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Stellar spectroscopy far beyond the Local Group
Fabio Bresolin, Rolf-Peter Kudritzki, Roberto H. Mendez +1
Multi-object spectroscopic observations of blue supergiants in NGC 3621, a spiral galaxy at a distance of 6.7 Mpc, carried out with the ESO VLT and FORS are presented. We demonstra…
An ionizing UV background dominated by massive stars
Martin G. Haehnelt, Piero Madau, Rolf P. Kudritzki +1
We discuss implications of a stellar-dominated UV background at high redshifts. The composite spectrum of 29 LBGs evaluated by Steidel etal (2000) at <z>=3.4 can be well fit by a s…
Chemical abundances and winds of massive stars in M31: a B-type supergiant and a WC star in OB10
S. J. Smartt, P. A. Crowther, P. L. Dufton +5
We present high quality spectroscopic data for two massive stars in the OB10 association of M31, OB10-64 (B0Ia) and OB10-WR1 (WC6). Medium resolution spectra of both stars were obt…
Generic Spectrum and Ionization Efficiency of a Heavy Initial Mass Function for the First Stars
Volker Bromm, Rolf P. Kudritzki, Abraham Loeb
We calculate the generic spectral signature of an early population of massive stars at high redshifts. For metal-free stars in the mass range of 100-1000 solar masses, we find that…
Analysis of Four A-F Supergiants in M31 from Keck HIRES Spectroscopy
Kim A. Venn, J. K. McCarthy, D. J. Lennon +3
The first stellar abundances in M31 are presented, based on Keck I HIRES spectroscopy and model atmospheres analyses of three A-F supergiants, 41-2368, 41-3712, and A-207. We also…
Discovery of 9 Ly alpha emitters at redshift z~3.1 using narrow-band imaging and VLT spectroscopy
R. P. Kudritzki, R. H. Mendez, J. J. Feldmeier +7
Narrow-band imaging surveys aimed at detecting the faint emission from the 5007 [O III] line of intracluster planetary nebulae in Virgo also probe high redshift z=3.1 Ly alpha emit…