Abstract
A statistical survery of long period, say P ≳ 10 days, eclipsing binaries among all the known eclipsing binaries (over 3500 in number) yielded some 200 binaries (∼6%). Among such long period binaries the number of stars with radial velocities available is only 57 (∼21%), whose number is again reduced to half for those which have decent light curves. The overwhelming needs for intensive photometric observations to secure light curves for these long period systems which play an important role for understanding the nature of giants and supergiants led to the commencement in 1982 of a systematic long-term project of about 10 years at the Yonsei University Observatory. The results obtained in the last five years are presented.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
