Publ. Astron. Soc. Pac., 112, 354-358 (2000/March-0)
EC 11481-2303: a peculiar hot high-gravity pre-white dwarf.
STYS D., SLEVINSKY R., SION E.M., SAFFER R., HOLBERG J.B., O'DONOGHUE D., KILKENNY D., STOBIE R.S. and KOEN C.
Abstract (from CDS):
We report the discovery of a peculiar new hot high-gravity predegenerate star, EC 11481-2303 from the Edinburgh-Cape Blue Object Survey, based upon the analysis of far-UV International Ultraviolet Explorer (IUE) echelle and low-resolution spectra and an optical spectrum. The IUE spectra reveal the presence of far-UV photospheric/circumstellar high-ionization absorption features due to N V λλ1238, 1242, Si IV λλ1393, 1402, C IV λλ1548, 1550, and He II λ1640. The mean velocity of these features is -17.5 km.s–1. In addition, there is low-ionization interstellar absorption at an average velocity of -5.6 km.s–1. The interstellar lines are strong and imply a distance of more than 500 pc. The optical spectrum is dominated by Stark-broadened Balmer absorption, a sharp He II λ4686 feature, and the absence of Balmer members higher than H8. A best-fit model atmosphere to the optical data yields Teff=41,790 K and logg=5.84, suggesting an extended horizontal branch sdOB subdwarf. However, synthetic spectral fits to the far-UV spectrum do not provide a consistent fit to both the Lyα region and the far-UV continuum of EC 11481-2303. It is possible that EC 11481-2303 is an unresolved binary. Follow-up ground-based and far-UV studies are encouraged to discern the possible nature of any binary companion.
Stars: Subdwarfs - Stars: White Dwarfs
KPD 00005+5601 misprint for KPD 0005+5106
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