Star Light, Star Bright, First Molecule I See Tonight
نویسندگان
چکیده
منابع مشابه
First Star Clusters
Observations of the Lyα forest at z ∼ 3 reveal a metallicity Z ∼ 10 −2 Z ⊙. The high-redshift supernovae that polluted the IGM also accelerated relativistic electrons. Since the energy density of the CMB ∝ (1 + z) 4 , at high redshift these electrons cool via inverse Compton scattering. Thus, the first star clusters emit X-rays. Unlike stellar UV ionizing photons, these X-rays can escape easily...
متن کاملCan a Shore Crab See a Star ?
1. The absolute-intensity threshold of the optokinetic response in the crab Leptograpsus variegatus was measured using a moving continuous monochromatic point source. The results are compared to the photoreceptor responses of the same animal (Doujak, 1984), to determine the photoreceptor signal for the same behavioural threshold stimuli. 2. Optokinetic eye movements demonstrate that at the peak...
متن کاملWetting of a multiarm star-shaped molecule.
The equilibrium contact angles and line tensions of macroscopic droplets, composed of star-shaped polystyrene (PS) macromolecules, on silicon oxide substrates, are shown to be smaller than their linear analogs, by up to approximately 1 and 2 orders of magnitude, respectively, depending on the size and functionality of the star-shaped molecule. A precursor layer, of lateral dimensions and of thi...
متن کاملThe Uv Bright Star Zng 1 in M 5
We report the results of Hα imaging and UV spectroscopy with the Hubble Space Telescope of the hot post-AGB star ZNG 1 in M 5 and its suspected planetary nebula. Post asymptotic giant branch (PAGB) stars of population II are rare objects but are Rosetta stones for testing the theory of stellar evolution. Bona fide members of this class are the rare nuclei of halo planetary nebulae (PN) and PAGB...
متن کاملPG 1618 + 563 B : A new bright pulsating sdB star ?
The results of two runs of time-series photometry made at the Nordic Optical Telescope clearly show that the sdB star PG 1618+563B is a new member of the EC 14026 class of sdB pulsators. Its power spectrum shows a doublet of frequencies at about 6.95 and 7.18 mHz (P ∼ 144 and 139 s respectively), which produce a modulation effect in the light curve with a beat period of about 1.2 hours. The amp...
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: Biophysical Journal
سال: 2014
ISSN: 0006-3495
DOI: 10.1016/j.bpj.2014.01.009