An Artificial Variable Star Simulator Doug Welch, McMaster Anthony Tekatch, Unihedron Steve Bickerton, Princeton.

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Presentation transcript:

An Artificial Variable Star Simulator Doug Welch, McMaster Anthony Tekatch, Unihedron Steve Bickerton, Princeton

Why Simulate? Laboratory exercises Training Ground truth for KBO occultation studies Control studies Observer differences Observer differences Biases Biases Temporal Temporal Color Color Scintillation ScintillationExhibits

Prior Art Observing simulated Cepheid variable stars in an introductory astronomy lab Flesch, TR 1979, Am J Phys, 47(3), 232 Telescope + photomultiplier tube! Incandescent bulb + function generator Single star (source) One pulsation cycle, two filters

Prior Art Observing variable stars indoors with a microcomputer and phototransistor Rafert, JB, and Nicklin RC 1983, Am J Phys, 51(7), 668 Telescope + phototransistor Incandescent bulb + Nerf ball! Incandescent 120 Hz = pulsar! Incandescent 120 Hz = pulsar! Single system (source) Oscilloscope output

Gene Hansons Variable Star Light Board V incandescent bulbs Large board SS Cyg field Manual

Developments Small, efficient white LEDs Only prior choice were incandescent bulbs Only prior choice were incandescent bulbs Color temperature now similar to stars Color temperature now similar to stars Roscolux filters for cooler stars Roscolux filters for cooler stars Fast microcontroller clocks 40 MHz = 10 million instructions per second 40 MHz = 10 million instructions per second Decent amount of microcontroller memory 24 to 32k instructions/lookup tables 24 to 32k instructions/lookup tables

Scintillation (1/f noise) Time series from: Gaussian (white) 1/f (flicker) 1/f^2 (Brownian)

Hardware PIC 18F4525 or 18F4620 MCU PIC 18F4525 or 18F4620 MCU MAX 233 serial interface chip MAX 233 serial interface chip 4-to-16 decoder 4-to-16 decoder ULN2803 driver Use of In-circuit Serial Programming

Future Plans Increase number of LEDs to 128 Increase number of LEDs to 128 Self-calibration with TSL237 Self-calibration with TSL237 Individual LED current-to-flux correction Individual LED current-to-flux correction Display time for use with labs Display time for use with labs Analog generation of scintillation noise? Analog generation of scintillation noise? Substitute computer+ethernet control for dedicated microcontroller? Substitute computer+ethernet control for dedicated microcontroller?

DEMO