ELFT HÍRADÓ

[Uhlár Karola <uhlar AT konkoly.hu>]

*MTA CSFK CSI
RENDKÍVÜLI SZEMINÁRIUM*

Elo~adó:***Nancy R. Evans* (Harvard-Smithsonian Center for Astrophysics)

Elo~adás címe: ***Cepheids, Binaries, and Star Formation: Making the 
Connection * *
*
Kivonat:
Cepheids provide insight into both star formation and stellar evolution. 
Multiwavelength studies supply binary/multiple properties for these 
reasonably massive stars, which allows the exploration of differences 
between between high and low mass stars formation. A 3 part program to 
derive binary parameters is underway. We are conducting a survey of 
Cepheids with the Hubble Space Telescope Wide Field Camera 3 (WFC3) to 
identify possible resolved companions, for example Eta Aql. X-ray 
observations (Chandra and XMM-Newton) can confirm whether possible low 
mass companions are young enough to be physical companions of Cepheids, 
hence providing constraints on star formation. In a related study of 
intermediate mass stars, Chandra X-ray observations of late B stars in 
Tr 16 have been used to determine the fraction which have low mass 
companions (which are X-ray active in contrast to the late B stars which 
are X-ray quiet). Finally, velocity data from the Groynya, et al. is 
being combined with CORAVEL data develop statistics on long period orbits.

Elo~adás ido~pontja: *2013. augusztus 13. (kedd), 14:00**
*
Elo~adás helyszíne: MTA CSFK CSI Elo~adóterme
1121 Budapest, Konkoly T. M. út 15-17.
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org:Konkoly Observatory
adr:;;Konkoly Thege M. u. 13-17.;Budapest;;1121;Hungary
email;internet:uhlar AT konkoly.hu
title:secretary
tel;work:+3613919322
tel;fax:+3612754668
version:2.1
end:vcard