A Proper-Motion Corrected, Cross-Matched Catalog Of M Dwarfs In SDSS And FIRST

Details A Proper-Motion Corrected, Cross-Matched Catalog Of M Dwarfs In SDSS And FIRST A Proper-Motion Corrected, Cross-Matched Catalog Of M Dwarfs In SDSS And FIRST

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832606a&link_type=abstract

American Astronomical Society, AAS Meeting #218, #326.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We present a preliminary analysis of M dwarfs identified in both the Sloan Digital Sky Survey (SDSS) and the Very Large Array's (VLA) Faint Images of the Radio Sky at Twenty-centimeters survey (FIRST). The presence of magnetic fields is often associated with indirect magnetic activity measurements, such as H-alpha or X-ray emission. Radio emission, in contrast, is directly proportional to the magnetic field strength in addition to being another measure of activity. We search for stellar radio emission by cross-matching the SDSS DR7 M dwarf sample with the FIRST catalog. The SDSS data allow us to examine the spectra of our objects and correlate the magnetic activity (H-alpha) with the magnetic field strength (radio emission). Accurate positions and proper motions are important for obtaining a complete list of overlapping targets. Positions in FIRST and SDSS need to be proper motion corrected in order to ensure unique target matches since nearby M dwarfs can have significant proper motions (up to 1'' per year). Some previous studies have neglected the significance of proper motions in identifying overlapping targets between SDSS and FIRST; we correct for some of these previous oversights. In addition the FIRST data were taken in multiple epochs; individual images need to be proper motion corrected before the images can be co-added. Our cross-match catalog puts important constraints on models of magnetic field generation in low-mass stars in addition to the true habitability of attending planets.

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