The activity of late-type stars: the Sun among stars with cyclic activity

Details The activity of late-type stars: the Sun among stars with cyclic activity The activity of late-type stars: the Sun among stars with cyclic activity

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..579k&link_type=abstract

Astronomy Reports, vol. 50, Issue 7, p.579-587

Astronomy and Astrophysics

Astronomy

3

Pacs Numbers 97.10.J - 97.20.J

Scientific paper

The coronal and chromospheric emission of several hundred late-type stars whose activity was recently detected are analyzed. This confirms the previous conclusion for stars of HK project that there exist three groups of objects: active red M dwarfs, G-K stars with cyclic activity, and stars exhibiting high but irregular activity. The X-ray fluxes, EUV-spectra, and X-ray cycles can be used to study the main property of stellar coronas—the gradual increase in the number of high-temperature (T ≥ 10 MK) regions in the transition from the Sun to cyclically active K dwarfs and more rapidly rotating F and G stars with irregular activity. The level of X-ray emission is closely related to the spottedness of the stellar surface. The correlation between the chromospheric and coronal emission is weak when the cycles are well-defined, but becomes strong when the activity is less regular. Unexpectedly, stars whose chromospheric activity is even lower than that of the Sun are fairly numerous. Common and particular features of solar activity among the activity of other cyclically active stars are discussed. Our analysis suggests a new view of the problem of heating stellar coronas: the coronas of stars with pronounced cycles are probably heated by quasistationary processes in loops, while prolonged nonstationary coronal events are responsible for heating the coronas of F and G stars with high but irregular activity.

Affiliated with

Also associated with

No associations

Rating

The activity of late-type stars: the Sun among stars with cyclic activity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The activity of late-type stars: the Sun among stars with cyclic activity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The activity of late-type stars: the Sun among stars with cyclic activity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1137700