Effectiveness Of Phase Dispersion Minimization In Gyrochronology

By: Jeremy Stone

Introduction

Simulated Data

Barry Lutz Telescope (BLT) Data

Catalina Sky Survey Data

Example Light Curve

• Period = 7 days

• Amplitude = .05

• Random error = 2%M

agni

tude

Period (Minutes)0 1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930

2.94

2.96

2.98

3

3.02

3.04

3.06

3.08

Light Curve

0 1 2 3 4 5 6 7 8 9 10 11 122.94

2.96

2.98

3

3.02

3.04

3.06

Period (Days)

Mag

nitu

de

Period

0 2 4 6 8 10 Period (days)

1

.9

.8

Thet

a

HIP 19859

Target Star

HIP 19859 Light Curve

2455980 2455985 2455990 2455995 2456000 2456005 2456010 24560152.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3

Date (HJD)

Rel

ativ

e M

agni

tude

HIP 19859 Period

0 2 4 6 8 10

Period (Days)

1

.8

.6

.4

.2

Thet

a

Problems and Difficulties

Weather

Technical Issues

Errors

Catalina Sky Survey

Catalina Sky Survey

Started in 2005

Searching for near Earth objects

Photometry on 198 million objects

HIP 3998 Light Curve

PDM

.4 .6 .8 1 Period (Days)

1.5

1

.95

.9

.85

Thet

a

Comparing Ages

Collected ages from published papers

Gyrochonology equation P(B-V,t) = f(B-V) * g(t)

Where f(B-V) = (0.7725 ± 0.011) (B-V0-0.4)0.601±0.024

And g(t)=t0.5189±0.0070

Thanks

NASA Space Grant

Northern Arizona University

Dr. Koerner

Dr. Barlow and Kathleen Stigmon