SN 2003bg: The First Type IIb Hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
Optical and near-infrared photometry and optical spectroscopy are reported for SN 2003bg, starting a few days after explosion and extending for a period of more than 300 days. Our early-time spectra...
Spectroscopic study of the N159/N160 complex in the Large Magellanic Cloud (2009)
Fariña, Cecilia, Bosch, Guillermo L., Morrell, Nidia I., Barbá, Rodolfo H., Walborn, Nolan R.
We present a spectroscopic study of the N159/N160 massive-star forming region south of 30 Doradus in the Large Magellanic Cloud, classifying a total of 189 stars in the field of the complex. Most of...
Supernova 2003bg: the first type IIb hypernova (2009)
Hamuy, Mario, Deng, Jinsong, Mazzali, Paolo A., Morrell, Nidia I., Phillips, Mark M., Roth, Miguel, ...
Massey, Philip, Zangari, Amanda M., Morrell, Nidia I., Puls, Joachim, DeGioia-Eastwood, Kathleen, Bresolin, Fabio, ...
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 Magellanic Clouds....
A New Distance to The Antennae Galaxies (NGC 4038/39) Based on the Type Ia Supernova 2007sr (2008)
Schweizer, Francois, Burns, Christopher R., Madore, Barry F., Mager, Violet A., Phillips, M. M., Freedman, Wendy L., ...
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 distance has been...
A Three-Decade Outburst of the LMC Luminous Blue Variable R127 Draws to a Close (2008)
Walborn, Nolan R., Stahl, Otmar, Gamen, Roberto C., Szeifert, Thomas, Morrell, Nidia I., Smith, Nathan, ...
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, signaling the final...
The Massive Star Content of NGC 3603 (2007)
Melena, Nicholas W., Massey, Philip, Morrell, Nidia I., Zangari, Amanda M.
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 telescope (Magellan I). Of...
Pre-main sequence stars in the Lagoon Nebula (M8) (2006)
Arias, Julia I., Barba, Rodolfo H., Morrell, Nidia I.
We report the discovery of new pre-main sequence (PMS) stars in the Lagoon Nebula (M8) at a distance of 1.25 kpc, based on intermediate resolution spectra obtained with the Boller & Chivens...
Limits to Transits of the Neptune-mass planet orbiting Gl 581 (2006)
Lopez-Morales, Mercedes, Morrell, Nidia I., Butler, R. Paul, Seager, Sara
We have monitored the Neptune-mass exoplanet-hosting M-dwarf Gl 581 with the 1m Swope Telescope at Las Campanas Observatory over two predicted transit epochs. A neutral density filter centered at...
The Carnegie Supernova Project: The low-redshift survey (2006)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
The Carnegie Supernova Project: The Low-Redshift Survey (2005)
Hamuy, Mario, Folatelli, Gastón, Morrell, Nidia I., Phillips, Mark M., Suntzeff, Nicholas B., Persson, S. E., ...
Supernovae are essential to understanding the chemical evolution of the Universe. Type Ia supernovae also provide the most powerful observational tool currently available for studying the expansion...
A CNO Dichotomy among O2 Giant Spectra in the Magellanic Clouds (2004)
Walborn, Nolan R., Morrell, Nidia I., Howarth, Ian D., Crowther, Paul A., Lennon, Daniel J., Massey, Philip, ...
From a survey of the 3400 A region in the earliest O-type spectra, we have found that two of the four O2 giants observed in the LMC have the OIV lines there stronger than the NIV, while the other two...
Marchenko, Sergey V, Rauw, Grégor, Antokhina, Eleonora A, Antokhin, Igor I, Ballereau, Dominique, Chauville, Jacques, ...
With the objective of investigating the wind-wind collision phenomenon and supporting contemporaneous X-ray observations, we have organized a large-scale, coordinated optical monitoring campaign of...