Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..992r&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August
Astronomy and Astrophysics
Astrophysics
White Dwarf/ M Dwarf Pairs, Binaries
Scientific paper
Using spectra and color cuts in the Sloan filter system, we have identified 83 White Dwarf - M dwarf pairs in the Sloan Digital Sky Survey (SDSS). The blue portion of the spectrum is fit with white dwarf models as a function of temperature. The best fit is then subtracted off to extract the M-dwarf spectrum. Many of these objects show strong Hα emission, an indicator of M-dwarf chromospheric activity. We have extracted a list of white dwarf temperatures, M-dwarf spectral types, and Hα equivalent widths, and we compare the activity level of these irradiated systems with the field M star population. If a portion of this activity is due to irradiation from the white dwarf companion, then we are studying binaries at a wide range in separations, from loosely bound systems to close binary pre-CVs. This hypothesis is being tested with a spectroscopic follow-up of SDSS objects by looking for (orbital) periodicity in the systems with the highest activity levels, using the ARC 3.5m telescope at Apache Point Observatory (APO).
Hawley Suzanne L.
Raymond Sean N.
Szkody Paula
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