News on Stars
- Discovery of 'Ultra-cool' dwarf-star
- Oslo-experiment may explain massive star explosions
- The globular cluster M55
- Type 1a supernova have 2 sources
- Star surrounded by rare disk of quarts dust
- Aging star erupting with dust, as it prepartes for
- An old star with some new tricks
- The origin of brown dwarf substellar objects
- Black hole outburst i the M83 galaxy
- Star torn apart by black hole identified
- The last gasps of ligth from a dying star
- A star-cluster within another cluster
- Astronomers detect coolest dwarf-star
- The lives of supergiants stars
- Discovery of 2 nearby white dwarf stars
- Comet massacre around nearby star
- Black Holes grow, by eating stars
- Stars explode inside-out
- Watch a star explode
- New theory on size of black holes
- Origin of Class 1a supernovae narrowed down
- Panets figth over popular orbits
- Best-ever image of globular star-cluster
- Sister-stars drifting apart
- Rare peek at early stage of star formation
|
Fake-diamond star
Friday, 10 December 2010 11:46
|
|
| Astronomy - Stars |
|
An irish team of astronomers has found a star that is embedet in Zirkonium. A crystal most commonly used to produce fake-diamonds! The star LS IV-14 116 is a relatively intermediate He-sdB star, also known to be a photometric variable. Analysis of the spectrum shows LS IV-14 116 to have a temperature of 34000K and surface helium abundanc. This places the star slightly above the standard extended horizontal branch, as represented by normal sdB stars. The magnesium and silicon abundances indicate the star to be metal poor relative to the Sun. But a number of significant but unfamiliar absorption lines were identified as being due to germanium, strontium, yttrium and zirconium. After calculating oscillator strengths (for Ge, Y and Zr), the photospheric abundances of these elements were established to range from 3-4x above solar standards. The most likely explanation is that these overabundances are caused by radiatively-driven diffusion forming a chemical cloud layer in the photosphere. It is conjectured that this cloud formation could be mediated by a strong magnetic field. Futhermore; At a distance of 4000light-years it is significantly brigther than a normal sub-dwarf star, as its light sparkles in the fake diamond! High-resolution blue-optical spectroscopy was obtained with the Anglo-Australian Telescope. Source: arXiv |




