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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731953.0, MPI für Astronomie / Publikationen_mpia
A young cluster with an extended main-sequence turnoff: confirmation of a prediction of the stellar rotation scenario
Authors:Bastian, N.; Niederhofer, F.; Kozhurina-Platais, V.; Salaris, M.; Larsen, S.; Cabrera-Ziri, I.; Cordero, M.; Ekström, S.; Geisler, D.; Georgy, C.; Hilker, M.; Kacharov, N.; Li, C.; Mackey, D.; Mucciarelli, A.; Platais, I.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:L20
End Page:L24
Audience:Not Specified
Abstract / Description:We present Hubble Space Telescope photometry of NGC 1850, a ˜100 Myr, ˜105 M cluster in the Large Magellanic Cloud. The colour-magnitude diagram clearly shows the presence of an extended main-sequence turnoff (eMSTO). The use of non-rotating stellar isochrones leads to an age spread of ˜40 Myr. This is in good agreement with the age range expected when the effects of rotation in the main-sequence turnoff (MSTO) stars are wrongly interpreted in terms of age spread. We also do not find evidence for multiple, isolated episodes of star formation bursts within the cluster, in contradiction to scenarios that invoke actual age spreads to explain the eMSTO phenomenon. NGC 1850 therefore continues the trend of eMSTO clusters, where the inferred age spread is proportional to the age of the cluster. While our results confirm a key prediction of the scenario where stellar rotation causes the eMSTO feature, direct measurements of the rotational rate of MSTO stars is required to definitively confirm or refute whether stellar rotation is the origin of the eMSTO phenomenon or if it is due to an as yet undiscovered effect.
Free Keywords:galaxies: star clusters: individual: NGC 1850
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnrasl/slw067
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