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Unburned Material in the Ejecta of Type Ia Supernovae
Gastón Folatelli, M. M. Phillips, Nidia Morrell +17
(Abridged) The presence of unburned material in the ejecta of normal Type Ia supernovae (SNeIa) is investigated using early-time spectroscopy obtained by the CSP. The tell-tale sig…
Wind structure and luminosity variations in the WR/LBV HD 5980
Leonid N Georgiev, Gloria Koenigsberger, D John Hillier +3
Over the past 40 years, the massive LBV/WR system HD 5980 in the Small Magellanic Cloud has undergone a long-term S Doradus type variability cycle and two brief and violent eruptio…
The Galactic O-Star Spectroscopic (GOSSS) and Northern Massive Dim Stars (NoMaDS) Surveys, the Galactic O-Star Catalog (GOSC), and Marxist Ghost Buster (MGB)
J. Maíz Apellániz, A. Pellerin, R. H. Barbá +6
There are several ongoing massive-star (mostly of spectral type O) surveys that are significantly increasing the quality and quantity of the spectroscopic information about these o…
Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
Nolan R. Walborn, Jesus Maiz Apellaniz, Alfredo Sota +5
With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we…
Circumstellar Material in Type Ia Supernovae via Sodium Absorption Features
Assaf Sternberg, Avishay Gal-Yam, Josh D. Simon +17
Type Ia supernovae are key tools for measuring distances on a cosmic scale. They are generally thought to be the thermonuclear explosion of an accreting white dwarf in a close bina…
The Carnegie Supernova Project: Second Photometry Data Release of Low-Redshift Type Ia Supernovae
Maximilian Stritzinger, M. M. Phillips, Luis Boldt S. +20
The Carnegie Supernova Project (CSP) was a five-year observational survey conducted at Las Campanas Observatory that obtained, among other things, high-quality light curves of ~100…
Two O2 If*/WN6 stars possibly ejected from the massive young Galactic cluster Westerlund 2
A. Roman-Lopes, R. H. Barba, N. I. Morrell
In this paper we report the identification of two new Galactic O2 If*/WN6 stars (WR20aa and WR20c), in the outskirt of the massive young stellar cluster Westerlund 2. The morpholog…
He II 4686 in eta Carinae: collapse of the wind-wind collision region during periastron passage
M. Teodoro, A. Damineli, J. I. Arias +23
The periodic spectroscopic events in eta Carinae are now well established and occur near the periastron passage of two massive stars in a very eccentric orbit. Several mechanisms h…
An accurate position for the black hole candidate XTE J1752-223: re-interpretation of the VLBI data
J. C. A. Miller-Jones, P. G. Jonker, E. M. Ratti +4
Using high-precision astrometric optical observations from the Walter Baade Magellan Telescope in conjunction with high-resolution very long baseline interferometric (VLBI) radio i…
High resolution spectroscopy of the BCD galaxy Haro 15:I. Internal kinematics
Verónica Firpo, Guillermo Bosch, Guillermo F. Hägele +2
Using echelle spectroscopy, obtained at Las Campanas Observatory, we present a detailed study of the internal kinematics of the nebular material in multiple knots of the blue compa…
Science with the Galactic O-Star Spectroscopic Survey (GOSSS) : The relationship between DIBs, ISM, and extinction
Miguel Penadés Ordaz, Jesús Maíz Apellániz, Alfredo Sota Ballano +6
In this poster we show our preliminary analysis of DIBs (Diffuse Interstellar Bands) and other interstellar absorption lines with the purpose of understanding their origin and thei…
The Galactic O-Star Spectral Survey (GOSSS) Project status and first results
Alfredo Sota, Jesús Maíz Apellániz, Rodolfo H. Barbá +6
The Galactic O-Star Spectroscopic Survey (GOSSS) is a project that is observing all known Galactic O stars with B < 13 (~2000 objects) in the blue-violet part of the spectrum with…