The Nature of the Hot Components of the Yellow Symbiotic Stars LT Del and StHa190

Details The Nature of the Hot Components of the Yellow Symbiotic Stars LT Del and StHa190 The Nature of the Hot Components of the Yellow Symbiotic Stars LT Del and StHa190

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541922d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #419.22; Bulletin of the American Astronomical Society, Vol. 42, p.280

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a synthetic spectral analysis of the far ultraviolet archival IUE spectra of two yellow symbiotic stars, LT Del and StHa190 during their quiescence in order to shed light on the nature of their hot components. LT Del exhibits peculiar abundances patterns and strong and variable nebular emission while StHa190 has peculiar abundances and rapidly variable bi-polar outflow yet previous work on both systems (Skopal 2005; Munari et al.2001) reveal no evidence of an accretion disk and negligible nebular contributions to their FUV continuum fluxes.
For LT Del we assumed two values of reddening, E(B-V) = 0.20 (Skopal 2005) and E(B-V) = 0.35 (Munari & Buson 1992) while for STHa190, we adopted E(B-V) = 0.10. We treated the white dwarf mass and orbital inclination as free parameters in the model fitting of white dwarf photospheres and optically thick accretion disks. For LT Del, with E(B-V) = 0.20, an optically thick accretion disk with Mwd = 0.6 M&sun;, a disk inclination angle of 18 degrees and = 10-8 M&sun;/yr provides the best fit and yields a distance of 1 kpc. For StHa190, we find a combination (WD+DISK) fit with a 39,000K, log g=8, white dwarf, and an accretion disk with an inclination = 60 degrees, and an accretion rate = 1 x 10-9 M&sun;/yr yields the best fit, giving a distance of only 110 pc. Our work supports the presence of optically thick accretion disks in both of these yellow symbiotic systems, contrary to earlier findings.
This work is supported by NSF grant 0807892 to Villanova University.

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