publication . Preprint . Article . 2011

Binaries discovered by the SPY survey VI. Discovery of a low mass companion to the hot subluminous planetary nebula central star EGB\,5 - A recently ejected common envelope?

Geier, S.; Napiwotzki, R.; Heber, U.; Nelemans, G.A.;
Open Access English
  • Published: 23 Feb 2011
Abstract
Hot subdwarf B stars (sdBs) in close binary systems are assumed to be formed via common envelope ejection. According to theoretical models, the amount of energy and angular momentum deposited in the common envelope scales with the mass of the companion. That low mass companions near or below the core hydrogen-burning limit are able to trigger the ejection of this envelope is well known. The currently known systems have very short periods $\simeq0.1-0.3\,{\rm d}$. Here we report the discovery of a low mass companion ($M_{\rm 2}>0.14\,M_{\rm \odot}$) orbiting the sdB star and central star of a planetary nebula EGB\,5 with an orbital period of $16.5\,{\rm d}$ at a ...
Subjects
free text keywords: Astrophysics - Solar and Stellar Astrophysics
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publication . Preprint . Article . 2011

Binaries discovered by the SPY survey VI. Discovery of a low mass companion to the hot subluminous planetary nebula central star EGB\,5 - A recently ejected common envelope?

Geier, S.; Napiwotzki, R.; Heber, U.; Nelemans, G.A.;