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Theta(1) and gamma tauri: understanding the coronal structure of hyades giants. euv spectroscopy of by dra systems
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stern, Robert A. |
| Copyright Year | 1995 |
| Description | These programs involve: (1) analysis and interpretation of EUVE spectrometer observations of the active giant beta Cet in comparison to the Hyades giant theta(1) Tau, and (2) analysis and interpretation of EUVE spectrometer observations of the BY Dra systems FK Aqr, DH Leo, and BH Lyn. EUVE carried out observations of beta Cet, but has yet to perform an observation of theta(1) Tau. In beta Cet, a number of Fe lines from high ionization species were observed, up to Fe XXIV. The spectrum overall resembles that seen in the active binary Capella (alpha Aur). All three BY Dra systems were observed by EUVE, and show evidence of high temperature (approximately 10(exp 7) K) plasma; FK Aqr and DH Leo show significant variability in their Deep Survey lightcurves. In FK Aqr, spectral differences between its 'quiescent' and 'active' states suggest possible differences in the plasma density. In DH Leo, the Deep Survey lightcurve, taken over nearly 8 days, shows a distinct period of approximately 1.05 days, similar to the photometric period. The emission measure distributions of all three systems are rather similar in shape, and can be well-represented by a power law with slope approximately 1.5 from 6.2-7.0 in log T. |
| File Size | 4742184 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960014055 |
| Archival Resource Key | ark:/13960/t05x7809z |
| Language | English |
| Publisher Date | 1995-09-07 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Imaging Spectrometers High Temperature Plasmas Extreme Ultraviolet Explorer Satellite Ultraviolet Spectroscopy Ultraviolet Spectra Iron Star Clusters Plasma Density Stellar Coronas Variable Stars Stellar Flares Giant Stars Emission Spectra Ionization Binary Stars Spectrum Analysis Line Spectra Extreme Ultraviolet Radiation Flare Stars Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
