{"title":"CANDIDATE TRIPLE-STAR SYSTEM WITH ELLIPSOIDAL COMPONENTS DETECTED IN VULPECULA THROUGH TESS PHOTOMETRY","authors":"G.Conzo, M.Moriconi, I.Peretto","doi":"10.5817/OEJV2023-0235","DOIUrl":"https://doi.org/10.5817/OEJV2023-0235","url":null,"abstract":"MaGiV-1 is a candidate triple ellipsoidal star system in Vulpecula at coordinates RA(J2000) 19 : 52 : 19.13 and DEC(J2000) +23 : 29 : 59.7 classified as ELL+ELL, number 2344411 in AAVSO VSX database. Through photometry from the TESS Space Telescope, two significant periods describing the orbital times of the components were identified using the Fourier transform. The analysis led to determining PA-BC = (4.269 � 0.213) d the orbital period of the A-BC pair, the primary component with the secondary component described by another pair, and PBC = (0.610 � 0.031) d the orbital period of the BC pair, the inner ellipsoidal system. However, it cannot be completely ruled out that the shorter period can be explained by pulsations of one of the two components (e.g. by the GDOR type).","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128971633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M.S. Brincat, C. Galdies, W. Grech, F. Tavakkoli, K. Hills
{"title":"A PHOTOMETRIC STUDY OF THE ACTIVE EW/RS BINARY STAR SYSTEM: GSC 05586-00371","authors":"M.S. Brincat, C. Galdies, W. Grech, F. Tavakkoli, K. Hills","doi":"10.5817/oejv2022-0231","DOIUrl":"https://doi.org/10.5817/oejv2022-0231","url":null,"abstract":"GSC 05586-00371 is a fast-rotating (Prot ≈ 0.44 days) eclipsing binary. Our study showed that this star system is an overcontact eclipsing binary star that belongs to the W UMa class with characteristics of RS CVn type stars. We studied this binary system by photometric means through the V and I bandpass where data by the ASAS-SN survey have also been utilized. our photometry yielded a more precise orbital period that was obtained on its discovery. ASAS-SN data over a 6-year period revealed a long-term photometric wave that is attributed to star spot activity. We monitored the binary system over a 73-hour monitoring period to detect any possible flares from the system, where two consecutive events were monitored from one of our observing stations. Through the use of the Wilson-Devinney program as applied by Binary Maker 3.0, we have obtained a model for this binary system that reveals the presence of star spots on both components. Our results show that the star spot activity is rather dynamic where their influence on the system’s light output changed on seasonal timescales.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"43 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121753998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yojiro Ogane, O. Ohshima, D. Taniguchi, N. Takanashi
{"title":"UBVRI PHOTOMETRY OF BETELGEUSE OVER 23 YEARS SINCE 1999","authors":"Yojiro Ogane, O. Ohshima, D. Taniguchi, N. Takanashi","doi":"10.5817/OEJV2022-0233","DOIUrl":"https://doi.org/10.5817/OEJV2022-0233","url":null,"abstract":"We report the results of our continuous UBVRI-band photometry of Betelgeuse from 1999 to 2022 using the same photometric system. There are two advantages in our observation: (1) we used a photodiode as a detector to avoid saturation, and (2) our data set includes U-band light curve, which is not widely observed in recent CCD photometries. Using our light curves, we conducted the periodicity analysis, and found ~405- and ~2160- day periods. We also discuss the tentative detection of a long-period variation over 20 years or longer. Finally, we discuss the peculiar variation of the U - B color index during the 'Great Dimming' event between late 2019 and early 2020.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114321056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"\"NEW SEMIREGULAR VARIABLE STAR NEAR THE WIZARD NEBULA - EVOLUTION OF THE RED GIANT \"\"MACOMP_V1\"\"\"","authors":"G. Conzo, M. Moriconi, P. Marotta","doi":"10.5817/OEJV2022-0229","DOIUrl":"https://doi.org/10.5817/OEJV2022-0229","url":null,"abstract":"The red giant MaCoMP_V1 in Cepheus at coordinates RA (J2000) 22:49:05:49 DEC (J2000) +57:52:41:6 is a semiregular variable star classified as SRS, number 2225960 in the AAVSO VSX database. Using the Fourier transform, the period P = (24.7510±0.062)d was evaluated and, with the support of the ASAS-SN and ZTF surveys, a well-defined light curve was made. The analysis resulted in the fundamental physical parameters of MaCoMP_V1, such as the mass M = (4.97±0.38)M(Sun) and radius R = (40.5±6.7)R(Sun), with consistent values suggesting the characteristics of a semiregular red giant. In addition, the effective temperature Teff = (4500±135)K from the Gaia catalog and the stellar evolution based on the Schönberg- Chandraskehar limit was estimated.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133125003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Nesci, I. Soszy'nski, Taavi Tuvikene INAFIAPS-Roma, Roma, Italy., W. U. Observatory, Warszawa, Poland., Tartu Observatory, University of Tartu, Toravere, Estonia.
