期刊
ASTROPHYSICAL JOURNAL
卷 738, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/738/2/164
关键词
open clusters and associations: individual (alpha Per, IC 2391, IC 2602); stars: activity; stars: chromospheres; stars: late-type; stars: rotation
资金
- UK Science and Technologies Facilities Council (STFC)
- CSUN College of Science
- STFC [ST/G001987/1, ST/G004986/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G004986/1, ST/G001987/1] Funding Source: researchfish
We investigate if the super-saturation phenomenon observed at X-ray wavelengths for the corona exists in the chromosphere for rapidly rotating late-type stars. Moderate resolution optical spectra of fast-rotating EUV- and X-ray-selected late-type stars were obtained. Stars in a Per were observed in the northern hemisphere with the Isaac Newton 2.5 m telescope and Intermediate Dispersion Spectrograph. Selected objects from IC 2391 and IC 2602 were observed in the southern hemisphere with the Blanco 4 m telescope and R-C spectrograph at CTIO. Ca II H and K fluxes were measured for all stars in our sample. We find the saturation level for Ca II Kat log(L-CaK/L-bol) = -4.08. The Ca II K flux does not show a decrease as a function of increased rotational velocity or smaller Rossby number as observed in the X-ray. This lack of super-saturation supports the idea of coronal stripping as the cause of saturation and super-saturation in stellar chromospheres and coronae, but the detailed underlying mechanism is still under investigation.
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