THE INFRARED ANGULAR DIAMETER OF OMICRON CETI NEAR MAXIMUM LIGHT

被引：23

作者：

RIDGWAY, ST ^{[1
]}

BENSON, JA ^{[1
]}

DYCK, HM ^{[1
]}

TOWNSLEY, LK ^{[1
]}

HERMANN, RA ^{[1
]}

机构：

[1] UNIV WYOMING,DEPT PHYS & ASTRON,LARAMIE,WY 82071

来源：

ASTRONOMICAL JOURNAL | 1992年 / 104卷 / 06期

关键词：

D O I：

10.1086/116397

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present infrared angular diameter measurements of omicron Ceti, the prototype Mira star. The measurements were obtained near maximum light (Sept. 1990) with IRMA (the Infrared Michelson Array), a near-infrared, broad-band, two telescope interferometer. Here we report visibilities obtained with telescope separations of 8.0 and 12.0 m. The data were fit with both uniform disk and limb darkened models. For the time of our observations, we find that the uniform disk angular diameter of omicron Cet at 2.2 mum is 36.1 +/- 1.4 milliarcsec. By using the limb darkening models of Scholz & Takeda [A&A, 186, 200 ( 1987)] and our angular diameter measurement, we have derived a stellar physical angular diameter of 43.3 +/- 1.7 milliarcsec. From this angular diameter and contemporaneous photometry we have further determined the effective temperature of omicron Cet during our observations to be 2270 +/- 140 K. This value agrees well with the infrared color temperature for Mira, but is considerably lower than T(eff) indicated by molecular excitation temperatures.

引用

页码：2224 / 2228

页数：5

共 26 条

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