Untitled

Gómez-Forrellad, Josep M.; Sánchez-Bajo, F.; Corbera-Subirana, M.; García-Melendo, E.; Vidal-Sainz, J.

doi:10.1023/a:1021324730755

Cited by 22 publications

(38 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the contrary, 7 systems, incluled to the current sample list have been identified as pulsating variables in HIP and later have been proven by different authors that they are genuine contact binaries. These systems are FI Boo , HI Dra and V351 Peg (Gomez-Forrellad et al 1999), ET Leo , V2357 Oph (Rucinski et al 2003), HH UMa , and NN Vir (Rucinski & Lu 1999). Their light elements (namely T 0 and P) and variability types were updated accordingly and marked with an explanatory b footnote in Table 1.…”

Section: Selection Of the Systemsmentioning

confidence: 99%

Key parameters of W UMa-type contact binaries discovered byHIPPARCOS

Selam

2004

A&A

View full text Add to dashboard Cite

Abstract.A sample of W UMa-type binaries which were discovered by the HIPPARCOS satellite was constructed with the aid of well defined selection criteria described in this work. The selection process showed up that several systems of which the variability types have been assigned as EB in HIPPARCOS catalogue are genuine contact binaries of W UMa-type. The light curves of the 64 selected systems based on HIPPARCOS photometry were analyzed with the aid of light curve synthesis method by Rucinski and their geometric elements (namely mass ratio q, degree of contact f , and orbital inclination i) were determined. The solutions were obtained for the first time for many of the systems in the sample and would be a good source for their future light curve analyses based on more precise follow-up observations.

show abstract

Section: Selection Of the Systemsmentioning

confidence: 99%

Key parameters of W UMa-type contact binaries discovered byHIPPARCOS

Selam

2004

A&A

View full text Add to dashboard Cite

show abstract

“…A new photometric study (Gómez-Forrellad et al 2003) provided five minima timings. The analysis of these minima showed a linear trend of positive O − C residuals, leading to a new estimate of the period of 0.4775492(3) days, slightly greater that the period listed by HIPPARCOS.…”

Section: Vw Lmimentioning

confidence: 99%

Photometric study of the W UMa eclipsing binaries VW LMi and BX Dra

Sánchez-Bajo

García-Melendo

Gómez-Forrellad³

2007

Astrophys Space Sci

Self Cite

View full text Add to dashboard Cite

New ephemeris and the absolute parametersmasses, radii and luminosities-of the contact systems VW LMi and BX Dra have been obtained, by means of the analysis of the minima data available in the literature (for the determination of the ephemeris) and combining the previously published spectroscopic information and the results of the Wilson-Devinney method using photometric data (for the determination of the absolute parameters). The VW LMi O − C analysis confirms the multiplicity of the system detected previously from the spectroscopic data. Masses of the VW LMi contact system primary and secondary components are 1.67 ± 0.02M and 0.70 ± 0.02M , respectively. The corresponding radii are 1.709 ± 0.007R and 1.208 ± 0.006R , respectively. For the BX Dra contact system the masses are 2.19 ± 0.13M and 0.63 ± 0.06M , and the radii, 2.13 ± 0.04R and 1.26 ± 0.03R , for the primary and secondary, respectively. In both cases, the estimated luminosities seem to be slightly greater that the values derived from the Hipparcos distances.

show abstract

“…Later on, the system was observed by Gomez-Forrellad & Garcia-Melendo (1997) in March and April 1997 in the V passband. The authors classified the system as an eclipsing binary, noted a large O'Connell effect of Δmag = −0.1 mag and determined the following ephemeris for the primary minimum: HJD 2 450 525.5234 + 1.056×E, where E is epoch of the minimum.…”

Section: Introductionmentioning

confidence: 95%

O'Connell effect in early‐type contact binaries: DU Boo and AG Vir

et al. 2011

View full text Add to dashboard Cite

The paper presents new photoelectric observations of the eclipsing binary systems DU Boo and AG Vir. The systems are somewhat similar -both are A-type contact binaries with the maximum following the primary minimum being the brighter one. This light curve asymmetry is extremely temporally stable. The phase dependence of the color indices is unexpectedly small for the observed amplitude of the O'Connell effect, amounting to about 0.1 mag in the optical wavelength range which indicates a very large heated area with a temperature contrast of ΔT ≈ 1000-1500 K. The broadening functions (BFs) of the systems do not show any dark solar-type photospheric spots. On the other hand, there are significant differences of BFs between the quadratures (surprisingly similar in both systems) indicative of stream of matter or bright region causing additional emission seen between the components around the phase 0.25. Absolute parameters of the components slightly depend on the adopted model. Long orbital period of both contact binaries combined with late spectral type indicate that the primary components of either of the systems (but particularly in case of DU Boo) already evolved off the main sequence.

show abstract

Untitled

Cited by 22 publications

References 4 publications

Key parameters of W UMa-type contact binaries discovered byHIPPARCOS

Key parameters of W UMa-type contact binaries discovered byHIPPARCOS

Photometric study of the W UMa eclipsing binaries VW LMi and BX Dra

O'Connell effect in early‐type contact binaries: DU Boo and AG Vir

Contact Info

Product

Resources

About