Observations and Models of the Eclipsing Binary System KR Persei Público

Abstract

Abstract

KR Persei (KR Per) [RA: 04 37 09, Dec: +44 12 40 JD 2000], a detached eclipsing binary star system located in the constellation Perseus, is the subject of this thesis. Previous research performed on KR Per, conducted in 1985 by Chen et. al, identified various astronomical quantities for KR Per. While Chen et. al appear to have calculated many astronomical parameters, reevaluation using newer models in this current study suggests not all may be accurate. Based on the observations performed at Emory University in Atlanta, GA, USA, from September 2010 to February 2011, KR Per does not appear to have an eccentricity of 0.009 or a longitude of periastron of 160^o. Furthermore, the stellar classification of both components as F5V appears to be inaccurate and a stellar classification of G8 seems more likely. Finally, there is a strong possibility of a multiple reflection effect in KR Per determined by non-standard shoulder regions of the light curves. If this multiple reflection effect does exist, the primary component must have a large convective zone, while the secondary star must have a large radiative zone.

Table of Contents

Table of Contents

1 Introduction ...................................................................................................................................... 1

2 Binary Star Systems and Astronomical Measurements ............................................................................. 3

Observations and Classifications of Binary Star Systems .................................................................... 3

Astronomical Quantities ................................................................................................................ 5

Physical Classifications of Binary System ......................................................................................... 6

Naming Conventions ..................................................................................................................... 7

Stellar Spectra and Radial Velocity Curves ....................................................................................... 8

Phases of Variable Star's Orbit ....................................................................................................... 9

Stellar Classification and HR Diagram ............................................................................................. 10

Measuring Brightness ................................................................................................................... 11

Measuring Time ........................................................................................................................... 11

Time of Minima and O-C Diagram ................................................................................................... 12

3 Observational Methods and Photometry ................................................................................................ 13

Observational Methods .................................................................................................................. 13

Johnson/Bessel Filter Set ............................................................................................................... 15

Photometry .................................................................................................................................. 16

4 Observations of KR Persei .................................................................................................................... 17

Research Background .................................................................................................................... 17

Observations ................................................................................................................................ 17

Minimum Timings and O-C Diagram ................................................................................................. 19

Results ........................................................................................................................................ 23

Light Curve and Modeling ............................................................................................................... 24

5 Discussions and Conclusions ................................................................................................................ 32

References ........................................................................................................................................... 39

About this Honors Thesis

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School	Emory College
Department	Physics and Astronomy
Degree	BS
Submission	Honors Thesis
Language	English
Research Field	Physics, General Physics, Astronomy and Astrophysics
Palabra Clave	physics astronomy variable star binary star astrophysics eclipsing binary KR Persei
Committee Chair / Thesis Advisor	Williamon, Richard, Emory University
Committee Members	Dale III, Horace, Emory University Stewart, Scott A, Emory University

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