Supersoft Sources in the LMC

Details Supersoft Sources in the LMC Supersoft Sources in the LMC

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6643b&link_type=abstract

HST Proposal ID #6643

Other

Hst Proposal Id #6643 Binaries And Star Fo

Scientific paper

'Supersoft sources' (SSS) have been discovered during theROSAT mission as a new class of objects characterized by theirhigh luminosity and extremely soft X-ray spectra. A few SSShave been identified as binary systems with a compact primaryaccreting at high mass-transfer rates. The nature of theprimary and the evolutionary status of SSS are still debated.Currently, the most promising model suggests nuclear burningon a white dwarf primary accreting near the Eddington rate.However, models including a black hole or neutron star cannotyet be ruled out. We propose to obtain high-quality UV spectrawith the GHRS low-resolution grating G140L of two SSS in theLMC which have been proven to be accreting binary systems.These are the only two very luminous binary SSS which aresufficiently bright to be accessible with HST. Although werequest only two s/c orbits, these data will provide importantnew information about the central sources, the accretiondisks, and the winds in these systems. Understanding thenature of supersoft sources is not possible without high-quality data in the FUV. In particular, we wish to separatestellar and interstellar components of the absorption lines ofC II, Si II, Si III, Si IV, and N V, search for the presenceof stellar LyAlpha absorption and fainter emission orabsorption lines due to other ions, search for rotationalbroadening, derive elemental abundances, and test the combinedresults against current models of `Supersoft Sources'.

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