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The Physical Properties and Effective Temperature Scale of O-type Stars as a Function of Metallicity. III. More Results from the Magellanic Clouds
Philip Massey, Amanda M. Zangari, Nidia I. Morrell +4
In order to better determine the physical properties of hot, massive stars as a function of metallicity, we obtained very high SNR optical spectra of 26 O and early B stars in the…
Do the photometric colors of Type II-P Supernovae allow accurate determination of host galaxy extinction?
Kevin Krisciunas, Mario Hamuy, Nicholas B. Suntzeff +10
We present infrared photometry of SN 1999em, plus optical photometry, infrared photometry, and optical spectroscopy of SN 2003hn. Both objects were Type II-P supernovae. The V-[RIJ…
A New Distance to The Antennae Galaxies (NGC 4038/39) Based on the Type Ia Supernova 2007sr
Francois Schweizer, Christopher R. Burns, Barry F. Madore +13
Traditionally, the distance to NGC 4038/39 has been derived from the systemic recession velocity, yielding about 20 Mpc for H_0 = 72 km/s/Mpc. Recently, this widely adopted distanc…
A Three-Decade Outburst of the LMC Luminous Blue Variable R127 Draws to a Close
Nolan R. Walborn, Otmar Stahl, Roberto C. Gamen +7
The paradigmatic Luminous Blue Variable R127 in the Large Magellanic Cloud has been found in the intermediate, peculiar early-B state, and substantially fainter in visual light, si…
A Spectroscopic Survey of WNL Stars in the LMC: General Properties and Binary Status
O. Schnurr, A. F. J. Moffat, N. St-Louis +2
We report the results of an intense, spectroscopic survey of all 41 late-type, nitrogen-rich Wolf-Rayet (WR) stars in the Large Magellanic Cloud (LMC) observable with ground-based…
Spectroscopic monitoring of Southern Galactic O and WN stars: State of the Art in 2007
R. Gamen, R. Barba, N. Morrell +5
We are conducting a spectroscopic monitoring of O and WN -type stars in our Galaxy. In this work, we summarize some of our first results related to the search for radial-velocity v…
The Massive Star Content of NGC 3603
Nicholas W. Melena, Philip Massey, Nidia I. Morrell +1
We investigate the massive star content of NGC 3603, the closest known giant H II region. We have obtained spectra of 26 stars in the central cluster using the Baade 6.5-m telescop…