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The strange story of BI Lyncis: an extremely helium-rich \subdwarf" with a cool companion
 

Summary: The strange story of BI Lyncis:
an extremely helium-rich \subdwarf" with a cool companion
C.S. Je ery and R. Aznar Cuadrado
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
csj@star.arm.ac.uk, rea@star.arm.ac.uk
Abstract
BI Lyn = PG 0900+400 has been erroneously clas-
si ed as an evolved binary system containing either
a hot subdwarf or white dwarf and a thick accretion
disk. New intermediate dispersion spectra are pre-
sented which demonstrate that the hot component is
a luminous low-mass helium star and the cool com-
panion is a rapidly rotating G-type giant. Techniques
of spectrum synthesis have been used to establish
the dimensions of both components. Although the
orbital period of the system remains unknown, other
phenomena are entirely consistent with these observed
dimensions. The established  0:34d periodic pho-
tometric variation could be explained by pulsations
in the B-type primary and, by analogy with other

  

Source: Armagh Observatory
Jeffery, Simon - Armagh Observatory

 

Collections: Physics