The Ca ii infrared triplet’s performance as an activity indicator compared to Ca ii H and K
نویسندگان
چکیده
منابع مشابه
Ca II activity and rotation in F-K evolved stars
Ca II H and K high resolution observations for 60 evolved stars in the field and in 5 open clusters are presented. From these spectra chromospheric fluxes are derived, and a homogeneous sample of more than 100 giants is built adding data from the literature. In addition, for most stars, rotational velocities were derived from CORAVEL observations. By comparing chromospheric emission in the clus...
متن کاملCache as Ca$h Can Cache as Ca$h Can
In this paper we consider the problem of placing proxy caches in a network to get a better performance of the net. We develop a heuristic method to decide in which nodes of the network proxies should be installed and what the sizes of these caches should be. The heuristic attempts to minimize a function of the waiting times in the network.
متن کاملThe signature of chromospheric heating in Ca II H spectra
Context. The heating process that balances the solar chromospheric energy losses has not yet been determined. Conflicting views exist on the source of the energy and the influence of photospheric magnetic fields on chromospheric heating. Aims. We analyze a 1-hour time series of cospatial Ca II H intensity spectra and photospheric polarimetric spectra around 630 nm to derive the signature of the...
متن کاملRegulation of CA II and H+,K(+)-ATPase gene expression in canine gastric parietal cells.
Acid secretagogue-specific receptor activation in parietal cells triggers rapid and coordinate gene expression of gastric H+,K(+)-ATPase and of CA II. The rapid rise in steady-state levels of CA II mRNA is due to new transcription of the CA II gene in stimulated cells. Although the presumed function of CA II in activated parietal cells is to catalyze the generation of HCO3- from OH-, regulation...
متن کاملDust depletion , chemical uniformity and environment of Ca ii H & K quasar absorbers
Ca ii λλ3934, 3969 absorbers, which are likely to be a subset of damped Lyman α systems, are the most dusty quasar absorbers known, with an order of magnitude more extinction in E(B−V) than other absorption systems. There is also evidence that Ca ii absorbers trace galaxies with more ongoing star-formation than the average quasar absorber. Despite this, relatively little is known in detail abou...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201630298