Results 311 to 320 of about 307,688 (344)
Some of the next articles are maybe not open access.
Infrared Velocities of Carbon Stars
Astrophysics and Space Science, 1994We have measured radial velocities of infrared photospheric lines observed in 37 bright carbon stars. The spectra were obtained on the Kitt Peak National Observatory 4 meter telescope with Fourier transform spectrometers between 1976 and 1988. The observations have a typical resolution of 65000 and a typical signal-to-noise ratio of 50. All the spectra
C. Barnbaum, K. Hinkle
openaire +1 more source
Carbon stars in infrared surveys
Astrophysics and Space Science, 1994In order to prepare the analysis of the forthcoming near-IR surveys (DENIS, 2MASS) and to interpret them in terms of galactic structure and AGB evolution, we present model predictions of AGB distributions in K, in 12µm and in (J-K, [12–25]) space, as they will be obtained from these surveys, cross-correlated with IRAS Catalog. The simulations have been
F. Guglielmo, A. C. Robin
openaire +1 more source
On the Carbon-Star Status of Five Stars in a New Carbon Star Catalog
Chinese Journal of Astronomy and Astrophysics, 2002We find that five sources listed in the new carbon star catalog are not really carbon-rich objects but oxygen-rich stars, because they all have the prominent 10mum silicate features in absorption and the 1612 MHz OH maser emission or/and the SiO molecular features.
Pei-Sheng Chen, Yi-Fei Gao
openaire +1 more source
2021
Father Angelo Secchi was a Jesuit priest and a premier nineteenth-century astronomer. Among his many accomplishments was the discovery of carbon stars (Fig. 18.1).
openaire +1 more source
Father Angelo Secchi was a Jesuit priest and a premier nineteenth-century astronomer. Among his many accomplishments was the discovery of carbon stars (Fig. 18.1).
openaire +1 more source
Carbon Dioxide in Star-forming Regions
The Astrophysical Journal, 2000We consider the gas-phase chemistry of CO2 molecules in active regions. We show that CO2 molecules evaporated from dust in hot cores cannot be efficiently destroyed and are in fact copiously produced in cooler gas. When CO2-rich ices are sputtered in strong MHD shock waves, the increase in atomic hydrogen, due to H2 dissociation by ion-neutral ...
, Charnley, , Kaufman
openaire +2 more sources
Carbon Star Effective Temperatures
1981A new stellar angular diameter measurement is consistent with a proposed relation between effective and color temperature. Verification by model atmosphere studies is urgently required.
S. T. Ridgway +3 more
openaire +1 more source
Condensation chemistry of carbon stars
Astrophysical implications of the laboratory study of presolar materials, 1997A historical overview about the development of thermodynamic calculations and their application to stellar atmospheres is given. Thermochemical equilibrium chemistry for major and trace elements in carbon star atmospheres is discussed. The calculations indicate TiC, graphite and SiC dust formation within 1–3 stellar radii from the photosphere.
Katharina Lodders, Bruce Fegley
openaire +1 more source
IRAS LRS Spectra of Cool Carbon Stars: Clues of Carbon Star Evolution
1987We report on a study of infrared properties of optically identified carbon stars. The aim is to get a coherent observationally based picture of the carbon star evolution along the asymptotic giant branch (AGB) in the Hertzsprung-Russell diagram.
openaire +1 more source
IRAS Observations of Carbon Stars
1986In view of the light shed by IRAS on dark matter one wonders what the IRAS data add to our knowledge of carbon-rich dust. As the main factory of this dust carbon stars deserve a thorough study. In this paper we report on observations of cool carbon stars between 7 and 120 µm obtained by IRAS. Cool carbon stars populate the asymptotic giant branch (AGB)
openaire +1 more source
Spectrophotometry of carbon stars
Astrophysics, 1998S. E. Nersessian, M. Sh. Karapetian
openaire +1 more source