Using data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and ESA's Gaia satellite, astronomers have detected 21 new high-probability extremely low-mass white dwarfs. The finding is reported in a paper published July 27 on the arXiv pre-print server.
Extremely low-mass white dwarfs are rare objects, found with only few exceptions in short-period binaries. In ELM WD binaries, one of the stars has a mass lower than 0.3. It is assumed that such a low mass cannot be a result of canonical single-star evolution; therefore, these systems are thought to undergo significant mass loss during their evolution.
To date, only about 100 ELM WDs are known, so finding new ones and studying them in detail could be essential to advance knowledge of stellar evolution. Some systems of this type are also predicted to emitled by Kun Wang of China West Normal University in Nanchong, China, reports the discovery of 21 new ELM WDs by investigating more than 100 known candidate objects of this type.
"Based on the LAMOST DR8 spectral database, we analyzed 136 ELM WD candidates selected from Gaia DR2 data and 12 known objects previously identified by the ELM Survey," the researchers wrote in the paper. All in all, Wang's team inspected a total of 188 LAMOST low-resolution spectra, 172 of which belong to 136 ELM WD candidates and 16 of which come from 12 previously known samples. They obtained atmospheric parameters and
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