Observations

Mar 20, 2019

Characterising high-frequency pulsating A-type stars found with SuperWASP

2018-2-SCI-017

Observations of hot of variable stars to determine their fundament properties through spectroscopy.

The Lithium Abundance of the Large Magellanic Cloud

2018-2-SCI-006

The creation of the first chemical elements, which took place just minutes after the Big Bang, provides an intimate view of the physical laws that governed our Universe during its first moments. At present, the Standard Model of cosmology and particle physics is unable to fully explain the relative abundance of these primordial elements. In particular, there is a significant disagreement between the measured and predicted abundance of lithium. We propose to conduct a novel survey that will provide a new, reliable measure of the lithium abundance of gas clouds in a nearby galaxy.

Monitoring the line emission in Southern Galactic Be/X-ray binaries

2017-1-MLT-004

Lines arising from the disc of material around Be/X-ray binaries are highly variable on multiple timescales. The variability seen is intimately linked to the mass transfer and resulting X-ray emission seen in such systems, though the details of this link are still not well understood. We are monitoring these lines with SALT/RSS to see how they change during periods of differing X-ray activity and at different points around their orbits.

SALT HRS radial velocity monitoring of post-AGB binary stars

2018-2-MLT-007

We are searching for binary stars in some of the most beautiful stellar remnants in the Galaxy.

Asymmetry is Destiny: Wolf-Rayet Binary Stars as GRB Progenitors

2018-2-MLT-005

This program aims to use the recently-commissioned high-precision spectropolarimetry mode of RSS to probe the prodigious mass-loss from certain massive evolved stars known as Wolf-Rayet stars which are in binary systems. These objects are possible progenitors of Gamma-Ray Bursts, which are the most energetic explosions yet known, and can be seen across the entire known universe.

Spectroscopic investigations of Cepheids and stars belonging to Galactic open clusters and associations

2018-2-MLT-004

Spectroscopic investigations of Cepheids and stars belonging to Galactic open clusters and associations

HRS HS-mode commissioning

2018-2-COM-001

Getting the HRS tuned up for exoplanet science

Valentine Star heart-beating again

2018-2-DDT-003

Mar 18, 2019

HRS spectroscopy to unveil the parameters of giants in yellow symbiotic systems

2018-2-SCI-021

We propose to obtain high resolution (R~40000) high S/N (~>50) spectra for 20 of so called yellow symbiotic systems using HRS spectrograph in MR mode. The aim of the proposal is to use the red arm HRS spectra to measure abundances of chemical elements using the spectral synthesis. We will employ the method of standard LTE analysis with use of a hydrostatic model atmospheres. We will also look for possible abundance anomalies due to, e.g., former mass transfer pollution. We will use new information about orbital parameters and Gaia DR2 distances to revise and put new constraints on the physical parameters (temperature, luminosity, abundances) of these giants. It seems be very likely that these objects may turn out to have significantly larger diameters, and so be located at longer distances, be significantly colder and more luminous – the bright giants rather than a normal giants.

Asymmetry is Destiny: Wolf-Rayet Binary Stars as GRB Progenitors

2018-2-MLT-005

This program aims to use the recently-commissioned high-precision spectropolarimetry mode of RSS to probe the prodigious mass-loss from certain massive evolved stars known as Wolf-Rayet stars which are in binary systems. These objects are possible progenitors of Gamma-Ray Bursts, which are the most energetic explosions yet known, and can be seen across the entire known universe.