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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2020
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57171663010 https://www.redalyc.org/journal/571/57171663010/ https://www.redalyc.org/journal/571/57171663010/html/ https://www.redalyc.org/journal/571/57171663010/57171663010.epub https://www.redalyc.org/journal/571/57171663010/movil |
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Table of Contents:
- Analysis of a short periodic pulsator: SX phoenicis star XX Cyg Mohamed Abdel-Sabour Ahmed Shokry Ahmed Ibrahim Física, Astronomía y Matemáticas Stars stars XX Cyg general evolution Photometric observations were made of the SX Phoenicis star XX Cyg between September and October 2019, using the 1.88-m Kottamia reflector telescope in Egypt. We used 340 CCD observations with blue-visible-red (BVR) filters to derive light curves. In addition, we obtained 9540 visual magnitudes for XX Cyg from the literature to prepare an observed-minus-calculated (O-C) diagram. 85 new times of maximum for XX Cyg are presented. We did not detect a bump in the descending portion of the light curve of maximum light for XX Cyg. However, we did detect a secular bump in the phased light curves, which changes with phase in some SuperWASP observations. We found the change in period of XX Cyg to be dP/dt = 15.5×10−5 s/yr, with its amplitude decreasing at a rate of 0.7 mmag/year. Stellar parameters of XX Cyg and its position in the instability strip of the Hertzsprung Russell stellar evolution diagram are presented. 2020 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57171663010 https://www.redalyc.org/journal/571/57171663010/ https://www.redalyc.org/journal/571/57171663010/html/ https://www.redalyc.org/journal/571/57171663010/57171663010.epub https://www.redalyc.org/journal/571/57171663010/movil 10.22201/ia.01851101p.2020.56.02.10 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.56