Discovery of Cool Companions to Nearby Stars

Details Discovery of Cool Companions to Nearby Stars Discovery of Cool Companions to Nearby Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110301d&link_type=abstract

American Astronomical Society, AAS Meeting #211, #103.01; Bulletin of the American Astronomical Society, Vol. 39, p.919

Astronomy and Astrophysics

Astronomy

Scientific paper

We performed a search for cool companions (M7 and later) sharing proper motion with known high-proper motion stars using multi-epoch data from the 2MASS, SDSS and SIMP surveys. We have identified 29 candidate companions, nearly doubling the number of known such objects.The estimated spectral types of the companions found in this study range from M7-L4 and their estimated physical separations are in the range of 300-20 000 AU. Many of these systems fall in a sparsely populated region of the mass/separation diagram of known binaries and their very weak bounding energy is a challenge to current low-mass star formation models. Furthermore, as companions have the same age, metallicity and distance as their parent star, they can serve as evolutionary model benchmark objects. The companion candidates are currently the subject of spectroscopic follow-up with GMOS and Gemini.

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