{"title":"PERIOD CHANGES OF MIRA VARIABLES IN THE M16-M17 REGION","authors":"R. Nesci, I. Soszy'nski, Taavi Tuvikene INAFIAPS-Roma, Roma, Italy., W. U. Observatory, Warszawa, Poland., Tartu Observatory, University of Tartu, Toravere, Estonia.","doi":"10.5817/OEJV2022-0230","DOIUrl":"https://doi.org/10.5817/OEJV2022-0230","url":null,"abstract":"We analyzed the light curves of 165 AGB variables, mostly Miras, in the sky area centered between M16 and M17 (l = 16, b = 0), using the OGLE GVS database in the IC band. Comparison with the published light curves, derived about 50 years earlier by P. Maffei using Kodak I-N photographic plates, allowed us to find no significant period changes in any star. Remarkably, a few stars of the sample appear to have substantially changed their average luminosity, the most striking case being KZ Ser. We provide a better identification for three stars: IX Ser, NSV 10522, and NSV 10326, all of them being Miras. We classify the light curves of 6 stars, discovered but not classified by Maffei, (GL Ser, NSV 10271, NSV 10326, NSV 10522, NSV 10677, and NSV 10772) five of them being new Miras, and confirm the R CrB nature of V391 Sct. The magnitude scale used by Maffei is compared to the modern IC one.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131290079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Nesci, Gianni Rocchi INAFIAPS-Roma, Gruppo Astrofili Monte Subasio
{"title":"SEARCH FOR PERIOD CHANGES IN MIRA STARS","authors":"R. Nesci, Gianni Rocchi INAFIAPS-Roma, Gruppo Astrofili Monte Subasio","doi":"10.5817/OEJV2021-0216","DOIUrl":"https://doi.org/10.5817/OEJV2021-0216","url":null,"abstract":"We reobserved in the RC and i(Sloan) bands, during the years 2020-2021, seven Mira variables in Cassiopeia, for which historical i(Sloan) light curves were available from Asiago Observatory plates taken in the years 1967-84. The aim was to check if any of","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124663273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CONFIRMATION OF SEVEN FAINT ATLAS VARIABLE STAR CANDIDATES","authors":"N. Thomas, Celina Guan","doi":"10.5817/OEJV2021-0214 10.5817/OEJV2021-0214 10.5817/OEJV2021-0214 10.5817/OEJV2021-0214","DOIUrl":"https://doi.org/10.5817/OEJV2021-0214 10.5817/OEJV2021-0214 10.5817/OEJV2021-0214 10.5817/OEJV2021-0214","url":null,"abstract":"A pilot survey conducted at the Lookout Observatory has confirmed seven faint (V ~ 13 to 17) variables in the region of Kepler-76b that were recently discovered by the Asteroid Terrestrial-Impact Last Alert System (ATLAS). The ATLAS survey identified 315,000 probably variables within its wide-field survey in 2018. The faintness (down to r ~ 18) and small amplitudes (down to 0.02 mag) included in these candidates makes external validation difficult. Our confirmation of seven such variable stars gives credibility to the ATLAS list. Further, the agreement between various surveys and LO data validates the use of our new survey for variable star and exoplanet research.