03313 + 6058 : an AGB star with 30 micron emission ⋆
نویسنده
چکیده
This paper reports a detection of the 30 micron emission feature from the C–rich Asymptotic Giant Branch (AGB) star IRAS 03313+6058 based on the ISO– SWS observation. Modeling of the spectral energy distribution shows that this emission starts at about 20 micron and possibly extends to the limit (45 micron) of the observation. By assuming MgS as the carrier, the number ratio of Sulfur atom in MgS to Hydrogen atom in total, n(S)/n(H), is 3.0×10 from model fitting. A comparison of this emission feature is made with other AGB and post–AGB objects.
منابع مشابه
IRAS 03313+6058: an AGB star with 30 micron emission
This paper reports a detection of the 30 micron emission feature from the C–rich Asymptotic Giant Branch (AGB) star IRAS 03313+6058 based on the ISO–SWS observation. Modeling of the spectral energy distribution shows that this emission starts at about 20 micron and possibly extends to the limit (45 micron) of the observation. By assuming MgS as the carrier, the number ratio of Sulfur atoms in M...
متن کاملAtomic and Molecular Emission Lines from the Red Rectangle
HD 44179 is the binary, post–asymptotic giant branch, central star of the Red Rectangle Nebula. Echelle spectra of the star have been obtained over a wavelength range from about 3800 to 10000 8 at a resolving power R 1⁄4 38; 000. A maximum S/N of 850 was achieved near 6800 8. Fifty-seven identified atomic or ionic emission lines of 12 elements are detected in the star’s spectrum, along with 76 ...
متن کاملThree - micron spectra of AGB stars and supergiants in nearby galaxies ⋆
The dependence of stellar molecular bands on the metallicity is studied using infrared L-band spectra of AGB stars (both carbon-rich and oxygen-rich) and M-type supergiants in the Large and Small Magellanic Clouds (LMC and SMC) and in the Sagittarius Dwarf Spheroidal Galaxy. The spectra cover SiO bands for oxygen-rich stars, and acetylene (C 2 H 2), CH and HCN bands for carbon-rich AGB stars. T...
متن کاملThe remarkable asymmetric outflow from the Cygnus Egg Nebula
We present ground based continuum images in the infrared, from 1.2 to 19μm, and an H2 2.122μm line emission image of the post-AGB star AFGL2688, the Cygnus Egg Nebula. We show that the standard model of this source, comprising a fast wind focussed by a dense, equatorial, dusty torus into a bipolar flow at position angle 15◦ and close to the plane of the sky, cannot explain the combination of ki...
متن کاملEffects of Metallicity on the Chemical Composition of Carbon Stars
We present Spitzer IRS data on 19 asymptotic giant branch (AGB) stars in the Large Magellanic Cloud, complementing existing published data sets of carbon stars in both Magellanic Clouds and the Milky Way, to investigate the effects of metallicity on dust and molecular spectral features arising from the circumstellar envelope. We find that the C2H2 P and R branches at 7.5 micron are affected by ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998