Css j213934.3-050020: A new double-mode high-amplitude δ scuti-type pulsating star
Publications of the Astronomical Society of the Pacific, ISSN: 0004-6280, Vol: 133, Issue: 1023
2021
- 4Citations
- 3Captures
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Article Description
CSS J213934.3-050020 (hereafter J213934) was originally found as an EW-type eclipsing binary star with a period of 0.225456 days by Catalina Real-time Transient Survey. With the stellar atmospheric parameters from the LAMOST, it is found that the temperature is much higher than those of normal EW-type binaries and does not follow the period–temperature relation of EW-type eclipsing binary stars. To study the physical properties of the variable star, new B and V light curves were obtained by using the 70 cm telescope at the Lijiang station of Yunnan Observatories. It is detected that this variable star is a high-amplitude δ Scuti-type pulsating star rather than an EW-type eclipsing binary. On the log g–T diagram, J213934 lies inside the classical Cepheid instability strip where most δ Scuti stars are located. The results of pulsating frequency analysis show the fundamental frequency f = 6.8195 day, the first overtone f = 8.8709 day and 4 harmonics or linear combinations. The mass of J213934 is estimated as-0.27 1.83 M⊙. The period is revised as 0.11272960 days by using 16 new determined times of light maximum. Meanwhile, it is discovered that its O − C curve shows an upward parabolic variation and a sinusoidal variation. The upward parabolic variation may be a part of a cyclic change or a long-time pulsation period increase caused by its evolution. The sinusoidal variation may be caused by the light-travel-time effect via the presence of a companion star.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85106738234&origin=inward; http://dx.doi.org/10.1088/1538-3873/abf32a; https://iopscience.iop.org/article/10.1088/1538-3873/abf32a; https://dx.doi.org/10.1088/1538-3873/abf32a; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=53b057e9-313a-4228-8d7f-dfcd8d0fe6b7&ssb=33281220879&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F1538-3873%2Fabf32a&ssi=88e46fe4-8427-4426-b837-7e9880ce585f&ssk=support@shieldsquare.com&ssm=5065294332614791926171134787673908&ssn=0bdf0df1a87f65d7c99cb87139bf396d19760b7b87bb-6a56-4e1a-958a98&sso=37474623-dffaf0e63d781c714df0578354c78a3757469d2198feeb43&ssp=71149869121717955666171795695319269&ssq=03195246232288891515124453222321903661566&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJyZCI6ImlvcC5vcmciLCJ1em14IjoiN2Y5MDAwNGM0OGU2MzgtZjBlMy00MGExLTk4ZTgtYjczNzAzMWIzZDZmMS0xNzE3OTI0NDUzNTUzMzc4Njg0NjItNTk5MzkwOGYyMTEzM2JhOTI2MTciLCJfX3V6bWYiOiI3ZjYwMDA4YzA1MzYxOC1mNDMzLTQ3NWEtOWI4NC1jYTAwNWRlN2Q4MTUxNzE3OTI0NDUzNTUzMzc4Njg0NjItOWQ3Y2E5MDYxZjg2ZWE0MDI2MTcifQ==
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