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115545399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Hovnkov'a, J. Juryvsek, M. Lehk'y, L. vSmelcer, M. Mavsek, J. Mazanec, D. Hanvzl, M. Urban'ik, M. Magris, M. Vravst'ak, F. Walter, B. Hlad'ik, T. Medulka, F. B'ilek, J. Trnka, J. Jacobsen, J. Ben'avcek, B. Kuchvt'ak, M. Audejean, Y. Ogmen, M. Z'ibar, P. Fatka, F. Marchi, S. Poddan'y, C. Quiñones, L. Tapia, F. Scaggiante, D. Zardin, G. Corfini, P. H'ajek, F. Lomoz, J. Mravik, J. Grnja, F. Campos, J. vCaloud, N. Esseiva, S. Jakvs, M. Hornik, J. Filip, R. Uhl'avr, F. Mina, R. Artola, J. Zalazar, D. Muller, P. Pintr, L. Divivsov'a
{"title":"B.R.N.O. CONTRIBUTIONS #41 - TIMES OF MINIMA","authors":"K. Hovnkov'a, J. Juryvsek, M. Lehk'y, L. vSmelcer, M. Mavsek, J. Mazanec, D. Hanvzl, M. Urban'ik, M. Magris, M. Vravst'ak, F. Walter, B. Hlad'ik, T. Medulka, F. B'ilek, J. Trnka, J. Jacobsen, J. Ben'avcek, B. Kuchvt'ak, M. Audejean, Y. Ogmen, M. Z'ibar, P. Fatka, F. Marchi, S. Poddan'y, C. Quiñones, L. Tapia, F. Scaggiante, D. Zardin, G. Corfini, P. H'ajek, F. Lomoz, J. Mravik, J. Grnja, F. Campos, J. vCaloud, N. Esseiva, S. Jakvs, M. Hornik, J. Filip, R. Uhl'avr, F. Mina, R. Artola, J. Zalazar, D. Muller, P. Pintr, L. Divivsov'a","doi":"10.5817/OEJV2021-0211","DOIUrl":"https://doi.org/10.5817/OEJV2021-0211","url":null,"abstract":"This paper presents 2109 times of minima for 965 objects acquired by 59 members and cooperating observers of the Variable Star and Exoplanet Section of the Czech Astronomical Society (B.R.N.O. Observing project).These observations were submitted to the website of the Variable Star and Exoplanet Section of the Czech Astronomical Society between November 2016 and March 2018.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125222398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Berthold, K. Häussler, D. Hunger, B. Jacobs, J. Steingrüber
{"title":"CR DEL - LONG TERM INVESTIGATION OF PERIOD BEHAVIOUR","authors":"T. Berthold, K. Häussler, D. Hunger, B. Jacobs, J. Steingrüber","doi":"10.5817/oejv2022-0227","DOIUrl":"https://doi.org/10.5817/oejv2022-0227","url":null,"abstract":"Almost 80 years of photometric history of this RRc type variable star are presented. The period has found to be stable with a likely trend to increase typical for that type of stars.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115395655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"TIMES OF MINIMA OF THE ECLIPSING BINARY V0674 LYR","authors":"R. Karimov, B. Hafizov, O. Burhonov","doi":"10.5817/oejv2022-0225","DOIUrl":"https://doi.org/10.5817/oejv2022-0225","url":null,"abstract":"We present 43 times of minima for the W Ursae Majoris type eclipsing binary V0674 Lyr. The observations were obtained using the Zeiss-600 telescope at the Maidanak astronomical observatory in Uzbekistan from 2018 to 2020.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132387245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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