Period changes and light curve analysis of eclipsing binary AB Andromedae

Hasanzadeh, A.; Jassur, D. M. Z.; Kermani, M. H.

doi:10.1007/s10509-008-9856-x

Cited by 5 publications

(5 citation statements)

References 15 publications

(18 reference statements)

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“…Our work corrected claims made by Li et al (2014), because we found an error in their determination of times of minima type for the old data. The results of the present study are similar in some respects with the results of Hasanzadeh et al (2008): also in their paper there are two periodical modulations of the times of minima.…”

Section: Discussionsupporting

confidence: 90%

“…Their luminosity variation in long time scales was ∆(L 1 + L 2 ) = 0.18L ⊙ . Hasanzadeh et al (2008) attributed the second modulation of the orbital period to the magnetic mechanism. The possible causes of orbital period modulations can be (at least, in principle) clarified using future CCD photometry, radial velocity, astrometric and direct observations.…”

Section: Discussionmentioning

confidence: 99%

“…AB And is a W UMa type eclipsing binary star found by Guthnick and Prager (1927). The primary star's mass and radius are nearly solar values, for the secondary they are approximately half the solar values (e.g., Pych et al, 2004, Hasanzadeh et al, 2008. Old photographic plates allowed to obtain times of minima of the AB And light curve since 1902, such that now there is a set of observations longer than one hundred years.…”

Section: Introductionmentioning

confidence: 99%

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Timing of AB And eclipses

Kozyreva¹,

Ibrahimov²,

Gaynullina³

et al. 2018

New Astronomy

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This study aims timing the eclipses of the short period low mass binary star AB And. The times of minima are taken from the literature and from our observations in October 2013 (22 times of minima) and in August 2014 (23 times of minima). We find and discuss an inaccuracy in the determination of the types of minima in the previous investigation by Li et al. (2014). We study the secular evolution of the central binary's orbital period and the possibility of the existence of third and fourth companions in the system.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Timing of AB And eclipses

Kozyreva¹,

Ibrahimov²,

Gaynullina³

et al. 2018

New Astronomy

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“…A majority of contact binary stars are found to have changes in their periods with Ṗ evenly distributed around zero and up to ± 2.3 × 10 −7 day year −1 , indicating that decreasing periods are not favored (Kubiak et al 2006). Systems like AB Andromedae (Hasanzadeh et al 2008), AH Virgo, and V566 Ophiuchus vary in their eclipse times by up to 2 hr. V502 Ophiuchus (Kalimeris et al 1994) is a contact binary with a period of 0.4533925 days that shows a 40 minute change in its O-C times, quite similar to KIC 9832227.…”

Section: Analysis and Discussionmentioning

confidence: 99%

KIC 9832227: Using Vulcan Data to Negate The 2022 Red Nova Merger Prediction

Socia,

Welsh,

Short

et al. 2018

Preprint

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KIC 9832227 is a contact binary whose 11 hr orbital period is rapidly changing. Based on the apparent exponential decay of its period, the two stars were predicted to merge in early 2022 resulting in a rare red nova outburst. Fortunately KIC 9832227 was observed in 2003 as part of the NASA Ames pre-Kepler Vulcan Project to search for transiting exoplanets. We find that the Vulcan timing measurement does not agree with the previous exponential decay model. This led us to re-evaluate the other early epoch non-Kepler data sets, the Northern Sky Variability Survey (NSVS) and Wide Angle Search for Planets (WASP) survey. We find that the WASP times are in good agreement with the previous prediction, but the NSVS eclipse time differs by nearly an hour. The very large disagreement of the Vulcan and NSVS eclipse times with an exponentially decaying model forces us to reject the merger hypothesis. Although period variations are common in contact binaries, the physical cause of the period changes in KIC 9832227 remains unexplained; a third star scenario is unlikely. This study shows the data collected by the Vulcan photometer to be extremely valuable for extending the baseline for measurements of variable stars in the Kepler field.

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“…As regards the work of the first investigators, a first application was made to AB And [113], while many others followed by various researches among whom some are mentioned [117][118][119][120][121][122][123][124][125]. In the application to AB And [113], it is clearly shown that from two different (O-C) diagrams -constructed using two different ephemeris formulae-the same results come out for the orbital period changes of this system analysed with the continuous method proposed in [114].…”

Section: Ways Of An (O-c) Diagram Analysismentioning

confidence: 99%

Study of Eclipsing Binaries: Light Curves & O-C Diagrams Interpretation

Rovithis‐Livaniou

2020

Galaxies

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The continuous improvement in observational methods of eclipsing binaries, EBs, yield more accurate data, while the development of their light curves, that is magnitude versus time, analysis yield more precise results. Even so, and in spite the large number of EBs and the huge amount of observational data obtained mainly by space missions, the ways of getting the appropriate information for their physical parameters etc. is either from their light curves and/or from their period variations via the study of their (O-C) diagrams. The latter express the differences between the observed, O, and the calculated, C, times of minimum light. Thus, old and new light curves analysis methods of EBs to obtain their principal parameters will be considered, with examples mainly from our own observational material, and their subsequent light curves analysis using either old or new methods. Similarly, the orbital period changes of EBs via their (O-C) diagrams are referred to with emphasis on the use of continuous methods for their treatment in absence of sudden or abrupt events. Finally, a general discussion is given concerning these two topics as well as to a few related subjects.

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Period changes and light curve analysis of eclipsing binary AB Andromedae

Cited by 5 publications

References 15 publications

Timing of AB And eclipses

Timing of AB And eclipses

KIC 9832227: Using Vulcan Data to Negate The 2022 Red Nova Merger Prediction

Study of Eclipsing Binaries: Light Curves & O-C Diagrams Interpretation

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