CCD Photometry of Field RR Lyrae Stars. I. Period Changes of SV ERI and XX and
CCD time series photometry was performed for two Oosterhoff type II± field RR Lyrae stars, SV Eri and XX And, to construct light curves in B and V bands. The maximum light times from our observations were combined with those in the literature to construct phase shift diagrams, from which we determin...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Space Science Society (KSSS)
1996-06-01
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| Series: | Journal of Astronomy and Space Sciences |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/1996/v13n1/OJOOBS_1996_v13n1_1.pdf |
| Summary: | CCD time series photometry was performed for two Oosterhoff type II± field RR Lyrae stars, SV Eri and XX And, to construct light curves in B and V bands. The maximum light times from our observations were combined with those in the literature to construct phase shift diagrams, from which we determined the period change rates β. We obtained large positive period change rates for these stars, which are expected from current evolutionary models if these stars are evolving rapidly from blue to red toward the end of core helium burning phase. |
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| ISSN: | 2093-5587 2093-1409 |