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Red Supergiant Stars as Cosmic Abundance Probes: II. NLTE Effects in J-band Silicon Lines
Maria Bergemann, Rolf-Peter Kudritzki, Matthias Wueurl +3
Medium resolution J-band spectroscopy of individual red supergiant stars is a promising tool to investigate the chemical composition of the young stellar population in star forming…
Age Dating Stellar Populations in the Near Infrared: An absolute age indicator from the presence/absence of red supergiants
J. Zachary Gazak, N. Bastian, R. P. Kudritzki +4
The determination of age is a critical component in the study of a population of stellar clusters. In this letter we present a new absolute age indicator for young massive star clu…
The host galaxy of the super-luminous SN 2010gx and limits on explosive nickel-56 production
Ting-Wan Chen, Stephen J. Smartt, Fabio Bresolin +6
Super-luminous supernovae have a tendency to occur in faint host galaxies which are likely to have low mass and low metallicity. While these extremely luminous explosions have been…
LHS 2803B: A very wide mid-T dwarf companion to an old M dwarf identified from Pan-STARRS1
Niall R. Deacon, Michael C. Liu, Eugene A. Magnier +12
We report the discovery of a wide (approximately 400 AU projected separation), common proper motion companion to the nearby M dwarf LHS 2803 (PSO J207.0300-13.7422). This object wa…
An ultraviolet-optical flare from the tidal disruption of a helium-rich stellar core
S. Gezari, R. Chornock, A. Rest +31
The flare of radiation from the tidal disruption and accretion of a star can be used as a marker for supermassive black holes that otherwise lie dormant and undetected in the centr…
Red Supergiant Stars as Cosmic Abundance Probes: NLTE Effects in J-band Iron and Titanium Lines
Maria Bergemann, Rolf-Peter Kudritzki, Bertrand Plez +3
Detailed non-LTE calculations for red supergiant stars are presented to investigate the influence of NLTE on the formation of atomic iron and titanium lines in the J-band. With the…