Migrating Waves in Solar-Type Short-Period Eclipsing Binaries

1983 ◽  
pp. 393-394 ◽  
Author(s):  
L. Milano ◽  
G. Russo ◽  
S. Mancuso
Keyword(s):  
Eclipsing Binaries ◽  
Short Period ◽  
Solar Type

scholarly journals The Evolutionary Status of Short-Period RS CVn and Related W UMa Eclipsing Binaries

1983 ◽  
Vol 71 ◽  
pp. 463-464 ◽  
Author(s):  
G. Russo ◽  
L. Milano ◽  
S. Mancuso
Keyword(s):  
Eclipsing Binaries ◽  
Evolutionary Status ◽  
Type Activity ◽  
Rs Cvn Stars ◽  
Short Period ◽  
Solar Type

Among the RS CVn stars showing solar-type activity, with spectral types ranging from F to K and total masses up to 4 M⊙, there are two peculiar groups with period less than one day:a)agroup with components well inside their Roche lobes (Short-Period-Group, hereinafter SPG) and b) a group with their components in a thin or marginal degree of contact, with lightcurves of W UMa-W type (hereinafter WWG).

scholarly journals The asymmetric light curves of the GSC 2764 1417 (And), GSC 3355 0394 (Per) and GSC 2537 0520 (Psc)

2009 ◽  
Vol 5 (S264) ◽  
pp. 75-77
Author(s):  
Ronald G. Samec ◽  
Evan R. Figg ◽  
Reid Melton ◽  
Christa M. Labadorf ◽  
Jess Miller ◽  
...  
Keyword(s):  
Eclipsing Binaries ◽  
Light Curves ◽  
Close Binaries ◽  
Short Period ◽  
Solar Type

AbstractSolar-type variability is enhanced in short period close binaries with increased dynamo driven activity. This activity is studied in our analysis of recent light curves taken of the newly discovered eclipsing binaries GSC 2764 1417 (And), GSC 3355 0394 (Per) and GSC 2537 0775 (CVn).

scholarly journals Migrating Waves in Solar-Type Short-Period Eclipsing Binaries

1983 ◽  
Vol 71 ◽  
pp. 393-394
Author(s):  
L. Milano ◽  
G. Russo ◽  
F. Mardirossian ◽  
S. Mancuso
Keyword(s):  
Orbital Period ◽  
Broad Band ◽  
Eclipsing Binaries ◽  
Light Variation ◽  
Short Period ◽  
Total Light ◽  
Solar Type

One of the properties of RS CVn-like binaries is the presence of cyclic fluctuations, sometimes called “migrating waves”, in the V and other broad-band lightcurves. These fluctuations, perhaps due to spots, vary in amplitudes and periods, in the sense that, the longer the orbital period of the RS CVn system, the higher the amplitude of the “wave”, which may be up to 30-35% of the total light variation. Therefore, in short-period (less than one day) RS CVn binaries, these fluctuations are generally difficult to be detected.

scholarly journals SuperWASP variable stars: classifying light curves using citizen science

2021 ◽  
Vol 502 (1) ◽  
pp. 1299-1311
Author(s):  
Heidi B Thiemann ◽  
Andrew J Norton ◽  
Hugh J Dickinson ◽  
Adam McMaster ◽  
Ulrich C Kolb
Keyword(s):  
Variable Stars ◽  
Eclipsing Binaries ◽  
Light Curves ◽  
Data Set ◽  
Resultant Data ◽  
Sky Survey ◽  
Short Period ◽  
Contact Binaries ◽  
Analysis Of Results

ABSTRACT We present the first analysis of results from the SuperWASP variable stars Zooniverse project, which is aiming to classify 1.6 million phase-folded light curves of candidate stellar variables observed by the SuperWASP all sky survey with periods detected in the SuperWASP periodicity catalogue. The resultant data set currently contains >1 million classifications corresponding to >500 000 object–period combinations, provided by citizen–scientist volunteers. Volunteer-classified light curves have ∼89 per cent accuracy for detached and semidetached eclipsing binaries, but only ∼9 per cent accuracy for rotationally modulated variables, based on known objects. We demonstrate that this Zooniverse project will be valuable for both population studies of individual variable types and the identification of stellar variables for follow-up. We present preliminary findings on various unique and extreme variables in this analysis, including long-period contact binaries and binaries near the short-period cut-off, and we identify 301 previously unknown binaries and pulsators. We are now in the process of developing a web portal to enable other researchers to access the outputs of the SuperWASP variable stars project.

