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X-ray spectroscopy of late-type stars. [heao 2 observations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Swank, J. H. White, N. E. |
| Copyright Year | 1980 |
| Description | The solid state spectrometer on the Einstein Observatory determined .4 - 4.5 keV spectra for Capella, Algol and 6 RS CVn binaries. All show evidence for a bimodal distribution of emission measure with temperature with one component approximately 7 million degrees and one approximately 40 million degrees. The spread in values of both luminosity and emission measure is 10 for the low temperature component and approximately 500 for the high temperature component. Line emission due to Fe can be identified in most of them and abundances of Si, S and Fe are consistent with approximately solar values in all cases. Estimates indicate dimensions of the emitting regions are on the order of the stellar size and the binary separation for the low and high temperature components, respectively, unless the pressures are high. Variations in the flux were observed, mostly in the hard component for the RS CVn binaries, in the soft component for Capella. A flare was observed during primary eclipse of Algol. The possibility is discussed that the other variations could all be due to intrinsic variability with a time scale of hours-days rather than eclipse or modulation with photometric phase. |
| File Size | 9946118 |
| Page Count | 23 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800013661 |
| Archival Resource Key | ark:/13960/t3dz52d5h |
| Language | English |
| Publisher Date | 1980-03-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Stellar Spectra Heao 2 Binary Stars X Ray Spectroscopy Late Stars Spectral Emission Abundance Solid State Devices Line Spectra X Ray Astronomy Stellar Coronas Stellar Luminosity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
