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https://medium.com/p/8c0109eefde0: Ask Ethan #95: Could it all come crashing down?
Starts With a Bang!

Direct link Ask Ethan #95: Could it all come crashing down?

2 Jul 2015, 12:28 UTC
tag:blogger.com,1999:blog-1014682403395027648.post-6749738701953274217: Vanishing Behind a Red Dwarf Star
Beyond Earthly Skies

Direct link Vanishing Behind a Red Dwarf Star

1 Jul 2015, 23:00 UTC <span style="font-family: inherit;">Derekas et al. (2015) present the discovery of a totally-eclipsing binary system identified as J0640+3856. This binary system consists of a hot subdwarf O (sdO) star and a red dwarf star. An sdO star is basically a very hot low mass star that is burning helium in its core and a thin envelope of hydrogen surrounds the star’s core. Such a star can be created when a red giant star sheds its outer layers. J0640+3856 has an orbital period of 4.5 hours and the orbital plane of the system is orientated edge-on such that the sdO star disappears entirely behind the red dwarf star every orbit.</span><br /><div style="text-align: center;"><span style="font-family: inherit;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><a href="http://2.bp.blogspot.com/-W7Wodbr7oZ8/VW6e94jIzQI/AAAAAAAAHg4/M7ma_FfqNL8/s1600/Post%2B-%2BJuly%2B2015%2B%25282%2529%2B-%2B1.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="372" src="http://2.bp.blogspot.com/-W7Wodbr7oZ8/VW6e94jIzQI/AAAAAAAAHg4/M7ma_FfqNL8/s640/Post%2B-%2BJuly%2B2015%2B%25282%2529%2B-%2B1.png" width="640" /></a></div><div style="text-align: center;"><span style="font-family: inherit;"><br /></span></div><div class="separator" style="clear: both; text-align: center;"><a href="http://3.bp.blogspot.com/--uWFwD5NUPc/VW6fELq43BI/AAAAAAAAHhA/QaZBui-DOoE/s1600/Post%2B-%2BJuly%2B2015%2B%25282%2529%2B-%2B2.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="336" src="http://3.bp.blogspot.com/--uWFwD5NUPc/VW6fELq43BI/AAAAAAAAHhA/QaZBui-DOoE/s640/Post%2B-%2BJuly%2B2015%2B%25282%2529%2B-%2B2.png" width="640" /></a></div><div style="text-align: center;"><span style="font-family: inherit;">Light curve of J0640+3856. The large dip in relative flux occurs when the more luminous sdO star disappears behind the red dwarf star, while the smaller dip in relative flux occurs when the sdO star passes in front of the less luminous red dwarf star. Derekas et al. ...
http://www.thenightskyguy.com/?p=4675: Best Views of Iconic Summer Triangle
The Night Sky Guy

Direct link Best Views of Iconic Summer Triangle

1 Jul 2015, 22:01 UTC
http://feeds.feedburner.com/EF710D04-3152-469B-B781-FC5BCB353490: Houston, we have a spaceport: FAA gives 'Space City' license for launches
collectSPACE.com: Space History News

Direct link Houston, we have a spaceport: FAA gives 'Space City' license for launches

1 Jul 2015, 20:00 UTC

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