The Nature of the Hot Components in the S-Type Symbiotic Stars V840 Cen and V443 Her

Details The Nature of the Hot Components in the S-Type Symbiotic Stars V840 Cen and V443 Her The Nature of the Hot Components in the S-Type Symbiotic Stars V840 Cen and V443 Her

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541609v&link_type=abstract

American Astronomical Society, AAS Meeting #215, #416.09; Bulletin of the American Astronomical Society, Vol. 42, p.267

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a synthetic spectral analysis of two poorly studied S-Type symbiotic stars, V840 Cen (Liller's Nova-like object) and V443 Her using model accretion disks and model high gravity photospheres. V840 Cen has an unusually good quality IUE echelle high dispersion SWP spectrum that was obtained when the system was in outburst. The spectrum resembles a mid B-star and was at V 7 when in outburst but has since faded to its pre-outburst level of V 13.5 to 14.4 (Mikolajewska 2009). The IUE echelle observation reveals a rich absorption line spectrum with prominent P Cygni profiles in the doublet resonance lines of C IV (1548, 1151), Si IV (1393, 1402) and emission at N V (1238, 1242) indicating wind outflow. However, our preliminary results indicate that neither high gravity photospheres nor optically thick accretion disks provide acceptable fits to the FUV data. This puzzling object, caught in outburst, merits further study.
V443 Her has never had a recorded outburst. Its multi-wavelength data was analyzed most recently by Skopal (2005) who dismissed an accretion disk but fit the FUV data with a hot black body SED at Teff=105K. Our preliminary fitting yields a reasonable best-fit with Mwd=0.6 Msun, an orbital inclination of 18 degrees with an accretion rate of 10-8 Msun/yr, implying a distance of 1 kpc. Lower accretion rates and higher inclination improve the spectral fits but the distance to V443 Her becomes even closer. The best-fit accretion disk to the FUV data has i=81 degrees and an accretion rate of 10-9 Msun/yr, but the distance also becomes unacceptably close. High gravity photosphere models have Teff 30,000K which is close to Skopal's black body temperature for the hot component but the implied distance is too close.
This work is supported by NSF grant AST0807892 to Villanova University.

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