Blogs about stars

The runaway stars and their positions (Image NASA, ESA, K. Luhman (Penn State University), and M. Robberto (STScI))

An article published in “The Astrophysical Journal Letters” describes a research about what used to be a multiple system in the Orion Nebula. A team of researchers led by Kevin Luhman of Penn State University used the Hubble Space Telescope to discover a runaway star that was part of the original system with two other stars already known that are also traveling at high speeds. The three stars were part of a single system untile about 540 years ago.

The Cat's Paw Nebula and the protostar NGC 6334I-MM1 (Image ALMA (ESO/NAOJ/NRAO), T. Hunter; C. Brogan, B. Saxton (NRAO/AUI/NSF); GLIMPSE, NASA/JPL-Caltech)

An article published in “Astrophysical Journal Letters” describes the study of a protostar indicated as NGC 6334I-MM1 which increased its brightness 100 times. A team led by astronomer Todd Hunter of the National Radio Astronomy Observatory (NRAO) discovered this transformation by comparing new observations carried out with the ALMA radio telescope with other ones previously carried out with the SMA radio telescope.

Artist's impression of the X9 system with the view from Chandra X-ray Observatory in the inset (Image X-ray: NASA/CXC/University of Alberta/A.Bahramian et al.; Illustration: NASA/CXC/M.Weiss)

An article published in the journal “Monthly Notices of the Royal Astronomical Society” describes a research on what appears to be a binary system including a star with the closest orbit around a black hole. A team of astronomers used NASA’s Chandra X-ray Observatory and NuSTAR space Telescope and the Australia Telescope Compact Array (ATCA) to observe this system called X9 concluding that the star, a white dwarf, takes 28 minutes to orbit the black hole.

A HSC-SSP image of a galaxy cluster (Image NAOJ/HSC Project)

At the end of February the first data from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) were released to the public. It’s a kind of cosmic census created using a large digital camera installed on the Subaru Telescope. The National Astronomical Observatory of Japan (NAOJ) developed a dedicated database and interface to use the wealth of data collected. One hope is to be closer to understand the fate of the universe.

Artistic concept of the galaxy A2744_YD4 (Image ESO/M. Kornmesser)

An article to be published in the journal “The Astrophysical Journal Letters” describes a research about the galaxy A2744_YD4, the most distant observed with the ALMA radio telescope. A team of astronomers led by Nicolas Laporte of University College London also used the X-shooter instrument on ESO’s VLT to confirm that we’re seeing A2744_YD4 as it was about six hundred million years after the Big Bang. The most interesting thing is the dust detection indicating that there were already several supernovae.