{"title":"中质量恒星的隐藏伴星。XXII.推断三星系 Lambda Muscae 中的天体测量双星中有一颗 0.43M ⊙, 1.65 au 伴星* * 基于智利欧洲南方天文台的观测数据，计划编号 111.24UP.001。","authors":"Idel Waisberg, Ygal Klein, Boaz Katz","doi":"10.3847/2515-5172/ad713a","DOIUrl":null,"url":null,"abstract":"Lambda Muscae is a nearby A-type star reported as a <italic toggle=\"yes\">P</italic> = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16<italic toggle=\"yes\">M</italic>\n<sub>⊙</sub> M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE. Based on a <italic toggle=\"yes\">K</italic> band flux ratio upper limit of 1% from a VLTI/GRAVITY interferometric observation, we estimate a primary mass <italic toggle=\"yes\">M</italic>\n<sub>\n<italic toggle=\"yes\">Aa</italic>\n</sub> = 2.28<italic toggle=\"yes\">M</italic>\n<sub>⊙</sub> and infer that the closer companion is a <italic toggle=\"yes\">M</italic>\n<sub>\n<italic toggle=\"yes\">Ab</italic>\n</sub> = 0.43<italic toggle=\"yes\">M</italic>\n<sub>⊙</sub> star (almost certainly an M dwarf) orbiting at <italic toggle=\"yes\">a</italic> = 1.65 au. The triple system might be dynamically interesting given the low hierarchy and the ratio of angular momenta of the inner and outer orbits of about one.","PeriodicalId":74684,"journal":{"name":"Research notes of the AAS","volume":"299 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43M ⊙, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae* * Based on observations collected at the European Southern Observatory, Chile, Program ID 111.24UP.001.\",\"authors\":\"Idel Waisberg, Ygal Klein, Boaz Katz\",\"doi\":\"10.3847/2515-5172/ad713a\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Lambda Muscae is a nearby A-type star reported as a <italic toggle=\\\"yes\\\">P</italic> = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16<italic toggle=\\\"yes\\\">M</italic>\\n<sub>⊙</sub> M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE. Based on a <italic toggle=\\\"yes\\\">K</italic> band flux ratio upper limit of 1% from a VLTI/GRAVITY interferometric observation, we estimate a primary mass <italic toggle=\\\"yes\\\">M</italic>\\n<sub>\\n<italic toggle=\\\"yes\\\">Aa</italic>\\n</sub> = 2.28<italic toggle=\\\"yes\\\">M</italic>\\n<sub>⊙</sub> and infer that the closer companion is a <italic toggle=\\\"yes\\\">M</italic>\\n<sub>\\n<italic toggle=\\\"yes\\\">Ab</italic>\\n</sub> = 0.43<italic toggle=\\\"yes\\\">M</italic>\\n<sub>⊙</sub> star (almost certainly an M dwarf) orbiting at <italic toggle=\\\"yes\\\">a</italic> = 1.65 au. The triple system might be dynamically interesting given the low hierarchy and the ratio of angular momenta of the inner and outer orbits of about one.\",\"PeriodicalId\":74684,\"journal\":{\"name\":\"Research notes of the AAS\",\"volume\":\"299 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-08-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Research notes of the AAS\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.3847/2515-5172/ad713a\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Research notes of the AAS","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3847/2515-5172/ad713a","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Hidden Companions to Intermediate-mass Stars. XXII. Inferring a 0.43M ⊙, 1.65 au Companion in the Astrometric Binary within the Triple System Lambda Muscae* * Based on observations collected at the European Southern Observatory, Chile, Program ID 111.24UP.001.
Lambda Muscae is a nearby A-type star reported as a P = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16M⊙ M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE. Based on a K band flux ratio upper limit of 1% from a VLTI/GRAVITY interferometric observation, we estimate a primary mass MAa = 2.28M⊙ and infer that the closer companion is a MAb = 0.43M⊙ star (almost certainly an M dwarf) orbiting at a = 1.65 au. The triple system might be dynamically interesting given the low hierarchy and the ratio of angular momenta of the inner and outer orbits of about one.
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