DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion

Details DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pasj...62..441h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.62, No.2, pp.441--445

Astronomy and Astrophysics

Astronomy

Binaries : Close, Binaries : Eclipsing, Stars: Evolution, Stars: Individual (Dm Delphini)

Scientific paper

The orbital period of the short-period eclipsing binary DM Del was analyzed by using two newly determined eclipse times together with the others compiled from the literature. It has been discovered that the period shows a long-time continuous decrease at a rate of dP/dt = -2.27 × 10-7d yr-1, while it undergoes a cyclic variation with a period of 31.73 years. Meanwhile, photometric light curves of a close binary in the B and V bands, published by Güdür et al., were analyzed with the 2003 version of the W-D code. It was found that the system is a semi-detached binary with a lobe-filling primary and a mass ratio of q = 0.55. The long-time period decrease can be explained by mass transfer from the primary to the secondary. This is consistent with the semi-detached configuration. The geometrical structure of the binary and the long-term period decrease suggest that DM Del may be a progenitor of an overcontact binary or just in a broken-contact stage predicted by thermal relaxation oscillations. A cyclic period change reveals the presence of a tertiary unseen companion that may play an important role in the formation of the close binary by removing angular momentum from the central system.

Affiliated with

Also associated with

No associations

Rating

DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion 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 DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1190472