scholarly journals KIC 10736223: An Algol-type Eclipsing Binary That Has Just Undergone the Rapid Mass-transfer Stage

2020 ◽  
Vol 895 (2) ◽  
pp. 136 ◽  
Author(s):  
Xinghao Chen ◽  
Xiaobin Zhang ◽  
Yan Li ◽  
Hailiang Chen ◽  
Changqing Luo ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Eclipsing Binary ◽  
Rapid Mass ◽  
Transfer Stage

scholarly journals LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX

2007 ◽  
Vol 3 (S250) ◽  
pp. 333-338
Author(s):  
J. L. Prieto ◽  
K. Z. Stanek ◽  
C. S. Kochanek ◽  
D. R. Weisz
Keyword(s):  
Mass Transfer ◽  
Surface Temperature ◽  
Light Curve ◽  
Mass Loss ◽  
Dwarf Galaxy ◽  
Evolutionary Stage ◽  
Eclipsing Binary ◽  
Contact Binary ◽  
Yellow Supergiant

AbstractIn a variability survey of M81 using the Large Binocular Telescope we have discovered a peculiar eclipsing binary (MV ≃ −7.1) in the field of the dwarf galaxy Holmberg IX. It has a period of 271 days and the light curve is well-fit by an overcontact model in which both stars are overflowing their Roche lobes. It is composed of two yellow supergiants (V − I ≃ 1 mag, Teff = 4800 K), rather than the far more common red or blue supergiants. Such systems must be rare. While we failed to find any similar systems in the literature, we did, however note a second example. The SMC F0 supergiant R47 is a bright (MV ≃ −7.5) periodic variable whose All Sky Automated Survey (ASAS) light curve is well-fit as a contact binary with a 181 day period. We propose that these massive systems are the progenitors of supernovae like SN 2004et and SN 2006ov, which appeared to have yellow progenitors. The binary interactions (mass transfer, mass loss) limit the size of the supergiant to give it a higher surface temperature than an isolated star at the same core evolutionary stage.

scholarly journals Period Variation Study and Light Curve Analysis of the Eclipsing Binary GSC 02013-00288

2016 ◽  
Vol 1 (2) ◽  
pp. 321-334 ◽  
Author(s):  
N.S. Awadalla ◽  
M.A. Hanna ◽  
M.N. Ismail ◽  
I.A. Hassan ◽  
M.A. Elkhamisy
Keyword(s):  
Mass Transfer ◽  
Curve Analysis ◽  
Light Curves ◽  
Mass Ratio ◽  
Late Type ◽  
Light Curve Analysis ◽  
Orbital Inclination ◽  
Eclipsing Binary ◽  
Massive Component ◽  
Period Decrease

AbstractWe analyzed the first set of complete CCD light curves of the W UMa type eclipsing binary IK Boo in the BVRI bands by using the PHOEBE code and deduced its first photometric parameters with, mass ratio q = 0.648 and orbital inclination i = 63o. We have applied a spotted model due to the light curves asymmetry. The system shows a distinct O’Connell effect. The best solution fit to the light curves suggested the influence of star spot(s) on both components. Such presence of star spot(s) is common among the RS CVn and W UMa chromospheric active late type stars.We also present an analysis of mid–eclipse time measurements of IK Boo. The analysis indicates a period decrease rate dP/dt = −1.68 × 10−7d/yr, which can be interpreted in terms of mass transfer of rate 3.1 × 10−7M⊙/yr, from the more massive to the less massive component.

scholarly journals ST Carinae, An Algol-Type System in a Possible State of Rapid Mass Exchange

1989 ◽  
Vol 107 ◽  
pp. 335-335
Author(s):  
C.R. Chambliss ◽  
R.L. Walker
Keyword(s):  
Mass Exchange ◽  
Type System ◽  
Primary Component ◽  
Roche Lobe ◽  
Mass Ratio ◽  
Eclipsing Binary ◽  
Additional Work ◽  
Wood Model ◽  
Rapid Mass ◽  
Substantial Uncertainty

