Observations

Jun 16, 2019

2018-2 OU-SALT: Establishing a homogeneous database for activity of close-in planet hosts

2018-2-MLT-003

We are observing stars with planets orbiting very close to them. These planets complete an orbit around their star in about a day. This means the planets are heated and pulled by the star’s gravity and magnetic field. We are looking at the signatures of that in emission from calcium in the outer layers of the star’s atmosphere.

TESSting the interior structures of supernova progenitors

2019-1-SCI-036

Just as we know the interior structure of the Earth from the analysis of earthquakes, astronomers use stellar oscillations – “starquakes” to sound the inner life of the stars. Very precise measurements, such as from the upcoming NASA mission TESS, are required for this effort. The present project uses stellar spectral from SALT to characterize some targets for TESS, stars which are highly interesting because they are tomorrow’s supernovae.

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.

HRS HS-mode commissioning

2019-1-COM-002

Getting the HRS tuned up for exoplanet science

Spectroscopic observations of central stars of mid-infrared nebulae discovered w ith Spitzer and WISE

2019-1-MLT-002

Spectroscopic observations of central stars of mid-infrared nebulae discovered w ith Spitzer and WISE

Jun 15, 2019

Surface Chemistry of Peculiar Hot Subdwarfs

2019-1-MLT-003

Stars approaching the end of their lives expand and, in many cases, exchange material with close companions. This has a radical effect on their evolution and surface composition, producing a zoo of rare but highly exotic stars. By exploring the propertiesof thes pathological cases, we are endeavouring to understand the ways in which stars exhange matter and evolve towardstheir final fate as white dwarfs or supernovae. The stars in this programme are perfect examples — many of them have completelylost their surface hydrogen, for reasons still to be explained. These observations will tell us about the abundances of otherelements — previously we have discovered huge overabundances of exotic species such as lead and zirconium, and will explore how some of these stars may vary over time.

TESSting the interior structures of supernova progenitors

2019-1-SCI-036

Just as we know the interior structure of the Earth from the analysis of earthquakes, astronomers use stellar oscillations – “starquakes” to sound the inner life of the stars. Very precise measurements, such as from the upcoming NASA mission TESS, are required for this effort. The present project uses stellar spectral from SALT to characterize some targets for TESS, stars which are highly interesting because they are tomorrow’s supernovae.

SALT Spectroscopy of Gaia Hypervelocity Stars

2019-1-SCI-020

Following fast-moving stars found by Gaia. @_sublunar_ @kenjshen

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.

HRS HS-mode commissioning

2019-1-COM-002

Getting the HRS tuned up for exoplanet science