Brandt, Timothy D. and Huang, Chelsea X. 
ORCID: https://orcid.org/0000-0003-0918-7484
(2015)
Rotating Stellar Models Can Account for the Extended Main-sequence Turnoffs in Intermediate-age Clusters.
The Astrophysical Journal, 807 (1):25.
pp. 1-7.
ISSN 1538-4357
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Text (Published Version)
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Abstract
We show that the extended main-sequence turnoffs seen in intermediate-age Large Magellanic Cloud (LMC) clusters, often attributed to age spreads of several 100 Myr, may be easily accounted for by variable stellar rotation in a coeval population. We compute synthetic photometry for grids of rotating stellar evolution models and interpolate them to produce isochrones at a variety of rotation rates and orientations. An extended main-sequence turnoff naturally appears in color-magnitude diagrams at ages just under 1 Gyr, peaks in extent between ∼1 and 1.5 Gyr, and gradually disappears by around 2 Gyr in age. We then fit our interpolated isochrones by eye to four LMC clusters with very extended main-sequence turnoffs: NGC 1783, 1806, 1846, and 1987. In each case, stellar populations with a single age and metallicity can comfortably account for the observed extent of the turnoff region. The new stellar models predict almost no correlation of turnoff color with rotational v{sin}i. The red part of the turnoff is populated by a combination of slow rotators and edge-on rapid rotators, while the blue part contains rapid rotators at lower inclinations.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Published version deposited in accordance with the copyright policy of the publisher. |
| Faculty/School / Institute/Centre: | No Faculty |
| Faculty/School / Institute/Centre: | No Faculty |
| Date Deposited: | 31 Mar 2022 01:22 |
| Last Modified: | 31 Mar 2022 01:22 |
| Uncontrolled Keywords: | galaxies: clusters: general; galaxies: clusters: individual (NGC 1783, NGC 1806, NGC 1846, NGC 1987); Hertzsprung-Russell and C-M diagrams; Magellanic Clouds; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Astrophysics of Galaxies |
| Fields of Research (2020): | 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems |
| Identification Number or DOI: | https://doi.org/10.1088/0004-637x/807/1/25 |
| URI: | http://eprints.usq.edu.au/id/eprint/47436 |
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