Stellar radii from long-baseline interferometry

摘要：

Long baseline interferometers now measure the angular diameters of nearby stars with sub-percent accuracy. They can be translated in photospheric radii when the parallax is known,thus creating a novel and powerful constraint for stellar models. I present applications of interferometric radius measurements to the modeling of main sequence stars. Over the last few years,we obtained accurate measurements of the linear radius of many of the nearest stars: Procyon A,61Cyg A & B,αCen A & B,Sirius A,Proxima... Firstly,I describe the example of our modeling of Procyon A (F5IV-V) with the CESAM code,constrained using spectrophotometry,the linear radius,and asteroseismic frequencies. I also present our recent results on the low-mass 61 Cyg system (K5V+K7V),for which asteroseismic frequencies have not been detected yet.

关键词： techniques:interferometric stars:individual (Procyon, 61 Cyg) stars:evolution

作者: Pierre Kervella

作者单位: LESIA,Observatoire de Paris,CNRSUMR8109,UPMC,Université Paris Diderot,5 Place Jules Janssen,92195 Meudon,France

会议类型: 国际会议

会议名称: The 252th Symposium of the International Astronomical Union(国际天文学联合会第252届研讨会)

会议地点: 海南三亚

会议语种:英文

页码: 405-412

在线出版日期: 2008-04-06（万方平台首次上网日期，不代表论文的发表时间）