后来
发表于 2025-3-28 15:43:20
A post-iras interstellar dust model,rstellar medium (HI, H., and HII) in cirrus, reflection nebulae, and HII regions. Taking into account the various constraints on the different dust components, in particular coming from IRAS data, we show that a bimodal rather than continuous size distribution between small and big grains is the most favorable solution.
高射炮
发表于 2025-3-28 22:25:09
Extended infrared emission near stars,of the surrounding regions. The dominant dust heating mechanism appears to be ultraviolet radiation, either from stellar wind shooks or direct stellar radiation from hotter stars. The infrared luminosities from these extended emitting regions are often an appreciable fraction of that of the central star.
Little
发表于 2025-3-29 00:23:43
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解脱
发表于 2025-3-29 06:01:05
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Jingoism
发表于 2025-3-29 07:25:24
Saskia Bruysten,Henning Engelkeh of this survey gave it marked advantages over earlier surveys. The large number of sightings over most of the sky provided excellent sampling of spatial distributions. The instrument and survey parameters were relatively constant throughout, yielding a uniform set of data. This was the first small
Coordinate
发表于 2025-3-29 13:07:29
https://doi.org/10.1007/978-3-531-92819-7t of this ‘zodiacal emission’ has long been of interest for many reasons. The IRAS survey has provided comprehensive brightness measurements in the infrared, covering the celestial sphere with solar elongation angles ranging from 60° to 120°. These data have stimulated numerous approaches to segrega
Chemotherapy
发表于 2025-3-29 17:42:38
https://doi.org/10.1007/978-3-531-92819-7perature and density, and includes an outer edge with the same ellipsoidal shape as the density contours. Results of a preliminary least-squares fits suggest that the outer edge is located near the edge of the asteroid belt, that the grains absorb and radiate like blackbodies, and that the density i
玛瑙
发表于 2025-3-29 21:03:33
Christian Seelos,Kate Ganly,Johanna Mairsults about temperature T, global volume intensity ℜ, albedo of the dust ., and their gradients with heliocentric distance r (in AU) are derived in the ecliptic from the available IRAS observations. Typically T is found to be of the order of 250 r. K and . of the order of 0.09 r..
insurgent
发表于 2025-3-30 02:48:54
Christian Seelos,Kate Ganly,Johanna Maire is H.O; CO and CO. are also present in minor abundances. The IR spectrum of P/Halley has also revealed for the first time a 3 µm signature showing some analogy with the unidentified IR interstellar features. The cometary signature is interpreted by the presence of hydrocarbons, both in the saturat
Optometrist
发表于 2025-3-30 05:31:48
Anne Clifford,Sarah E. A. Dixond based telescopes observations carried out by both amature and professional astronomers. In this overview we will discuss only the part of the data set that is of most interest ot infrared astromers, namely the nucleus and the dust. The molecular emission has been dealt with in another chapter.