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Time resolved spectroscopy of KPD1930+2752
S. Geier, U. Heber, N. Przybilla +1
We present the analysis of 200 high-resolution and 150 low-resolution spectra of the pulsating subdwarf close binary KPD 1930+2752 obtained with the Keck and the Calar Alto 2.2 m t…
The Araucaria Project: The Distance to NGC 300 from the Red Giant Branch Tip using HST/ACS imaging
Luca Rizzi, Fabio Bresolin, Rolf-Peter Kudritzki +2
We have used the Advanced Camera for Surveys on board the Hubble Space Telescope to obtain deep photometry of the NGC 300 spiral galaxy in the Sculptor group. The results have been…
High Spectral Resolution Observations of the Massive Stars in the Galactic Center
Angelle Tanner, Donald F. Figer, Paco Najarro +10
We present high-resolution near-infrared spectra, obtained with the NIRSPEC spectrograph on the W. M. Keck II Telescope, of a collection of hot, massive stars within the central 25…
The Araucaria Project: The effect of blending on the Cepheid distance to NGC 300 from Advanced Camera for Surveys images
Fabio Bresolin, Grzegorz Pietrzynski, Wolfgang Gieren +1
We have used the Advanced Camera for Surveys aboard the Hubble Space Telescope to obtain F435W, F555W and F814W single-epoch images of six fields in the spiral galaxy NGC 300. Taki…
A Medium Resolution Near-Infrared Spectral Atlas of O and Early B Stars
M. M. Hanson, R. -P. Kudritzki, M. A. Kenworthy +2
We present intermediate resolution (R ~ 8,000 - 12,000) high signal-to-noise H- and K-band spectroscopy of a sample of 37 optically visible stars, ranging in spectral type from O3…
The VLT-FLAMES Survey of Massive Stars: Observations in the Galactic Clusters NGC 3293, NGC 4755 and NGC 6611
C. J. Evans, S. J. Smartt, J. -K. Lee +23
We introduce a new survey of massive stars in the Galaxy and the Magellanic Clouds using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument at the Very Large Tele…