Sleuthing the Dynamo. II. Hubble Space Telescope Goddard High Resolution Spectrograph Observations of Solar-Type Dwarfs in Young Galactic Clusters

Details Sleuthing the Dynamo. II. Hubble Space Telescope Goddard High Resolution Spectrograph Observations of Solar-Type Dwarfs in Young Galactic Clusters Sleuthing the Dynamo. II. Hubble Space Telescope Goddard High Resolution Spectrograph Observations of Solar-Type Dwarfs in Young Galactic Clusters

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...525..240a&link_type=abstract

The Astrophysical Journal, Volume 525, Issue 1, pp. 240-246.

Astronomy and Astrophysics

Astronomy

16

Open Clusters And Associations: Individual (Α Persei, Pleiades), Stars: Coronae, Stars: Rotation, Ultraviolet: Stars

Scientific paper

Far-ultraviolet (1150-1670 Å) spectra of three solar-type dwarfs in the young galactic clusters α Persei and the Pleiades were obtained with the Hubble Space Telescope Goddard High-Resolution Spectrograph (G140L mode). Time series of Si IV λ1393 show erratic variability on timescales of tens of minutes. An X-ray/C IV flux-flux diagram displays a power-law slope of ~2, up to the level of the most active cluster stars. These fall systematically below the extrapolation owing to X-ray ``saturation.'' In rotation-activity diagrams, the X-rays plateau above ~15 km s-1 (P~3 days), while C IV continues to rise until ~35-50 km s-1 (P~1-1.5 days). Such behavior is significant for understanding the magnetic ``dynamo'' at high rotational velocities and is relevant for predicting the ionizing environment bathing newly formed planets around low-mass main-sequence stars.

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