Open European Journal on Variable stars最新文献_第2页

PROCEEDINGS OF THE 52nd CONFERENCE ON VARIABLE STARS RESEARCH 第52届变星研究会议论文集

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2021-0220

R. Kocián

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FIVE NEW FAINT CATACLYSMIC VARIABLES FROM THE ZWICKY TRANSIENT FACILITY 来自兹威基瞬变设施的五个新的微弱的灾难性变量

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2022-0228

C. Lloyd, K. Bernhard

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PROPERTIES OF THE RECENTLY DISCOVERED ECLIPSING BINARY GSC 03421-01402 最近发现的食双星GSC 03421-01402的性质

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2021-0221

C. Lloyd, James Screech

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CCD PHOTOMETRY, PERIOD ANALYSIS AND EVOLUTIONARY STATUS OF THE PULSATING VARIABLE TYC 3292-1328-1 脉动变量tyc 3292-1328-1的CCD光度测定、周期分析及演化状态

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2022-0223

K. Alton

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NEW CMOS PHOTOMETRY AND ARCHIVAL PHOTOGRAPHIC OBSERVATIONS OF THE W UMA STAR V752 CEN: EXTENDING THE O-C RECORD OF PERIOD CHANGES wuma v752中心的新cmos光度测量和档案摄影观测:延长周期变化的o-c记录

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2022-0224

J. Innis, D. Coates

{"title":"NEW CMOS PHOTOMETRY AND ARCHIVAL PHOTOGRAPHIC OBSERVATIONS OF THE W UMA STAR V752 CEN: EXTENDING THE O-C RECORD OF PERIOD CHANGES","authors":"J. Innis, D. Coates","doi":"10.5817/oejv2022-0224","DOIUrl":"https://doi.org/10.5817/oejv2022-0224","url":null,"abstract":"We present new CMOS Bayer g-band photometry of the southern W UMa star V752 Cen, presenting two new times of primary minimum, and use archival photographic photometry from the Bamberg Sky Survey (mid 1960s) and the Harvard plate collection (∼1890 to 1990) to extend the O-C diagram back in time to ∼1900. Earlier authors have reported a constant period from the earliest published photometry in 1970 to about the year 2000, when a sudden change occurred to an increasing period. The archival photographic record presented here indicates the period was effectively constant back to 1900. Our 2020 data are also consistent with reported period increase. The V752 Cen system is known from earlier work to be a W UMa binary orbiting a lower mass spectroscopic binary. Our preliminary calculations, based on the reported centre-of-mass velocity change of the W UMa binary, suggest the wide orbit may have a period near 245 d, and could give rise to a light-travel time-effect of order 0.02 d. This does not however appear to be consistent with the SuperWASP photometric O-C results. Hence we suggest that considerable uncertainty exists concerning the properties of the wide orbit.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"243 22 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":"125471654","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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26 NEW MIRA VARIABLES FROM THE ZTF SURVEY 来自ZTF调查的26个新mira变量

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2021-0218

B. Klaus, Stefan Hümmerich

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VARIABILITY OF L261 IN M 13 2013年l261的变异率

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2022-0222

Francisco Violat-Bordonau

{"title":"VARIABILITY OF L261 IN M 13","authors":"Francisco Violat-Bordonau","doi":"10.5817/oejv2022-0222","DOIUrl":"https://doi.org/10.5817/oejv2022-0222","url":null,"abstract":"After the discovery in April 2021 of the variability of the star L199 (now V63), belonging to the globular cluster Messier 13 (NGC 6205), between June and October 2021, we have studied twenty of the brightest stars, excluding the well-known red giant variables: surprisingly a good part of them shows some degree of variability in the range 0.05-0.25 magnitude in V band. In this work, we present light curves, average magnitudes, periods and amplitudes of the star L261 (2MASS J16413476+3627596), a red giant star located in the cluster, that we have studied using the CCD images obtained in the campaigns of 2019, 2020 and 2021, which we have joined the photometric measurements obtained by Osborn & Fuenmayor (1977), Kopacki et al. (2003), Deras et al. (2019) and ASAS-SN (from 2018 to 2021). The results suggest that this moderately bright star (average magnitude in 2021: 12.206 ± 0.027 V) is multiperiodic. It has at least two periods of different length which modulates its light curve over time: a period of variable duration (31 ± 5 days: between 26 and 36 days according to the campaign) joins another shorter (4.8 to 7.6 days) very marked in all the data sets used. With this discovery, Messier 13 now has 64 confirmed variable stars.","PeriodicalId":176387,"journal":{"name":"Open European Journal on Variable stars","volume":"2 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":"126782252","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}

引用次数: 0

DISCOVERY OF FOUR DELTA SCUTI STARS 发现四颗三角座星

Open European Journal on Variable stars Pub Date : 1900-01-01 DOI: 10.5817/oejv2022-0232

A. Liakos

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