Using the HST Goddard High Resolution Spectrograph (GHRS), we have obtained high S/N echelle observations of the weak interstellar N I 1160,1161 absorption doublet toward the stars Cas, Ori, Ori, Ori, Sco and Sco. In combination with a previous GHRS measurement of N I toward Oph, these new observations yield a mean interstellar gas-phase nitrogen abundance (per 10 H atoms) of 10 N/H = 75 4 ( 1 ...

We present an analysis of the properties of the hot interstellar medium (ISM) in the merging pair of galaxies known as The Antennae (NGC 4038/39), performed using the deep, coadded ∼411 ks Chandra ACIS-S data set. These deep X-ray observations and Chandra’s high angular resolution allow us to investigate the properties of the hot ISM with unprecedented spatial and spectral resolution. Through a...

We study the effects of neutron captures in AGB stars on “Fe-group” elements, with an emphasis on Cr, Fe, and Ni. These elements show anomalies in Cr, Fe, and Ni in solar-system materials, which are commonly attributed to SNe. However, as large fractions of the interstellar medium (ISM) were reprocessed in AGB stars, these elements were reprocessed, too. We calculate the effects of such reproce...

Spicules are plasma jets that observed in the dynamic interface region between visible solar surface and hot corona. At any given time, it is estimated about 3 million spicules present on Sun. We find an intriguing parallel simulated spicular forest a solar-like atmosphere numerous of polymeric fluids when both subjected to harmonic forcing. In radiative magnetohydrodynamic numerical simulation...

Radiative transfer equilibrium models of nearby interstellar matter (ISM) are required to determine the boundary conditions of the heliosphere from astronomical observations of nearby stars. These models are also constrained by data on the ISM inside of the solar system, including pickup ion, anomalous cosmic rays, and in situ He data. The two best ISM models give semi-empirical filtration fact...