Untitled

Dryomova, G. N.; Свечников, М. А.

doi:10.1023/a:1020195701846

Cited by 4 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…P orb ≤ ), and W UMa-stars in a unified evolutionary chain [23,24], does predict a loss of orbital angular momentum. This should have an effect on the secular reduction in P orb .…”

Section: Resultsmentioning

confidence: 93%

“…The modern model for the origin and evolution of W UMa systems, which uses a theory of magnetic braking [18][19][20][21][22] ), and W UMa-stars in a unified evolutionary chain [23,24], reproduces the statistics of contact binaries among the field objects in a reasonable way [25][26][27]. The loss of orbital angular momentum owing to a magnetic stellar wind should have an effect on the secular reduction in P orb .…”

Section: Secular Variation In P Orbmentioning

confidence: 99%

See 1 more Smart Citation

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

Dryomova¹,

Свечников²

2006

Astrophysics

Self Cite

View full text Add to dashboard Cite

The secular variation in the orbital period P orb 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)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(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 P orb which alternates in sign independently of their division into A-and Wsubclasses. A statistical study of this sample in terms of the observed characteristics dP orb /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 dP orb /dt as a function of the mass interval of the primary component yields a more accurate value for the mass ratio,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.

show abstract

“…P orb ≤ ), and W UMa-stars in a unified evolutionary chain [23,24], does predict a loss of orbital angular momentum. This should have an effect on the secular reduction in P orb .…”

Section: Resultsmentioning

confidence: 93%

Section: Secular Variation In P Orbmentioning

confidence: 99%

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

Dryomova¹,

Свечников²

2006

Astrophysics

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is a young binary belonging to the main sequence, whose age is estimated to be a billion years. The components have not yet synchronized their spin rotation with the orbital revolution (Dryomova & Svechnikov 2012), and its eccentricity is quite large, 0.23. The apsidal period for this system was Table 1 Initial data for five remarkable binaries with the problem apsidal period taken from Svechnikov & Perevozkina (2004).…”

Section: Eclipsing Binary Ai Hyamentioning

confidence: 99%

Role of the Rossiter-McLaughlin effect in the study of close binaries

Dryomova

Dryomov

2019

Res. Astron. Astrophys.

View full text Add to dashboard Cite

This paper is devoted to binary stars belonging to the class of eclipsing-variable systems. Photometric and spectroscopic analysis of eclipses allows us to determine geometric parameters of the orbit and physical characteristics of stellar components as well as inclinations of stellar equators to the orbital plane. Estimations of inclinations can be obtained from measurement of the Rossiter-McLaughlin effect, which is discussed using examples of some eccentric binaries with an anomalous apsidal effect. Our task is to find the complete spectrum of solutions of the equation of apsidal motion, depending on the inclinations of the polar axes of the components to the orbital one for these systems, based on their individual spectroscopic and photometric observational data. The matrix of solutions allows us to select those pairs of polar inclinations that provide agreement with the observational apsidal period.

show abstract

“…(4) It should be interesting to test the conclusions in Dryomova & Svechnikov (1999) made after analyzing 153 DW-type binaries taken from the "Catalogue of the approximate photometric and absolute elements of the eclipsing variable stars" by Svechnikov & Kuznetsova (1990) and based on new data on the 31 pre-contact systems from the catalogue presented here. As shown in Dryomova & Svechnikov (1999) Svechnikov (1985) is used in the General Catalogue of the Variable Stars (see Kholopov et al 1985). The distinction between these two classes is the chromospheric and photospheric activity (which reveal themselves in numerous spots), sharply expressed in the case of DW-type binaries and barely noticeable (i.e.…”

Section: Description Of the Cataloguementioning

confidence: 99%

Catalogue of the orbital elements, masses, and luminosities for short-periodicRS CVn-type eclipsing systems

Dryomova¹,

Perevozkina²,

Свечников³

2005

A&A

View full text Add to dashboard Cite

Abstract. New data on the orbital elements, masses, and luminosities were collected for 31 pre-contact binary systems of shortperiodic RS CVn-type. We treat the catalogued data statistically in order to accurately define the properties and evolutionary status of each class system. The ages of pre-contact systems were estimated by the isochrone method. Numerous comments and bibliographic references to the catalogue are also included.

show abstract

Untitled

Cited by 4 publications

References 11 publications

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

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

Role of the Rossiter-McLaughlin effect in the study of close binaries

Catalogue of the orbital elements, masses, and luminosities for short-periodicRS CVn-type eclipsing systems

Contact Info

Product

Resources

About