NDLI: Variation in the orbital period of W UMa-type contact systems

Content Provider	Springer Nature Link
Author	Dryomova, G. N. Svechnikov, M. A.
Copyright Year	2006
Abstract	The secular variation in the orbital period Porb is studied as a function of the mass ratio q of the components in a sample of 73 contact systems of class W UMa constructed from a survey of current (1991–2003) published photometric and spectroscopic data. Almost all the W UMa-systems (>93% of this sample) are found to have a variation in their orbital periods Porb which alternates in sign independently of their division into A-and Wsubclasses. A statistical study of this sample in terms of the observed characteristics dPorb/dt and q showed that on the average the numbers of increases (35 systems) and decreases (33 systems) in the periods are the same, which indicates the existence of flows directed alternately from one component to the other and illustrates the cyclical character of the thermal oscillations. An analysis of the behavior of dPorb/dt as a function of the mass interval of the primary component yields a more accurate value for the mass ratio, q ≈ 0.4 ÷ 0.45 at which contact binaries are separated into A-and W-subclasses. No correlations were observed between the fill-out factor for the outer contact configuration, the total mass of the contact system, and the mass ratio of the components, on one hand, and the sign of the secular variation in the period. The physical properties and evolutionary features of these systems are discussed.
Starting Page	358
Ending Page	369
Page Count	12
File Format	PDF
ISSN	05717256
Journal	Astrophysics
Volume Number	49
Issue Number	3
e-ISSN	15738191
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	(stars:) contact systems-individual W UMa-type Astronomy, Astrophysics and Cosmology Astronomy Astrophysics Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

The active W UMa type binary star V781 Tau revisited

Variations in the brightness and polarization of W Cep

Energy Transfer in W UMa Systems

Comprehensive photometric study of the eclipsing binary AW UMa

FBS 2213+421: A dust-enshrouded long-period AGB Mira variable?

Trapezium type multiple stars — instable systems

Large-scale photometric activity of UX Ori type stars

Photometric and polarimetric studies of three W UMa-type binaries: FZ Ori, V407 Peg and LP UMa

Determination of orbital eccentricity

Variation in the orbital period of W UMa-type contact systems

Similar Documents

The active W UMa type binary star V781 Tau revisited

Variations in the brightness and polarization of W Cep

Energy Transfer in W UMa Systems

Comprehensive photometric study of the eclipsing binary AW UMa

FBS 2213+421: A dust-enshrouded long-period AGB Mira variable?

Trapezium type multiple stars — instable systems

Large-scale photometric activity of UX Ori type stars

Photometric and polarimetric studies of three W UMa-type binaries: FZ Ori, V407 Peg and LP UMa

Determination of orbital eccentricity

Variation in the orbital period of W UMa-type contact systems