ST Carinae is an eclipsing binary with a period of 0.90165 days and is believed to consist of an A0 V primary and a secondary of type F5 - 8 IV. About 900 observations in UBV, made by Somerville in 1963, but unreduced at that time, are analyzed with the Wood Model. These are also compared with the solutions obtained by previous investigators of this system. The solutions indicate a reasonably consistent geometry, but there is still substantial uncertainty with regard to the mass-ratio and dynamical status of the system. The possibility exists that ST CAR is in the initial and rapid stage of mass exchange in which the primary component fills its Roche lobe and is losing mass to its companion. The two components of ST CAR appear to be of normal dimensions, but additional work is needed to clarify the exact status of this system. It is planned that a re-analysis using the Simplex program will clarify the dynamical status of ST CAR.

scholarly journals The Active Algol Binary KZ Pavonis

2001 ◽  
Vol 18 (2) ◽  
pp. 140-147 ◽  
Author(s):  
E. Budding ◽  
S. C. Marsden ◽  
O. B. Slee
Keyword(s):  
Mass Transfer ◽  
Radio Emission ◽  
Transfer Process ◽  
Mass Transfer Process ◽  
Photometric Data ◽  
Optical Data ◽  
Eclipsing Binary ◽  
Multi Wavelength ◽  
Low Levels ◽  
The University

AbstractThe Algol type eclipsing binary KZ Pav has been observed over one complete orbit (0.95 days) with theAustraliaTelescope CompactArray. Contemporaneous optical photometric data from the University of Southern Queensland’s Observatory at Mount Kent were also collected and have been included in this multi-wavelength study.Preliminary indications are that the low levels of emission observed share similarities to those of some RS CVn binaries. The optical data show phase-linked effects which can be related to the mass transfer process of Algols. The possibility that the radio emission may be related to this process is considered.

scholarly journals Bubble behavior of fructooligosaccharides syrup during the belt drying process

2018 ◽  
Author(s):  
Lijuan Zhao ◽  
Dandan Wang ◽  
Tengfei Du ◽  
Junhong Yang ◽  
Jianguo Li ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Natural Convection ◽  
High Speed ◽  
Reference Value ◽  
Drying Rate ◽  
Drying Process ◽  
Bubble Behavior ◽  
Image Acquisition System ◽  
And Diffusion ◽  
Transfer Stage

This paper is aiming to study experimentally the bubbling and drying characteristic of fructooligosaccharides syrup in the belt drying process. A series of bubble images were acquired by a high-speed image acquisition system during the drying process. By analyzing the characteristics of bubble and drying, the drying process of fructooligosaccharides was divided into three periods: boiling transfer, natural convection and conduction and diffusion period. The drying rate in different transfer stage was: boiling transfer > natural convection > heat conduction and diffusion. The results of the study are of reference value to belt drying. Keywords: fructooligosaccharides; belt drying; digital image processing; heat and mass transfer

scholarly journals A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020

2021 ◽  
Author(s):  
S A Rappaport ◽  
D W Kurtz ◽  
G Handler ◽  
D Jones ◽  
L A Nelson ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Orbital Period ◽  
Mode Frequency ◽  
Prior History ◽  
Dipole Mode ◽  
Eclipsing Binary ◽  
Pulsation Mode ◽  
The Third ◽  
History Of ◽  
Binary Evolution

Abstract We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency of 21.09533 d−1. This pulsation exhibits a septuplet of orbital sidelobes as well as a harmonic quintuplet. Using the oblique pulsator model, the primary oscillation is identified as a sectoral dipole mode with l = 1, |m| = 1. We find the pulsating star to have M1 ≃ 2.5 M⊙, R1 ≃ 3 R⊙, and Teff, 1 ≃ 8000 K, while the secondary has M2 ≃ 1.1 M⊙, R2 ≃ 2 R⊙, and Teff, 2 ≃ 5600 K. Both stars appear to be close to filling their respective Roche lobes. The properties of this binary as well as the tidally tilted pulsations differ from the previous two tidally tilted pulsators, HD74423 and CO Cam, in important ways. We also study the prior history of this system with binary evolution models and conclude that extensive mass transfer has occurred from the current secondary to the primary.

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