Ep. 497: Update on Globular Clusters

Is it globular clusters or is it globeular clusters? It doesn’t matter, they’re awesome and we’re here to update you on them.

Astronomy Cast will be celebrating their 500th episode the weekend of Sept 15-16, 2018. Want to join us in Edwardsville, Il? Check out our AC500 site here to find out how!

We usually record Astronomy Cast every Friday at 3:00 pm EDT / 12:00 pm PDT / 19:00 UTC. You can watch us live on here on AstronomyCast.com, or the AstronomyCast YouTube page.

If you would like to support Astronomy Cast, please visit our page at Patreon here – https://www.patreon.com/astronomycast. We greatly appreciate your support!

If you would like to join the Weekly Space Hangout Crew, visit their site here and sign up. They’re a great team who can help you join our online discussions!

Download the show [MP3] | Jump to Shownotes | Jump to Transcript

This episode is sponsored by: Casper.

Show Notes

Globular Clusters
Fraser calls them “globe-ular” clusters, and Pamela calls them “glob-ular” clusters. Both are correct.
Where are the Intermediate black holes?
Shapley–Sawyer Concentration Class
Dark globular cluster
Metallicity – the population of heavier elements as metals and to the proportions of these elements.
NGC 2808 contains three distinct generations of stars.
Djorgovski 1’s stars contain hydrogen and helium, but not much else.
Two populations of globular clusters, which became known as Oosterhoff groups:
type I are referred to as “metal-rich” (for example, Terzan 7)
Type 2 have lightly longer period of RR Lyrae variable stars, but are “metal-poor” (for example, ESO 280-SC06)
Exotic classes of stars, such as blue stragglers, millisecond pulsars and low-mass X-ray binaries, are much more common in globular clusters.


Podcast Transcription provided by GMR Transcription
Transcription here

Download the show [MP3] | Jump to Shownotes | Jump to Transcript


No comments yet.

Leave a Reply

Powered by WordPress. Designed by WooThemes