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X-Ray Coronae from Stars

Published online by Cambridge University Press:  25 May 2016

R. Pallavicini
R. Pallavicini*
Affiliation:
Osservatorio Astronomico di Palermo Palazzo dei Normanni, 90134 Palermo, Italy

Extract

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A number of major advances in stellar coronal physics have occurred since 1990 mainly as a consequence of imaging observations by ROSAT and spectroscopic observations by ASCA. These can be summarised as follows:

  1. 1. an all-sky survey has been performed by ROSAT at a sensitivity of ~ 2 × 10−13 erg cm−2 s−1, complemented by pointed observations an order of magnitude deeper;

  2. 2. complete mapping and deeper pointings have been obtained for virtually all open clusters closer than ~ 500 pc, and covering the age range from ~ 30 Myr to ~ 700 Myr;

  3. 3. complete mapping and deeper paintings have been obtained for several Star Forming Regions (SFRs) covering the age range ~ 1 to ~ 10 Myr;

  4. 4. spectroscopic observations of bright coronal sources have been obtained with EUVE and ASCA allowing the derivation of the temperature structure and elemental abundances.

Type
Session 1: Plasma and Fresh Nucleosynthesis Phenomena
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 13 - 16
Copyright
Copyright © Kluwer 1998 

References

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