| Variable Star Status of Two Stars:V204 and I-I-39 in M3 |
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| 作者姓名： | Bao-An Yao Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai |
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| 作者单位： | Bao-An Yao Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030; |
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| 摘 要： | The star I-I-42 (=vZ1390),a cluster member in M3,located near the red edge of the instability strip of the horizontal branch,was discovered by Roberts and Sandage as a low amplitude variable,it was designated as V204 in the "second catalogue of variable stars in globular clusters",but its coordinates given in all versions of this catalogue are wrong since 1955. We argue that V204 is indeed a low amplitude HB variable star,located near to the red edge of the instability strip,with a period of 0.74785d and an amplitude of about 0.04mag in V . We also find that the red cluster member star I-I-39 is a low amplitude variable with a period of 1.16d and amplitude of about 0.03mag in V which might be pulsating at the second overtone.
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| 关 键 词： | globular cluster — stars: variables — stars: individual (V204 and I-I-39) |
Variable Star Status of Two Stars: V204 and I-I-39 in M3 |
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| Bao-An Yao Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai ,.Variable Star Status of Two Stars:V204 and I-I-39 in M3[J].Chinese Journal of Astronomy and Astrophysics,2007,7(6):771-776. |
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| Authors: | Bao-An Yao |
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| Abstract: | The star I-I-42 (=vZ1390),a cluster member in M3,located near the red edge of the instability strip of the horizontal branch,was discovered by Roberts and Sandage as a low amplitude variable,it was designated as V204 in the "second catalogue of variable stars in globular clusters",but its coordinates given in all versions of this catalogue are wrong since 1955. We argue that V204 is indeed a low amplitude HB variable star,located near to the red edge of the instability strip,with a period of 0.74785d and an amplitude of about 0.04mag in V . We also find that the red cluster member star I-I-39 is a low amplitude variable with a period of 1.16d and amplitude of about 0.03mag in V which might be pulsating at the second overtone. |
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| Keywords: | globular cluster-stars: variables-stars: individual (V204 and I-I-39) |
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