Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars

Details Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486..994r&link_type=abstract

Astrophysical Journal v.486, p.994

Astronomy and Astrophysics

Astronomy

8

Stars: Activity, Stars: Chromospheres, Stars: Late-Type, Ultraviolet: Stars

Scientific paper

Chromospheric activity in late A- and early F-type field stars of luminosity classes III through V has been investigated using the helium D3 absorption feature. This feature shows a detection boundary near b - y = 0.19 (B - V = 0.29). This color index corresponds to a dividing line in activity levels as determined from the C II lambda 1335 chromospheric emission line. On the red side of this boundary, stars exhibit strong or moderately strong C II emission and strong or moderately strong D3 absorption. However, on the blue side, D3 absorption does not conclusively appear, while several stars show moderately strong C II emission. The data suggest that D3 is sensitive to the boundary at B - V = 0.29, but they also suggest limitations in the use of D3 as an activity indicator in the late A-type stars. To within observational errors, the D3 boundary appears at the same color index for the full range of luminosity classes explored, in contradiction with some acoustic energy calculations. In addition, the strength of D3 absorption shows no significant trend with luminosity class or the Stromgren delta c1 index, with a wide range of activity levels at a given luminosity or surface gravity.

Affiliated with

Also associated with

No associations

Rating

Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars 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 Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chromospheric Activity in Dwarf and Evolved Late A- and Early F-Type Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1224563