detections and one null detection.The line profile has varied between the positive detections, as has theintensity of the maser. The major component of the maser is found to be offsetby -2.0+/-0.9 km/s with respect to the systemic velocity of the envelope, asderived from the 88.631 GHz transition of HCN. Similar blueshifts are measuredin the other 9 sources where this maser has been detected. Maser variabilitywith pulsation phase has been investigated for the first time using the 10stars now available. Comparisons with AGB model atmospheres constrain theposition of the formation region of the maser to the region between thepulsation shocks and the onset of dust acceleration, between 2 and 4 stellarradii.

A new HCN maser in IRAS 15082-4808