CY Aqr, GP And, and BP Peg短週期變星的光度分析

The photometry of three variable stars with Short Period: CY Aqr, GP And, and BP Peg

李奇欣

指導教授 ： 傅學海

國立臺灣師範大學/理學院/地球科學系/碩士(2009年)

摘要

本次的研究，包含GP And, BP Peg, 和 CY Aqr等三顆變星最大亮度值的新觀測。並對每一顆變星些微的週期變化作光度曲線的分析。
較大震幅類型的盾牌座型變星GP And，脈動週期變化由O-C圖所導出新公式為Cnew ＝ 2433861.5146＋0.0786829154 × E＋4.6 × 10-13 × E2

討論矮造父型變星BP Peg的光度觀測。由O-C圖推算出新的基調週期為0.10954410天。
而較長週期變化的變星 CY Aqr透過O-C圖的分析所得的週期為0.061038323天。CY Aqr受光與時間影響後的雙星參數值變化, 由CY Aqr的O-C圖推得K = 0.006, Porb = 49.8 years, e = 0.7, ω = -38.9 and 。

關鍵字

光度曲線 ； 變星 ； 脈動週期

並列摘要

In this work, the observations present new times of maximum light with three variable stars in this investigation include GP And, BP Peg, and CY Aqr. The analysis of the light curve for each of the variables were showed small period changes.
The pulsation period variability of the high-amplitude delta Scuti star GP And in the O-C curve is inferred new formula 
Photometric observations of the dwarf Cepheid BP Peg are discussed. The new derived in the O-C curve for the fundamental period is 0.10954410d.
With the analysis of O-C diagram showed the long-term period change of CY Aqr for period is 0.061038323d. And the binary constant of CY Aqr to the light-time effect procedure could be inference, K = 0.006, Porb = 49.8 years, e = 0.7, ω= -38.9 and  to fit CY Aqr’s O-C diagram.

並列關鍵字

light curve ； varible star ； pulsation period

參考文獻

Agerer, F., and Hubscher, J.,1998, IBVS, No. 4606

Agerer, F., and Hubscher, J.,2003, IBVS, No. 5485

Ashbrook, J., 1949, CY Aquarii, AJ, 54,168.

Ashbrook, J., 1954, AJ, 59, 6

Breger, M 1980, APJ, 253, 135