Astronomy Astrophysics manuscript no. youngletter February 29, 2008 c ESO 2008 LETTER TO THE EDITOR Discovery of magnetic fields in the very young, massive stars W601 ( NGC 6611) and OI 201 ( NGC 2244) E. Alecian1, 2 , G.A. Wade1 , C. Catala2 , S. Bagnulo3 , T. Boehm4 , D. Bohlender5 , J.-C. Bouret6 , J.-F. Donati4 , C.P ... The Stokes V profile of this star does not vary over 5 days, suggesting a long rotational period, a pole-on orientation, or aligned magnetic and rotation axes. ...
... An analysis of series of flatfield exposures obtained in echelle mode adds support to the view that the performance of an instrument should be monitored closely and described quantitatively. ... This may result in confusion about basic instru mental parameters, the precision of the setup, the amount and distribution of calibration frames which are required and finally the assumptions on which the data reduction procedure should rely. ... The value for pure random noise is indicated 1). ...
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Ссылки http://www.stecf.org/conferences/adass/adassVII/reprints/decuyperjp.ps.gz -- 89.6 Кб -- 12.06.2006 Похожие документы
... Printed in U.S.A. THE METALLICITY OF STARS WITH CLOSE COMPANIONS Daniel Grether1 and Charles H. Lineweaver2 Received 2006 November 30; accepted 2007 July 5 ABSTRACT We examine the relationship between the frequency of close companions (stellar and planetary companions with orbital periods <5 yr) and the metallicity of their Sun-like ($FGK ) hosts. ... In contrast to the metallicity dependence of planetary companions, stellar companions tend to be more abundant around low-metallicity hosts. ... Fig. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/GretherLineweaver2007.pdf -- 693.4 Кб -- 04.11.2007 Похожие документы