VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 225 Article Swipe

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Young‐Beom Jeon , Yoon-Ho Park , Sangmin Lee ·

YOU? · · 2016 · Open Access · · DOI: https://doi.org/10.5303/pkas.2016.31.3.043

Through time-series BV CCD photometry of the open cluster NGC 225 region, we have detected 30 variable stars including 22 new ones. They are five ${\delta}$ Scuti-type variable stars, a slowly pulsating B star, six eclipsing binary stars and 18 semi-long periodic or slow irregular variables, respectively. We have performed multiple-frequency analysis to determine pulsation frequencies of the ${\delta}$ Scuti-type stars and a slowly pulsating B star, using the discrete Fourier transform and linear least-square fitting methods. We also have derived the periods and amplitudes of 6 eclipsing binaries and a long-period variable star from the phase fitting method, and presented the light curves of all variable stars. A slowly pulsating B star is a member of NGC 225, but ${\delta}$ Scuti-type stars are not members from the positions in the color-magnitude diagram and the radial distancies from the center of the cluster. From Dias et al. (2014, A&A, 564, 79), only three variable stars including the slowly pulsating B star are members of clusters: two are in NGC 225 and one is in Stock 24. But a variable star in Stock 24 is not a member of the cluster because of its position of color-magnitude diagarm.

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Physics Astrophysics Variable star Stars Photometry (optics) Blue straggler Light curve Open cluster Amplitude Astronomy Hertzsprung–Russell diagram Star cluster Stellar evolution Quantum mechanics

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Type: article
Language: en
Landing Page: https://doi.org/10.5303/pkas.2016.31.3.043
PDF: http://society.kisti.re.kr/sv/SV_svpsbs03V.do?method=download&cn1=JAKO201606776005453
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DOI: https://doi.org/10.5303/pkas.2016.31.3.043

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Title: VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER NGC 225

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Language: en

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Publication year: 2016

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Publication date: 2016-12-31

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Authors: Young‐Beom Jeon, Yoon-Ho Park, Sangmin Lee

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Landing page: https://doi.org/10.5303/pkas.2016.31.3.043

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Concepts: Physics, Astrophysics, Variable star, Stars, Photometry (optics), Blue straggler, Light curve, Open cluster, Amplitude, Astronomy, Hertzsprung–Russell diagram, Star cluster, Stellar evolution, Quantum mechanics

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