First photometric investigation of two short-period eclipsing binaries ASAS J105115-6032.1 and GDS J1056047-604149

New Astronomy ◽  
2022 ◽  
pp. 101756
Author(s):  
Fu-Xing Li ◽  
Nian-Ping Liu ◽  
Boonrucksar Soonthornthum ◽  
Thawicharat Sarotsakulchai
Keyword(s):  
Eclipsing Binaries ◽  
Short Period ◽  
Photometric Investigation

scholarly journals An ultra-short period rocky super-Earth orbiting the G2-star HD 80653

2020 ◽  
Vol 633 ◽  
pp. A133 ◽  
Author(s):  
G. Frustagli ◽  
E. Poretti ◽  
T. Milbourne ◽  
L. Malavolta ◽  
A. Mortier ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Thermal Emission ◽  
Earth Planet ◽  
Period Orbit ◽  
Short Period ◽  
Orbital Phase ◽  
Solar Type ◽  
Radial Velocity Data

Ultra-short period (USP) planets are a class of exoplanets with periods shorter than one day. The origin of this sub-population of planets is still unclear, with different formation scenarios highly dependent on the composition of the USP planets. A better understanding of this class of exoplanets will, therefore, require an increase in the sample of such planets that have accurate and precise masses and radii, which also includes estimates of the level of irradiation and information about possible companions. Here we report a detailed characterization of a USP planet around the solar-type star HD 80653 ≡EP 251279430 using the K2 light curve and 108 precise radial velocities obtained with the HARPS-N spectrograph, installed on the Telescopio Nazionale Galileo. From the K2 C16 data, we found one super-Earth planet (Rb = 1.613 ± 0.071 R⊕) transiting the star on a short-period orbit (Pb = 0.719573 ± 0.000021 d). From our radial velocity measurements, we constrained the mass of HD 80653 b to Mb = 5.60 ± 0.43 M⊕. We also detected a clear long-term trend in the radial velocity data. We derived the fundamental stellar parameters and determined a radius of R⋆ = 1.22 ± 0.01 R⊙ and mass of M⋆ = 1.18 ± 0.04 M⊙, suggesting that HD 80653 has an age of 2.7 ± 1.2 Gyr. The bulk density (ρb = 7.4 ± 1.1 g cm−3) of the planet is consistent with an Earth-like composition of rock and iron with no thick atmosphere. Our analysis of the K2 photometry also suggests hints of a shallow secondary eclipse with a depth of 8.1 ± 3.7 ppm. Flux variations along the orbital phase are consistent with zero. The most important contribution might come from the day-side thermal emission from the surface of the planet at T ~ 3480 K.

Photometric investigation of eight ultra-short period eclipsing binaries from OGLE

2020 ◽  
Vol 20 (8) ◽  
pp. 113
Author(s):  
D. Shanti Priya ◽  
P. Ravi Raja ◽  
J. Rukmini ◽  
M. Raghu Prasad ◽  
Vineet S. Thomas
Keyword(s):  
Eclipsing Binaries ◽  
Short Period ◽  
Photometric Investigation

scholarly journals A survey for high-mass eclipsing binaries

2019 ◽  
Vol 490 (4) ◽  
pp. 5147-5173
Author(s):  
F Pozo Nuñez ◽  
R Chini ◽  
A Barr Domínguez ◽  
Ch Fein ◽  
M Hackstein ◽  
...  
Keyword(s):  
Eclipsing Binaries ◽  
Light Curves ◽  
High Mass ◽  
System Component ◽  
Fundamental Parameters ◽  
Average Value ◽  
Short Period ◽  
Orbital Periods ◽  
Photometric Monitoring ◽  
Period System

ABSTRACT We report results from a search for Galactic high-mass eclipsing binaries. The photometric monitoring campaign was performed in Sloan r and i with the robotic twin refractor RoBoTT at the Universitätssternwarte Bochum in Chile and complemented by Johnson UBV data. Comparison with the SIMBAD data base reveals 260 variable high-mass stars. Based on well-sampled light curves, we discovered 35 new eclipsing high-mass systems and confirm the properties of six previously known systems. For all objects, we provide the first light curves and determine orbital periods through the Lafler–Kinman algorithm. Apart from GSC 08173-0018 and Pismis 24-13 ($P = 19.47\, d$ and $20.14\, d$) and the exceptional short-period system TYC 6561-1765-1 ($P = 0.71\, d$), all systems have orbital periods between 1 and 9 d. We model the light curves of 26 systems within the framework of the Roche geometry and calculate fundamental parameters for each system component. The Roche lobe analysis indicates that 14 systems have a detached geometry, while 12 systems have a semidetached geometry; seven of them are near-contact systems. The deduced mass ratios q = M2/M1 reach from 0.4 to 1.0 with an average value of 0.8. The similarity of masses suggests that these high-mass binaries were created during the star formation process rather than by tidal capture.

Orbital parameters and period variation studies of the short-period eclipsing binaries FG Sct, VZ Lib and VZ Psc

2019 ◽  
Vol 19 (7) ◽  
pp. 097 ◽  
Author(s):  
Qiang Yue ◽  
Li-Yun Zhang ◽  
Xian-Ming L. Han ◽  
Hong-Peng Lu ◽  
Liu Long ◽  
...  
Keyword(s):  
Eclipsing Binaries ◽  
Period Variation ◽  
Orbital Parameters ◽  
Short Period
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