Constraints on the star formation history of the Large Magellanic Cloud

Abstract

We present the analysis of deep colour-magnitude diagrams (CMDs) of 6 stellar fields in the LMC. The data were obtained using HST/WFPC2 in the I and V filters, reaching V=26.5. We discuss and apply a method of correcting CMDs for photometric incompleteness. A method to generate artificial CMDs based on a model star formation history is also developed. This method incorporates photometric error effects, unresolved binaries, reddening and allows use of different forms of the initial mass function and of the SFH itself. We use the Partial Models Method, as presented by Gallart and others, for CMD modelling, and include control experiments to prove its validity in a search for constraints on the Large Magellanic Cloud star formation history in different regions. Reliable star formation histories for each field are recovered by this method. In all fields, a gap in star formation with t=700 Myrs is observed. Field-to-field variations have also been observed. The two fields near the LMC bar present some significant star forming events, having formed both young (t < 1Gyr) and old (t > 10 Gyrs) stars, with a clear gap from 3-6 Gyrs. Two other fields display quite similar SFHs, with increased star formation having taken place at t=2-3 Gyrs and 6 < t < 10 Gyrs. The remaining two fields present star formation histories closer to uniform, with no clear event of enhanced star formation.

arXiv comment16 pages, 14 figures, A&A (2005) in press

References in corpus (19)

• Evolutionary tracks and isochrones for low- and intermediate-mass stars: from 0.15 to 7 M_sun, and from Z=0.0004 to 0.03
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• The Star Formation History of the Local Group dwarf galaxy Leo I
• Observations and Implications of the Star Formation History of the LMC
• Non-parametric star formation histories for 5 dwarf spheroidal galaxies of the local group
• The Star Formation History and the spatial distribution of stellar populations in the Ursa Minor Dwarf Spheroidal Galaxy
• Mass segregation in young compact star clusters in the Large Magellanic Cloud: II. Mass Functions
• The Star Formation History and the Morphological Evolution of the Draco Dwarf Spheroidal Galaxy
• The Star Formation History of the Large Magellanic Cloud
• Star Formation Histories from HST Color-Magnitude Diagrams of Six Fields of the LMC
• Parameter Estimation in Astronomy with Poisson-Distributed Data. I. The Chi-Square-Gamma Statistic
• Stellar Populations in Three Outer Fields of the LMC
• Ages and Metallicities of Star Clusters and Surrounding Fields in the Outer Disk of the Large Magellanic Cloud
• Deriving star formation histories: Inverting HR diagrams through a variational calculus maximum likelihood method
• Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831
• HST Observations of the Field Star Population in the Large Magellanic Cloud
• Young star clusters in the Large Magellanic Cloud: NGC 1805 and NGC 1818
• The Metal-rich Globular Cluster NGC6553: Observations with WFPC2, STIS, and NICMOS

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