161 citations · 694 across the 9 of their papers we have counts for
9 papers
Red Supergiants as Cosmic Abundance Probes: The Sculptor Galaxy NGC 300
J. Zachary Gazak, Rolf Kudritzki, Chris Evans +9
We present a quantitative spectroscopic study of twenty-seven red supergiants in the Sculptor Galaxy NGC 300. J-band spectra were obtained using KMOS on the VLT and studied with st…
Red Supergiants as Cosmic Abundance Probes: The Magellanic Clouds
Ben Davies, Rolf-Peter Kudritzki, Zach Gazak +4
Red Supergiants (RSGs) are cool (~4000K), highly luminous stars (L - 10^5 Lsun), and are among the brightest near-infrared (NIR) sources in star-forming galaxies. This makes them p…
Red Supergiant Stars as Cosmic Abundance Probes. III. NLTE effects in J-band Magnesium lines
Maria Bergemann, Rolf-Peter Kudritzki, Zach Gazak +2
Non-LTE calculations for Mg I in red supergiant stellar atmospheres are presented to investigate the importance of non-LTE for the formation of Mg I lines in the NIR J-band. Recent…
A Direct Stellar Metallicity Determination in the Disk of the Maser Galaxy NGC4258
Rolf-Peter Kudritzki, Miguel A. Urbaneja, J. Zachary Gazak +4
We present the first direct determination of a stellar metallicity in the spiral galaxy NGC4258 (D=7.6 Mpc) based on the quantitative analysis of a low-resolution (~5 AE) Keck LRIS…
<3D> NLTE line formation in the atmospheres of red supergiants
Maria Bergemann, Rolf P. Kudritzki, Ben Davies +3
Red supergiants with their enormous brightness at J-band are ideal probes of cosmic chemical composition. It is therefore crucial to have realistic models of radiative transfer in…
The temperatures of Red Supergiants
Ben Davies, Rolf-Peter Kudritzki, Bertrand Plez +6
We present a re-appraisal of the temperatures of Red Supergiants (RSGs) using their optical and near-infrared spectral energy distributions (SEDs). We have obtained data of a sampl…
Red Supergiant Stars as Cosmic Abundance Probes: II. NLTE Effects in J-band Silicon Lines
Maria Bergemann, Rolf-Peter Kudritzki, Matthias Wueurl +3
Medium resolution J-band spectroscopy of individual red supergiant stars is a promising tool to investigate the chemical composition of the young stellar population in star forming…
Red Supergiant Stars as Cosmic Abundance Probes: NLTE Effects in J-band Iron and Titanium Lines
Maria Bergemann, Rolf-Peter Kudritzki, Bertrand Plez +3
Detailed non-LTE calculations for red supergiant stars are presented to investigate the influence of NLTE on the formation of atomic iron and titanium lines in the J-band. With the…
Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient and Distance
R. -P. Kudritzki, M. A. Urbaneja, Z. Gazak +4
The quantitative spectral analysis of low resolution Keck LRIS spectra of blue supergiants in the disk of the giant spiral galaxy M81 is used to determine stellar effective tempera…