Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....123.2796c&link_type=abstract
The Astronomical Journal, Volume 123, Issue 5, pp. 2796-2805.
Astronomy and Astrophysics
Astronomy
13
Stars: Late-Type, Ultraviolet Emission
Scientific paper
We present high-resolution optical spectra of EUV-selected late-type stars. We have detected seven new spectroscopic binaries, including a pair of F stars and an RS Canum Venaticorum candidate. Many of the stars in our sample show remarkable Hα emission with equivalent widths up to 8 Å. Several sources show strong He I 5876 Å emission. We use cross-correlation techniques to estimate line-of-sight rotational velocities and find that they range from less than 5 to over 80 km s-1. Several of the stars show a strong Li 6707 Å line, which we use to determine their Li abundances. The EUV-to-bolometric luminosity, a measure of the coronal heating efficiency, is as high as 10-3. The present sample extends the EUV-selected late-type stars to lower Rossby numbers and makes the coronal saturation boundary better pronounced. Our results indicate that there is a drop in the EUV emission from the corona in late M dwarfs possibly because of a change in the nature of the magnetic dynamo in fully convective stars.
Christian Damian Joseph
Mathioudakis Mihalis
No associations
LandOfFree
High-Resolution Optical Observations of Extreme-Ultraviolet-selected Active Late-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 High-Resolution Optical Observations of Extreme-Ultraviolet-selected Active Late-type Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-Resolution Optical Observations of Extreme-Ultraviolet-selected Active Late-type Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1726096