Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915324c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #153.24
Other
Scientific paper
We describe a search for close spectroscopic dwarf M star binaries using data from the Sloan Digital Sky Survey (SDSS) to address the question of the rate of occurrence of multiplicity in M dwarfs. We use a template fitting technique to measure radial velocities from 145,888 individual spectra obtained for a magnitude-limited sample of 39,543 M dwarfs. Typically, the three or four spectra observed for each star are separated in time by less than four hours, but for 17% of the stars, the individual observations span more than two days. In these cases we are sensitive to large amplitude radial velocity variations on time scales comparable to the separation between the observations. We use a control sample of objects having observations taken within a four hour period to make an empirical estimate of the underlying radial velocity error distribution and simulate our detection efficiency for a wide range of binary star systems. We find the frequency of binaries among the dwarf M stars with a<0.4 AU to be 3-4% depending on the assumed distribution for the semimajor axis. Comparison with other samples of binary stars demonstrates that the close binary fraction, like the total binary fraction, is a increasing function of primary mass.
Blake Cullen H.
Clark Benjamin
Knapp Gillan R.
No associations
LandOfFree
The Close Binary Fraction of Dwarf M 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 The Close Binary Fraction of Dwarf M Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Close Binary Fraction of Dwarf M Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1576783