”Is a novel picture required to explain the atmospheric behavior of water in red giant stars?"
نویسنده
چکیده
.................................................................................................................................................. 2 Introduction ............................................................................................................................................. 4 Theory ...................................................................................................................................................... 7 Planck’s law of radiation ..................................................................................................................... 7 Basic stellar spectroscopy ................................................................................................................. 10 Microscopic effects ....................................................................................................................... 11 Macroscopic effects ...................................................................................................................... 12 Transport equation ............................................................................................................................ 13 Eddington-Barbier ............................................................................................................................. 15 Theories of stellar atmospheres ............................................................................................................ 16 Molecular sphere: the MOLsphere model ........................................................................................ 17 Classical model photosphere ............................................................................................................ 19 Discussion .............................................................................................................................................. 28 Conclusions ............................................................................................................................................ 31 References ............................................................................................................................................. 32
منابع مشابه
Pulsating red giant and supergiant stars in the Local Group dwarf galaxy Andromeda I
We have conducted an optical long-term monitoring survey of the majority of dwarf galaxies in the Local Group, with the Isaac Newton Telescope (INT), to identify the long period variable (LPV) stars. LPV stars vary on timescales of months to years, and reach the largest amplitudes of their brightness variations at optical wavelengths, due to the changing temperature. They trace stellar populati...
متن کاملWater Observed in Red Giant and Supergiant Stars - Manifestation of a Novel Picture of the Stellar Atmosphere or else Evidence against the Classical Model Stellar Photosphere
We detected the H2O 6.3 μm bands in more than 30 normal red giants stars from K5III to M8III as well as in some early M supergiants on the SWS spectra retrieved from the ISO Data Archive. This result, however, shows serious inconsistency with the present model photospheres which predict H2O only in the latest M (super)giant stars. Also H2O was once discovered in the early M (super)giant stars n...
متن کاملar X iv : a st ro - p h / 01 09 00 4 v 1 1 S ep 2 00 1 Water in K and M giant stars unveiled by ISO 1 Takashi
Based on the spectra obtained with Infrared Space Observatory, ISO, we detected the 6.3μm bands of water in the late K giant Aldebaran (α Tau) and several early M giant stars (between M0 and M3.5), which have been deemed to be too warm for tri-atomic H2O molecule to reside in their photospheres. The water column densities range (0.2− 2)× 10 molecules cm in our sample of K and M giant stars and ...
متن کاملA Comparative Study of the Visual Elements in Five Miniatures of the Prophet’s Ascension
The epistles of the nocturnal ascent are some versified or prosaic narrations deal with the Ascension orspiritual journey of the Prophet and his observations and levels in this Divine way. According to their cultural traditions and religious beliefs, the Iranian Muslim painters as well as the Persian poets and writers have illustrated this story and prepared several painted manuscripts. Some of...
متن کاملDouble-Star Detection Using Convolutional Neural Network in Atmospheric Turbulence
In this paper, we investigate the usage of machine learning in the detection and recognition of double stars. To do this, numerous images including one star and double stars are simulated. Then, 100 terms of Zernike expansion with random coefficients are considered as aberrations to impose on the aforementioned images. Also, a telescope with a specific aperture is simulated. In this work, two k...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2012