photometric analysis with taos zipper mode data wang, tanya t.-y. supervisor : king, sun-kun

Photometric Analysis with TAOS Zipper Mode Data

Wang, Tanya T.-Y.

Supervisor : King, Sun-Kun

TAOS

TAOS Part 1 － Zipper-Mode image

row block 2048*32pixel

Our real image 2048*2048

Time interval : 0.3 secSteady state

2048*7200 pixel

Part 2 － Dealing with the Data (IDL)

Setup the file of each star which includes the information of it’s coordinates and magnitude

in our interesting region of sky.

Whole zipper-mode image row blocks.

Use Source Extractor to determine the magnitudes

of stars in all row blocks.

Use sky-list to collate the coordinates of stars in

each row block and put the same coordinates of

stars into a file.

TAOS

TAOS

Find special data point in our star files

Standard deviation.

curve(ΔX, ΔY , magnitude) ： x-axis is the time sequence

which means the same star

in different time and y-axis is

the value of Δx (x-mx),

Δy (y-my), magnitude.

TAOS

TAOS

0 20 40 60 80 100

M

A

G

N

I

T

U

D

E

0 20 40 60 80 100

M

A

G

N

I

T

U

D

E

TAOS

TAOS

Zipper-mode image Row blocks

Using Source Extractor

Get a file including x, y and magnitudes of all stars in a row block.

x y mag1.1 1.2 131.3 4.5 9.0 . . . . . . . . . . . .2031 29.1 16

Star_1Star_2

Star_3

Star_n

row x y mag 0 9.1 4.2 13 1 9.09 4.1 12.9. . . . . . . . . . . . . . . . . n 9.12 4.15 13.1

File of star_5

Curve of x, y, mag

Part 3 － example010719_zipperc_a020.fit

Starc20_52

TAOS

TAOS

ΔX

ΔY

MAGNITUDE

010719_zipperc_a020.fitStarc20_60

TAOS

TAOS

ΔX

ΔY

MAGNITUDE


TAOS

TAOS

ΔX

ΔY

MAGNITUDE

Four zipper-mode images

TAOS

TAOS

Total star

Possible

Data point

010719_zipperc_a020 192*95 7

010719_zipperc_a021 178*95 0

010719_zipperc_a025 190*95 4

010719_zipperc_a030 192*95 1

Part 4 － Future

Use another tool to determine the magnitude.

Eliminate background from our image – black frame.

Calibration

Improve the ability of tracking. 2-D cross correlation

An photometric analysis program in real-time.

TAOS

TAOS

photometric analysis with taos zipper mode data wang, tanya t.-y. supervisor : king, sun-kun

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