Pulsation-triggered dust production by asymptotic giant branch stars
- McDonald, I.
- De Beck, E.
- Zijlstra, A. A.
- Lagadec, E.
DOIAbstract
Eleven nearby (<300 pc), short-period (50–130 d) asymptotic giant branch (AGB) stars were observed in the CO J = 2−1 line. Detections were made towards objects that have evidence for dust production (Ks − [22] ≳ 0.55 mag; AK Hya, V744 Cen, RU Crt, α Her). Stars below this limit were not detected (BQ Gem, ε Oct, NU Pav, II Hya, CL Hyi, ET Vir, SX Pav). Ks − [22] colour is found to trace mass-loss rate to well within an order of magnitude. This confirms existing results, indicating a factor of 100 increase in AGB-star mass-loss rates at a pulsation period of ∼60 d, similar to the known ‘superwind’ trigger at ∼300 d. Between ∼60 and ∼300 d, an approximately constant mass-loss rate and wind velocity of ∼3.7 × 10−7 M⊙ yr−1 and ∼8 km s−1 is found...
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