منابع مشابه
On determining the mass - loss rates of red giants and red supergiants based on infrared data
I review existing methods for determining mass-loss rates of red giants and red supergiants based on infrared data. The simplest method is based on models for the absorption and emission by dust which forms in the dense outflows from these cool stars. I discuss the parameters and assumptions upon which the method relies, review relationships between the mass-loss rate and infrared colours or fa...
متن کاملRadii and Effective Temperatures for K and M Giants and Supergiants. Ii
We present new interferometric observations for 74 luminous red stars, made in the near-infrared. We show that our 2.2 km uniform-disk diameters agree with other near-infrared diameter determinations (lunar occultations and interferometers) for 22 stars measured in common with ours. From our new data, we derive e†ective temperatures that are compared with our previous work and with comparable o...
متن کاملRadii and Effective Temperatures for G, K, and M Giants and Supergiants
Interferometrically determined angular diameters obtained at the Palomar Testbed Interferometer (PTI) for 69 giant and supergiant stars are presented. Spectral types of the 59 giant stars generally lie between G6 and M6, although a B7 giant is included ; the nine bright giants and supergiants have spectral types between F5 and M5. Comparison of the results to those from the IR Optical Telescope...
متن کاملAn improved calibration of Cepheid visual and infrared surface brightness relations from accurate angular diameter measurements of cool giants and supergiants
We have calibrated optical and near-infrared surface brightness – colour relations for cool giant and supergiant stars usinghigh-precision angular diameters of these stars determined from Michelson interferometry. We find that the giant and supergiant relations are undistinguishable over a wide range of intrinsic colours. We independently determine the slopes of these relations obeyed byCepheid...
متن کاملInfrared imaging: Synchrotrons vs. arrays, resolution vs. speed
At the ALS we have been testing out Thermo-Electron’s newest infrared imaging system, the Continuum XL microscope. This microscope is equiped with a 32-element MCT (16 · 2) array which allows rapid infrared imaging with fixed step sizes. The microscope also has a conventional single element MCT-A, which can be swapped for an MCT-B, or InSb detectors. This microscope is installed on ALS Beamline...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1998
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1998396