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25 papers · 1 filter
Teff and logg dependence of FeH in M-dwarfs
S. Wende, A. Reiners, H. G. Ludwig
We present synthetic FeH band spectra in the z-filter range for several M-dwarf models with logg=3.0-5.0 [cgs] and Teff=2800K -3450K. Our aim is to characterize convective velociti…
Activity and rotation of low mass stars in young open clusters
Andreas Seifahrt, Ansgar Reiners, Aleks Scholz +1
We present first results from a multi-object spectroscopy campaign in IC2602, the Hyades, the Pleiades, and the Coma cluster using VLT/FLAMES. We analysed the data for radial veloc…
Evidence for Magnetic Flux Saturation in Rapidly Rotating M Stars
A. Reiners, G. Basri, M. Browning
We present magnetic flux measurements in seven rapidly rotating M dwarfs. Our sample stars have X-ray and H-alpha emission indicative of saturated emission, i.e., emission at a hig…
The moderate magnetic field on the flare star Proxima Centauri
Ansgar Reiners, Gibor Basri
We report moderate magnetic flux of 450G < Bf < 750G (3sigma) on the nearby M5.5 flare star Proxima Centauri. A high resolution UVES spectrum was used to measure magnetic flux from…
Multiwavelength observations of a giant flare on CN Leonis I. The chromosphere as seen in the optical spectra
B. Fuhrmeister, C. Liefke, J. H. M. M. Schmitt +1
Flares on dM stars contain plasmas at very different temperatures and thus affect a wide wavelength range in the electromagnetic spectrum. While the coronal properties of flares ar…
Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
Ansgar Reiners, Gibor Basri
We present results from a high-resolution spectroscopic survey of 45 L dwarfs, which includes both very low-mass stars and brown dwarfs. Our spectra allow us to derive a significan…