Interferometric observations of R Leonis in the K band - First direct detection of the photospheric pulsation and study of the atmospheric intensity distribution

被引：0

作者：

Perrin, G ^{[1
]}

du Foresto, VC

Ridgway, ST

Mennesson, B

Ruilier, C

Mariotti, JM

Traub, WA

Lacasse, MG

机构：

[1] Observ Paris, DESPA, F-92195 Meudon, France

[2] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTRONOMY & ASTROPHYSICS | 1999年 / 345卷 / 01期

关键词：

techniques : interferometric; stars : fundamental parameters; stars : individual : R Leo; stars : AGE and post-AGB; infrared : stars;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Mira-type star R Leonis was observed at two different epochs in the K band with the FLUOR beam combiner on the IOTA interferometer. A variation of diameter is clearly detected for the very first time at this wavelength revealing an apparent pulsation of atmospheric layers very close to the stellar photosphere. We discuss the excess of visibility measured at high spatial frequencies and show that they very likely reveal smaller diameters of the photosphere (22-24 mas) than those deduced on the basis of shorter frequency components. This smaller diameter makes R Leonis a fundamental pulsator. Mira models are compared to our data and a disagreement with spatial intensity distribution and dynamical behaviour is found.

引用

页码：221 / 232

页数：12

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