Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line

Details Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line

2011-02-16

arxiv.org/abs/1102.3210v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 6 figures, Pub. Astron. Soc. Japan, Vol. 63 (2011), in press

Scientific paper

Based on the near-IR spectra of 33 late-type stars in the wide metallicity range (mainly dwarfs and partly giants) obtained with IRCS+AO188 of the Subaru Telescope, we confirmed that He I 10830A line is seen in absorption in almost all moderately to extremely metal-poor stars of thick disk and halo population (from [Fe/H]~ -0.5 down to [Fe/H]~ -3.7), the strength of which is almost constant irrespective of the metallicity. This is an evidence that chromospheric activity at a basal level persists even for such old stars, despite that their rotations are considered to be slowed down and incapable of sustaining a dynamo, suggesting that some kind of chromospheric heating mechanism independent of rotation/magnetism (e.g., acoustic heating) may take place.

Affiliated with

Also associated with

No associations

Rating

Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line 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 Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromospheres in Metal-Poor Stars Evidenced from the He I 10830A Line will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-416583