|Title||The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray Variables?|
|Author||Prof Edward Guinan|
|Description||We are now immersed in the middle of a stellar mystery: why (and how) are Classical Cepheids producing X-rays? We propose phase-constrained & better exposed XMM observations in Cycle 9 to solve this mystery, and initiate a leap forward in our understanding of Cepheid atmospheres, pulsations, winds, shocks and internal structures. It is worth noting that: all three Cepheids observed to date by XMM have successfully been detected and, more importantly, our recent XMM results mark the first ever unambiguous X-ray detections of Cepheids. The major aim of this proposal is to obtain deeper XMM observations of two previously observed Cepheids (Polaris & beta Dor) at critical pulsation phases to understand the mechanism(s) by which they produce X-rays.|
|Publication||The Secret Lives of Cepheids: A Multi-Wavelength Study of the Atmospheres and Real-Time Evolution of Classical Cepheids . Engle, Scott, . PhDT . 0-45 . 2015 . 2015PhDT........45E ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
The Secret Lives of Cepheids: delta Cep---The Prototype of a New Class of Pulsating X-Ray Variable Stars . Engle, Scott G., Guinan, Edward F., et all. . ApJ . 838-67 . 2017 . 2017ApJ...838...67E ,
X-Ray, UV and Optical Observations of Classical Cepheids: New Insights into Cepheid Evolution, and the Heating and Dynamics of Their Atmospheres . Engle, Scott G., Guinan, Edward F., . JASS . 29-181 . 2012 . 2012JASS...29..181E ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2011-05-21T00:00:00Z, 065478, 17.56_20190403_1200. https://doi.org/10.5270/esa-l5aakro|