English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using the ACS on HST, we have surveyed the FUV and NUV populations in thecore region of M80. The CMD reveals large numbers of blue and extremehorizontal branch stars and blue stragglers, as well as approx. 60 objectslying in the region of the CMD where accreting and detached white dwarfbinaries are expected. Overall, the blue straggler stars are the most centrallyconcentrated population, with their radial distribution suggesting a typicalblue straggler mass of about 1.2 Msun. However, counterintuitively, the faintblue stragglers are significantly more centrally concentrated than the brightones and a Kolmogorov-Smirnov test suggest only a 3.5% probability that bothfaint and bright blue stragglers are drawn from the same distribution. This maysuggest that (some) blue stragglers get a kick during their formation. We havealso been able to identify the majority of the known X-ray sources in the corewith FUV bright stars. One of these FUV sources is a likely dwarf nova that wasin eruption at the time of the FUV observations. This object is located at aposition consistent with Nova 1860 AD, or T Scorpii. Based on its position,X-ray and UV characteristics, this system is almost certainly the source of thenova explosion. The radial distribution of the X-ray sources and of thecataclysmic variable candidates in our sample suggest masses > 1 Msun.

A Far-UV Survey of M 80: X-ray Source Counterparts, Strange Blue Stragglers and the Recovery of Nova T Sco