{"id":"https://openalex.org/W2018000274","doi":"https://doi.org/10.1086/112750","title":"Starspots and the rotation of the flare star EV Lac","display_name":"Starspots and the rotation of the flare star EV Lac","publication_year":1980,"publication_date":"1980-07-01","ids":{"openalex":"https://openalex.org/W2018000274","doi":"https://doi.org/10.1086/112750","mag":"2018000274"},"language":"en","primary_location":{"id":"doi:10.1086/112750","doi":"https://doi.org/10.1086/112750","is_oa":false,"landing_page_url":"https://doi.org/10.1086/112750","pdf_url":null,"source":{"id":"https://openalex.org/S100695177","display_name":"The Astronomical Journal","issn_l":"0004-6256","issn":["0004-6256","1538-3881"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","dongbi-b","jufo-1","norway-1","oarl","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astronomical Journal","raw_type":"journal-article"},"volume":null,"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5111975141","display_name":"B. R. Pettersen","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I4405285093","display_name":"McDonald Observatory","ror":"https://ror.org/04rwr3y40","country_code":"US","type":"facility","lineage":["https://openalex.org/I4405285093","https://openalex.org/I86519309"]},{"id":"https://openalex.org/I86519309","display_name":"The University of Texas at Austin","ror":"https://ror.org/00hj54h04","country_code":"US","type":"education","lineage":["https://openalex.org/I86519309"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"B. R. Pettersen","raw_affiliation_strings":["McDonald Observatory; Texas, University, Austin, Tex","McDonald Observatory","Texas, University, Austin, Tex"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"McDonald Observatory; Texas, University, Austin, Tex","institution_ids":["https://openalex.org/I4405285093"]},{"raw_affiliation_string":"McDonald Observatory","institution_ids":["https://openalex.org/I4405285093"]},{"raw_affiliation_string":"Texas, University, Austin, Tex","institution_ids":["https://openalex.org/I86519309"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5111975141"],"corresponding_institution_ids":["https://openalex.org/I4405285093","https://openalex.org/I86519309"],"apc_list":{"value":4499,"currency":"USD","value_usd":4499},"apc_paid":null,"fwci":0.6145,"has_fulltext":false,"cited_by_count":38,"citation_normalized_percentile":{"value":0.7347223,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":88,"max":97},"biblio":{"volume":"85","issue":null,"first_page":"871","last_page":"871"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.9984999895095825,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10039","display_name":"Stellar, planetary, and galactic studies","score":0.9984999895095825,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10251","display_name":"Solar and Space Plasma Dynamics","score":0.0003000000142492354,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12917","display_name":"Astronomy and Astrophysical Research","score":0.0003000000142492354,"subfield":{"id":"https://openalex.org/subfields/3105","display_name":"Instrumentation"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/ev-lac","display_name":"EV Lac","score":0.8479999899864197},{"id":"https://openalex.org/keywords/flare-stars","display_name":"flare stars","score":0.9369999766349792},{"id":"https://openalex.org/keywords/star-spots","display_name":"stellar spots","score":0.953000009059906},{"id":"https://openalex.org/keywords/stellar-rotation","display_name":"stellar rotation","score":0.9789999723434448},{"id":"https://openalex.org/keywords/photometric-variability","display_name":"photometric variability","score":0.8109999895095825}],"concepts":[{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.9654473662376404},{"id":"https://openalex.org/C32161561","wikidata":"https://www.wikidata.org/wiki/Q1893536","display_name":"Starspot","level":3,"score":0.9529368877410889},{"id":"https://openalex.org/C164546044","wikidata":"https://www.wikidata.org/wiki/Q285400","display_name":"Flare star","level":5,"score":0.7099510431289673},{"id":"https://openalex.org/C2779588948","wikidata":"https://www.wikidata.org/wiki/Q628261","display_name":"Flare","level":2,"score":0.6798011660575867},{"id":"https://openalex.org/C44870925","wikidata":"https://www.wikidata.org/wiki/Q37547","display_name":"Astrophysics","level":1,"score":0.6507362723350525},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.6198493242263794},{"id":"https://openalex.org/C74050887","wikidata":"https://www.wikidata.org/wiki/Q848368","display_name":"Rotation (mathematics)","level":2,"score":0.6079100370407104},{"id":"https://openalex.org/C2780897414","wikidata":"https://www.wikidata.org/wiki/Q7600592","display_name":"Star (game theory)","level":2,"score":0.5759965777397156},{"id":"https://openalex.org/C88991977","wikidata":"https://www.wikidata.org/wiki/Q6464","display_name":"Stellar rotation","level":3,"score":0.5404058694839478},{"id":"https://openalex.org/C185001636","wikidata":"https://www.wikidata.org/wiki/Q119830","display_name":"Solar flare","level":2,"score":0.4117078483104706},{"id":"https://openalex.org/C130726490","wikidata":"https://www.wikidata.org/wiki/Q675076","display_name":"Light curve","level":2,"score":0.3040517568588257},{"id":"https://openalex.org/C80518518","wikidata":"https://www.wikidata.org/wiki/Q863936","display_name":"K-type main-sequence star","level":4,"score":0.23612505197525024},{"id":"https://openalex.org/C178075534","wikidata":"https://www.wikidata.org/wiki/Q6232","display_name":"T Tauri star","level":3,"score":0.2284896969795227},{"id":"https://openalex.org/C150846664","wikidata":"https://www.wikidata.org/wiki/Q7602306","display_name":"Stars","level":2,"score":0.16770169138908386},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.0},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1086/112750","doi":"https://doi.org/10.1086/112750","is_oa":false,"landing_page_url":"https://doi.org/10.1086/112750","pdf_url":null,"source":{"id":"https://openalex.org/S100695177","display_name":"The Astronomical Journal","issn_l":"0004-6256","issn":["0004-6256","1538-3881"],"is_oa":false,"is_in_doaj":true,"is_core":true,"listed_in":["cwts-core","doaj","dongbi-b","jufo-1","norway-1","oarl","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311669","host_organization_name":"Institute of Physics","host_organization_lineage":["https://openalex.org/P4310311669"],"host_organization_lineage_names":["Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Astronomical Journal","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W4234047655","https://openalex.org/W1533773444","https://openalex.org/W3122102067","https://openalex.org/W1833498581","https://openalex.org/W2992027306","https://openalex.org/W2015389535","https://openalex.org/W2004201045","https://openalex.org/W3021927399","https://openalex.org/W2032483135","https://openalex.org/W3017560255"],"abstract_inverted_index":{"The":[0,11],"magnitude":[1],"variations":[2],"of":[3,7,16],"EV":[4],"Lac":[5],"outside":[6],"flares":[8],"are":[9],"discussed.":[10],"star":[12],"shows":[13],"the":[14,22,26,29,42],"effect":[15],"starspots.":[17],"It":[18,38],"is":[19,32,39],"argued":[20],"that":[21,41],"temperature":[23],"difference":[24],"between":[25],"photosphere":[27],"and":[28],"spot":[30,43],"region":[31],"only":[33],"a":[34],"few":[35],"hundred":[36],"degrees.":[37],"noted":[40],"group":[44],"may":[45],"never":[46],"disappear":[47],"completely":[48],"from":[49],"view.":[50]},"counts_by_year":[{"year":2025,"cited_by_count":2},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":3},{"year":2016,"cited_by_count":3},{"year":2013,"cited_by_count":1}],"updated_date":"2026-10-12T09:40:04.860316","created_date":"2016-06-24T00:00:00"}
