Spectrophotometry of M and C Stars

Nicmos Spectrophotometry and Models for A–stars

Absolute flux distributions for eight stars are well measured from 0.8–2.5 μm with NICMOS grism spectrophotometry at a resolution of R ∼ 100 and an accuracy of 1–2%. These SEDs are fit with Castelli & Kurucz model atmospheres; and the results are compared with the Cohen-Walker-Witteborn (CWW) template models for the same stars. In some cases, the Teff , log g, and log z parameters of the best f...

Infrared spectrophotometry of M 17 with ISOCAM

We report spectrophotometric observations of the H ii region/neutral medium interface in M 17 obtained with the ISOCAM Circular Variable Filter (CVF) in the spectral range 5.15 to 16.5 m. The lines of singly–ionized species come mainly from the clumpy "neutral" interface, while the H ii region dominates the line emission by higher–ionization species. The emission in the Unidentified Infrared Ba...

M–type Vega–like Stars

We carried out a search for M–type Vega–like stars by correlating the IRAS Faint Source Catalog with Hipparcos selected M–type stars. Three stars with apparent IRAS 25 μm excess emission are shown instead to be non–IR–excess stars from ground–based 11.7 and 17.9 μm photometry. Two stars previously suggested to have Vega–like mid–IR excess are also shown to be non–excess stars. These results imp...

Spin and Isospin Asymmetry, Equation of State and Neutron Stars

In the present work, we have obtained the equation of state for neutron star matter considering the in uence of the ferromagnetic and antiferromagnetic spin state. We have also investigated the structure of neutron stars. According to our results, the spin asymmetry stiens the equation of state and leads to high mass for the neutron star.

State Dependent M/M/C/K/N Machining System with Mixed Spares and Removable Repairmen