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Determination of Fundamental Properties of an M31 Globular Cluster from Main-Sequence Photometry
Ma, Jun1; Wu, Zhenyu; Wang, Song2; Fan, Zhou; Zhou, Xu; Wu, Jianghua; Jiang, Zhaoji; Chen, Jiansheng
2010-10-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volume122Issue:896Pages:1164-1170
AbstractM31 globular cluster B379 is the first extragalactic cluster whose age was determined by main-sequence photometry. In the main-sequence photometric method, the age of a cluster is obtained by fitting its color-magnitude diagram (CMD) with stellar evolutionary models. However, different stellar evolutionary models use different parameters of stellar evolution, such as range of stellar masses, different opacities and equations of state, and different recipes, and so on. So, it is interesting to check whether different stellar evolutionary models can give consistent results for the same cluster. Brown et al. constrained the age of B379 by comparing its CMD with isochrones of the 2006 VandenBerg models. Using SSP models of Bruzual & Charlot and its multiphotometry, ZMa et al. independently determined the age of B379, which is in good agreement with the determination of Brown et al. The models of Bruzual & Charlot are calculated based on the Padova evolutionary tracks. It is necessary to check whether the age of B379 as determined based on the Padova evolutionary tracks is in agreement with the determination of Brown et al.. In this article, we redetermine the age of B379 using isochrones of the Padova stellar evolutionary models. In addition, the metal abundance, the distance modulus, and the reddening value for B379 are reported. The results obtained are consistent with the previous determinations, which include the age obtained by Brown et al. This article thus confirms the consistency of the age scale of B379 between the Padova isochrones and the 2006 VandenBerg isochrones; i.e., the comparison between the results of Brown et al. and ZMa et al. is meaningful. The results reported in this article of values found for B379 are: metallicity [M/H] = logd (Z/Z(circle dot)) = -0.325, age tau 11.0 +/- 1.5 Gyr, reddening E(B-V) = 0.08, and distance modulus (m - M)(0) 24.44 +/- 0.10.
Indexed BySCI
Language英语
WOS IDWOS:000282373400002
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7820
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Ma, Jun,Wu, Zhenyu,Wang, Song,et al. Determination of Fundamental Properties of an M31 Globular Cluster from Main-Sequence Photometry[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2010,122(896):1164-1170.
APA Ma, Jun.,Wu, Zhenyu.,Wang, Song.,Fan, Zhou.,Zhou, Xu.,...&Chen, Jiansheng.(2010).Determination of Fundamental Properties of an M31 Globular Cluster from Main-Sequence Photometry.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,122(896),1164-1170.
MLA Ma, Jun,et al."Determination of Fundamental Properties of an M31 Globular Cluster from Main-Sequence Photometry".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 122.896(2010):1164-1170.
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