Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage

Details Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..390z&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

Scientific paper

Short-period eclipsing binary systems with EB-type light variations are interesting objects for understanding the evolutionary changes undergone by close binaries. As investigated by many authors (Kalużny, J., Yamasaki, A., Zhai, D. S, Zhang, X. B Hilditch, R. W., McFarlane, T. M, King, D. J, Shaw, J. S., Samec, R. G., Niarchos, P. G., Oh, Kyu-Dong. etc ), a majority of them belong to an important subclass of close binaries called near-contact binaries (NCBs). According to the geometric definition of this subclass, NCBs actually comprise semi-detached, marginal-contact, and marginal-detached systems. They can be in the intermediate stage between detached or semi-detached state and contact state. Therefore, NCBs are the important observational targets which may be lying in key evolutionary states. In this paper, we observed and investigated several NCBs (BL And, GW Tau, RU UMi, GSC3658-0076, UU Lyn, AS Ser, IR Cas, EP Aur). Our results show that the orbital periods of BL And, GW Tau, RU UMi and UU Lyn are decreasing while that of IR Cas is decreasing and oscillating. The mechanisms that could explain the period variations are discussed. Combining the photometric solutions with period variations of these systems, we divide them into four types: BL And is a semi-detached system with the lobe filling primary, RU UMi and EP Aur are the semi-detached system with the lobe filling secondary, GW Tau, UU Lyn and AS Ser are the marginal contact system while GSC3658-0076 is the marginal detached system. Finally, the evolutionary stage of each system is discussed and some statistical relations of NCBs are presented.

Affiliated with

Also associated with

No associations

Rating

Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-Contact Binaries (NCB): Close Binary Systems in a Key Evolutionary Stage will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1811090