Publications de Martin Tafelmeyer

Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans (vol 524, pg A58, 2010)

Pascale Jablonka, Pierre North, Martin Tafelmeyer

2011

Direct detection of galaxy stellar halos: NGC 3957 as a test case

Frédéric Courbin, Pascale Jablonka, Martin Tafelmeyer

We present a direct detection of the stellar halo of the edge-on S0 galaxy NGC 3957, using ultra-deep VLT/VIMOS V and R images. This is achieved with a sky subtraction strategy based on infrared techniques. These observations allow us to reach unprecedente ...

2010

Extremely metal-poor stars in classical dwarf spheroidal galaxies: Fornax, Sculptor, and Sextans

Pascale Jablonka, Pierre North, Martin Tafelmeyer

We present the results of a dedicated search for extremely metal-poor stars in the Fornax, Sculptor, and Sextans dSphs. Five stars were selected from two earlier VLT/Giraffe and HET/HRS surveys and subsequently followed up at high spectroscopic resolution ...

2010

Dwarf Galaxies and Galaxy Halos : the First Stages of Galaxy Evolution

Martin Tafelmeyer

The various projects presented in this thesis contribute to the expansion of our knowledge and understanding of the fundamental processes involved in the formation of a galaxy and its stellar populations. For this purpose, two different techniques are appl ...

EPFL2010

The NIR Ca II triplet at low metallicity Searching for extremely low-metallicity stars in classical dwarf galaxies

Pascale Jablonka, Martin Tafelmeyer

The NIR Ca II triplet absorption lines have proven to be an important tool for quantitative spectroscopy of individual red giant branch stars in the Local Group, providing a better understanding of metallicities of stars in the Milky Way and dwarf galaxies ...

2010

Chemical composition of extremely metal-poor stars in the Sextans dwarf spheroidal galaxy

Pascale Jablonka, Martin Tafelmeyer

Context. Individual stars in dwarf spheroidal galaxies around the Milky Way Galaxy have been studied both photometrically and spectroscopically. Extremely metal-poor stars among them are very valuable because they should record the early enrichment in the ...

2009