Results 141 to 150 of about 1,868 (166)

Radial velocities of M dwarf stars

Publications of the Astronomical Society of the Pacific, 1987
Radial velocities for 72 M dwarfs have been obtained having internal errors of about 0.1 km/s and external errors of about 0.4 km/s. Multiple velocity measurements of ten dMe stars have yielded a set of six which have no stellar companions, providing confirmation that the dMe phenomenon can occur in single stars.
Geoffrey W. Marcy, Victoria Lindsay, Karen Wilson   +2 more
openaire   +1 more source

Photometry of Dwarf K and M Stars

Publications of the Astronomical Society of the Pacific, 1988
Broad-band UBVRI photometry is presented for 50 dwarf K and M stars, most without previou photometry, from the lists of Vyssotsky.
John Booth, Joseph Caruso, E. W. Weis
openaire   +1 more source

The Internal Structure of M Dwarf Stars

Publications of the Astronomical Society of Japan, 1960
Abstract Models for M dwarfs which consist of a convective envelope and a radiative core are computed with the effects of electron degeneracy taken into account. The results show that in the middle M dwarf, such as Krüger 60A, O2 Eri C and Krüger 60B, the convective envelope extends inward attaining to more than 40% of the stellar radius
openaire   +1 more source

Coronal Structure in M Dwarf Stars

1996
In view of the importance of these objects as observational probes for theories of stellar dynamos and coronal heating, as well as their potentially important role in the galactic environment, we implemented a program of pointed ROSAT PSPC observations of selected M dwarfs in the solar neighborhood.
M. S. Giampapa, R. Rosner, V. Kashyap, T. A. Fleming, J. H. M. M. Schmitt, J. A. Bookbinder   +5 more
openaire   +1 more source

Abundance Survey of M and K Dwarf Stars

Nuclear Physics A, 2005
We report the measurement of chemical abundances in 35 low-mass main sequence (M and K dwarf) stars. We have measured the abundance of 12 elements in Kapteyn's Star, a nearby halo M subdwarf. The abundances indicate an iron abundance of [Fe/H] = −0.98, which is about 0.5 dex smaller than that measured in the only previous published measurement using ...
Vincent M. Woolf, George Wallerstein
openaire   +1 more source

Near‐Ultraviolet Spectra of Nine M Dwarf Stars, or a Second Effort to Find Optical Coronal Lines in M Dwarf Stars

Publications of the Astronomical Society of the Pacific, 2004
We have searched for optical coronal lines in the 3100–3700 A region of eight M dwarf stars with rather low levels of activity. This brief survey supplements a similar search in 15 active stars published in 1991. No coronal lines could be identified. However, the emission spectra including lines of H i, He i, Ca ii, Ca i, Si i, and Fe i are described ...
George Wallerstein, Sudhi Tyagi
openaire   +1 more source

Highly r-process enhanced stars in ultra-faint dwarf galaxies

Monthly Notices of the Royal Astronomical Society, 2021
Myoungwon Jeon, Volker Bromm, Gurtina Besla   +2 more
exaly  

Ultra-faint dwarf galaxies: unveiling the minimum mass of the first stars

Monthly Notices of the Royal Astronomical Society, 2021
Stefania Salvadori, Asa Skúladóttir, Salvadori Stefania   +2 more
exaly  

A LIST OF DWARF M-TYPE STARS

Publications of the Astronomical Society of the Pacific, 1922
W. S. Adams, A. H. Joy
openaire   +1 more source

A DECam view of the diffuse dwarf galaxy Crater II – Variable stars

Monthly Notices of the Royal Astronomical Society, 2020
Matteo Monelli, Peter B Stetson, Carme Gallart   +2 more
exaly