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Simple stellar population models including blue stragglers
Xin, Yu1; Deng, Licai2; de Grijs, Richard3; Kroupa, Pavel1
2011-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume411Issue:2Pages:761-775
AbstractObservations show that nearly all star clusters and stellar populations contain blue straggler stars (BSs). BSs in a cluster can significantly enhance the integrated spectrum of the host population, preferentially at short wavelengths, and render it much bluer in photometric colours. Current theoretical simple stellar population (SSP) models constructed within the traditional framework of single and binary stellar evolution cannot fully account for the impact of these objects on the integrated spectral properties of stellar populations. Using conventional SSP models without taking into account BS contributions may significantly underestimate a cluster's age and/or metallicity, simply because one has to balance the observed bluer colours (or a bluer spectrum) with a younger age and/or a lower metallicity. Therefore, inclusion of BS contributions in SSP models is an important and necessary improvement for population synthesis and its applications. Here, we present a new set of SSP models, which include BS contributions based on our analysis of individual star clusters. The models cover the wavelength range from 91 A to 160 mu m, ages from 0.1 to 20 Gyr and metallicities Z = 0.0004, 0.004, 0.008, 0.02 (solar) and 0.05. We use the observed integrated spectra of several Magellanic Cloud star clusters to cross-check and validate our models. The results show that the age predictions from our models are closer to those from isochrone fitting in the clusters' colour-magnitude diagrams compared to age predictions based on standard SSP models.
KeywordBlue Stragglers Magellanic Clouds Galaxies: Star Clusters: General
DOI10.1111/j.1365-2966.2010.17714.x
Indexed BySCI
Language英语
WOS IDWOS:000286988800002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7867
Collection光学天文研究部
Affiliation1.Univ Bonn, Argelander Inst Astron Sternwarte, D-53121 Bonn, Germany
2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Xin, Yu,Deng, Licai,de Grijs, Richard,et al. Simple stellar population models including blue stragglers[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,411(2):761-775.
APA Xin, Yu,Deng, Licai,de Grijs, Richard,&Kroupa, Pavel.(2011).Simple stellar population models including blue stragglers.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,411(2),761-775.
MLA Xin, Yu,et al."Simple stellar population models including blue stragglers".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 411.2(2011):761-775.
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