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Pulsation Properties of Long Period Variable Stars in Globular Cluster NGC 6553

Kager, Elisabeth
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277148078

Abstract Details

2010, Master of Science (MS), Bowling Green State University, Physics.
Photometry for the metal-rich globular cluster NGC 6553 has been done and is presented in both V and I banpasses. A color magnitude diagram for this cluster was created which indicates the presence of two distinct giant branches that separate the cluster population from the field population at I = 12.2 mag. Time-series photometry is presented for 49 stars, 22 of which are considered cluster members. Cluster membership was found by locating them on the cluster giant branch. Ten of these 22 cluster members are new discoveries while the other twelve were found during a study done by Lloyed Evans and Menzies in 1972. Where possible, properties, such as average period, average amplitude, and the observed range of magnitudes of the variable star candidates are discussed. Lloyd Evans and Menzies did not investigate the stars' properties, but they provided generalized sub-classifications for them. Their findings included eleven irregular/semi-regular variables and one Mira variable. We, on the other hand, provide specific sub-classifiactions for the individual stars. Comparing our results of the same twelve stars to Lloyd Evans and Menzies', we find that we sub-classified them as ten irregular/semi-regular variables, one Mira variable, and one possible binary star system. We do not find a definite borderline between the irregular and the semi-regular variable star classes. Also, we have made the observation that there is no trend of sub-classes with respect to the position on the giant branch. This leads to the conclusion that there is no smooth transition from the position of irregular/semi-regular variables to the position occupied by Mira-type variables, but rather a sudden jump. This same phenomenon has been observed by Lebzelter and Wood in a paper published in 2005.
Andrew Layden (Advisor)
John Laird (Committee Member)
Dale Smith (Committee Member)
135 p.
Astronomy; Astrophysics; Physics
astronomy; observational; NGC 6553; globular cluster; metal-rich; variable stars; long period variable stars; mira; DAOPHOT; ALLSTAR; ALLFRAME; DAOMASTER; irregular; semi-regular; pulsation; ;

Recommended Citations

Citations

  • Kager, E. (2010). Pulsation Properties of Long Period Variable Stars in Globular Cluster NGC 6553 [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277148078

    APA Style (7th edition)

  • Kager, Elisabeth. Pulsation Properties of Long Period Variable Stars in Globular Cluster NGC 6553. 2010. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277148078.

    MLA Style (8th edition)

  • Kager, Elisabeth. "Pulsation Properties of Long Period Variable Stars in Globular Cluster NGC 6553." Master's thesis, Bowling Green State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277148078

    Chicago Manual of Style (17th edition)

bgsu1277148078
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This open access ETD is published by Bowling Green State University and OhioLINK.