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Proposal Identification No.:

A2619

Date Received:

2011-Feb-06 11:18:26

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy 30 Hours 15 min

To investigate a dust formation event in WX Psc

Monitoring the ratio of red and blue-shifted 1612 MHz peak fluxes from the bright OH/IR star WX Psc utilizes a sensitive form of differential photometry. The resulting 'light' curve exhibits a well-defined cusp in each pulsation cycle. These are attributable to a sudden change in available pump photons consequent on the avalanche production of dust as the leading edge of an outwardly directed shock wave reaches the dust formation radius: a cusp is then generated by the light travel-time delay across the shell of the red-shifted maser. This proposal aims to explore the dynamics of the dust formation process by monitoring the 1612 MHz flux ratio through one dust formation event.

Name Murray Lewis

Institution NA

E-mail blewis@naic.edu

Phone 787 890 5010

Student no

Remote Observing Request

Observer will travel to AO Remote Observing X In Absentia (instructions to operator)

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1


1612 - 1670 MHz

2