Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915346h&link_type=abstract
American Astronomical Society, AAS Meeting #219, #153.46
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on time-series high-resolution infrared spectra for five of the six known D-type symbiotic novae. D-type symbiotics are binary systems with a Mira and white dwarf. The spectra map the pulsation kinematics of the Mira and provide the center-of-mass velocity for the Mira. The Mira velocity amplitudes indicate that in the D-type symbiotic novae studied the Miras have masses 4 solar masses. This is confirmed in one system where the Mira has lithium from hot bottom burning. The white dwarf companions must have evolved from yet more massive progenitors and must be massive. No orbital motion is detected in agreement with previous orbital estimates of periods >100 yrs and semimajor axes 50 AU. Except during dust forming events Miras in these systems have unobscured spectra short of 1.6 μm even when the mass and period require superwind mass loss. Our results are in agreement with the white dwarf inhibiting dust formation. Longward of 2 μm the spectrum is formed entirely in a warm circumstellar envelope. The long wavelength continuum is possibly formed in the Mira -- white dwarf interacting wind region.
Fekel Francis C.
Hinkle Kenneth H.
Joyce Richard R.
Wood Peter
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