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您的检索式：作者名="Edwin Budding"
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| 1 | BVRI photometric observations,light curve solutions and orbital period analysis of BF Pav显示文摘A new ephemeris,period change analysis and light curve modeling of the W UMa-type eclipsing binary BF Pav are presented in this study.Light curves of the system taken in BVRI filters from two observatories,in Australia and Argentina,were modeled using the Wilson-Devinney code.The results of this analysis demonstrate that BF Pav is a contact binary system with a photometric mass ratio q=1.460 ± 0.014,a fillout factor f=12.5%,an inclination of 87.97 ± 0.45 deg and a cold spot on the secondary component.By applying the distance modulus formula,the distance of BF Pav was calculated to be d=268 ± 18 pc which is in good agreement with the Gaia EDR3 distance.We obtain an orbital period increase at a rate of 0.142 s century-1 due to a quadratic trend in the O-C diagram.Also,an alternative sudden period jump probably occurred which could be interpreted as a rapid mass transfer from the lower mass star to its companion of about ΔM=2.45 × 10-6 M⊙.Furthermore,there is an oscillatory behavior with a period of 18.3±0.3 yr.Since BF Pav does not seem to have significant magnetic activity,this behavior could be interpreted as the light-time effect caused by an undetected third body in this system.In this case,the probability for the third body to be a low mass star with M≥ 0.075 M⊙or a brown dwarf is 5.4% and 94.6% respectively.If we assume i’=90°,a3=8.04±0.33 AU.The mass of the secondary component was also determined following two different methods which result close to each other. | Atila Poro Fahri Alicavus Eduardo Fernández-Lajús Fatemeh Davoudi PegahSadat MirshafieKhozani Mark G.Blackford Edwin Budding Behjat Zarei Jalalabadi Jabar Rahimi Farzaneh Ahangarani Farahani | 2021 | Research in Astronomy and Astrophysics2021，21，8： | 0 |
| 2 | Absolute parameters of young stars:PU Pup显示文摘We present combined photometric and spectroscopic analyses of the southern binary star PU Pup.High-resolution spectra of this system were taken at the University of Canterbury Mt.John Observatory in the years 2008 and again in 2014-2015.We find the light contribution of the secondary component to be only 2%of the total light of the system in optical wavelengths,resulting in a single-lined spectroscopic binary.Recent TESS data revealed grazing eclipses within the light minima,though the tidal distortion,examined also from Hipparcos data,remains the predominating light curve effect.Our model shows PU Pup to have the more massive primary relatively close to filling its Roche lobe.PU Pup is thus approaching the rare‘fast phase’of interactive(Case B)evolution.Our adopted absolute parameters are as follows:M_(1)=4.10(±0.20)M_(⊙),M_(2)=0.65(±0.05)M_(⊙),R_(1)=6.60(±0.30)R_(⊙),R_(2)=0.90(±0.10)R_(⊙);T_(1)=11500(±500)K,T_(2)=5000(±350)K;photometric distance=186(±20)pc,age=170(±20)Myr.The less-massive secondary component is found to be significantly oversized and overluminous compared to standard main sequence models.We discuss this discrepancy referring to heating from the reflection effect. | Ahmet Erdem Derya Surgit Timothy S.Banks Burcu Ozkardes Edwin Budding | 2021 | Research in Astronomy and Astrophysics2021，21，10： | 0 |
| 3 | 天文光度学介绍显示文摘现在,专业天文学家必须拥有运用望远镜和在全波长段对数据分析解释的能力,以及在观察特定的谱域,掌握一定技巧和操作特定型号设备的能力。这就使得天文学家们必须有一些手册作为辅助。 | Edwin Budding Osman Demircan 张有兵 | 2008 | 国外科技新书评介2008，，5： | 0 |
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