We present an analysis of the predictions made by the GALFORM semi-analytic galaxy formation model for the evolution of the relationship between stellar mass and halo mass. We show that for the standard implementations of supernova feedback and gas reincorporation used in semianalytic models, this relationship is predicted to evolve weakly over the redshift range 0 < z < 4. Modest evolution in ...

The stellar evolution code YREC is outlined with emphasis on its applications to helioand asteroseismology. The procedure for calculating calibrated solar and stellar models is described. Other features of the code such as a non-local treatment of convective core overshoot, and the implementation of a parametrized description of turbulence in stellar models, are considered in some detail. The c...

We describe a long term project aimed at deriving information on the chemical evolution of the Galactic disk from a large sample of open clusters. The main property of this project is that all clusters are analyzed in a homogeneous way, to guarantee the robustness of the ranking in age, distance and metallicity. Special emphasis is devoted to the evolution of the earliest phases of the Galactic...

We present the results of a 25-year program to monitor the radio flux evolution of the planetary nebula NGC 7027. We find significant evolution of the spectral flux densities. The flux density at 1465 MHz, where the nebula is optically thick, is increasing at a rate of 0.251 ± 0.015%yr, caused by the expansion of the ionized nebula. At frequencies where the emission is optically thin, the spect...

We study the late evolution of solar metallicity stars in the transition region between white dwarf formation and core collapse. This includes the super-asymptotic giant branch (super-AGB, SAGB) stars, which have massive enough cores to ignite carbon burning and form an oxygen-neon (ONe) core. The most massive SAGB stars have cores that may grow to the Chandrasekhar mass because of continued sh...

We use very deep near-infrared (NIR) imaging data obtained in MOIRCS Deep Survey (MODS) to investigate the evolution of the galaxy stellar mass function back to z ∼ 3. The MODS data reach J = 24.2, H = 23.1, K = 23.1 (5σ, Vega magnitude) over 103 arcmin (wide) and J = 25.1, H = 23.7, K = 24.1 over 28 arcmin (deep) in the GOODS-North region. The wide and very deep NIR data allow us to measure th...

We present an analysis of the stellar mass growth over the last 10 Gyr (z ≤ 2) using a unique large sample of galaxies selected at 3.6 μm. We have assembled accurate photometric and spectroscopic redshifts for ∼21 200 and 1500 galaxies, respectively, with F(3.6 μm) ≥ 9.0 μJy by combining data from Spitzer-SWIRE IRAC, the VIMOS VLT Deep Survey (VVDS), UKIDSS and very deep optical CFHTLS photomet...

I will review recent progress in the modeling of the stellar spectral energy distributions of star-forming galaxies. I will cover the full relevant wavelength range from the near-infrared to the extreme ultraviolet, with an emphasis on the ultraviolet longand shortward of the Lyman break where most of the stellar luminosity is emitted. Uncertainties in stellar atmosphere and evolution models wi...

The relationship of an AGN to its host galaxy is a crucial question in the study of galaxy evolution. We perform stellar population synthesis in the central regions of galaxies of different activity levels. A large number of stellar features are measured both in the optical and near-infrared. We find the nuclear stellar population to be related to the level of activity. These differences are no...

We explore the motivation behind large stellar surveys in Galactic astronomy, in particular, surveys that measure the photometric, phase space and abundance properties of thousands or millions of stars. These observations are essential to unravelling the sequence of events involved in galaxy formation and evolution, although disentangling key signatures from the complexity continues to be very ...