Massive unseen companions to hot faint underluminous stars from SDSS MUCHFUSS - Analysis of seven close subdwarf B binaries - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




Massive unseen companions to hot faint underluminous stars from SDSS MUCHFUSS - Analysis of seven close subdwarf B binaries - Astrophysics > Solar and Stellar Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The project Massive Unseen Companions to Hot Faint Underluminous Stars fromSDSS MUCHFUSS aims at finding hot subdwarf stars with massive compactcompanions like massive white dwarfs M > 1.0 Msun, neutron stars or stellarmass black holes. The existence of such systems is predicted by binaryevolution theory and recent discoveries indicate that they exist in our Galaxy.First results are presented for seven close binary sdBs with short orbitalperiods ranging from 0.21 d to 1.5 d. The atmospheric parameters of all objectsare compatible with core helium-burning stars. The companions are most likelywhite dwarfs. In one case the companion could be shown to be a white dwarf bythe absence of light-curve variations. However, in most cases late type mainsequence stars cannot be firmly excluded. Comparing our small sample with theknown population of close sdB binaries we show that our target selection methodaiming at massive companions is efficient. The minimum companion masses of allbinaries in our sample are high compared to the reference sample of known sdBbinaries.



Autor: S. Geier, P. F. L. Maxted, R. Napiwotzki, R. H. Oestensen, U. Heber, H. Hirsch, T. Kupfer, S. Mueller, A. Tillich, B. N. Barlow,

Fuente: https://arxiv.org/







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