61 Cyg
Alpha Centauri A+B
EQ Peg
HD 5980
HD5980
HR 1099
HR 1099
SV Cam
WR 25
WR 6
Xi1 Canis Majoris
zeta Puppis
Normal StarsThe X-ray emission from low-mass stars was quickly interpreted in terms of coronal activity, similar to that observed in the Sun. Many M-type stars were found to display relatively strong X-ray emission, which correlated with other indicators of activity, such as emission in Hα or the Ca II doublet. It was also found that there was a strong correlation between age and X-ray activity. Although emission from low mass stars can be understood in terms of coronal activity, the existence of relatively soft X-ray emission from massive stars came as something of a surprise. Models trying to explain it invoke hydrodynamic shocks resulting from intrinsic instabilities in the star's radiatively driven winds. [Ref 4] |
| 61 Cyg | Alpha Centauri A+B | EQ Peg | HD 5980 | HD5980 |
| HR 1099 | HR 1099 | SV Cam | WR 25 | WR 6 |
| Xi1 Canis Majoris | zeta Puppis |