|Title||The Secret Lives of Cepheids: Exploring Cepheid X-ray Activity and Variability|
|Author||Dr Edward Guinan|
|Description||We propose an XMM observation of the prototype of Classical Cepheids delta Cep to confirm X-ray variability. The data will complement our existing XMM data and HST FUV spectroscopy for this important star with well-defined, phased variability from 10,000 300,000 K plasmas, originating from pulsation-induced shocks. We request one 65-ksec exposure of delta Cep to confirm enhanced X-ray activity around 0.5p, observed in our previous XMM data. If confirmed, the phasing of the X-ray activity will stand in stark contrast to that of the FUV emissions, and provide important information on the atmospheric heating mechanism(s) of this Cepheid. We also propose a 40-ksec observation of the Cepheid zeta Gem to search for X-ray activity and expand the current Cepheid X-ray Inventory.|
|Publication||No observations found associated with the current proposal|
|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, 2016-04-14T22:00:00Z, 074351, 17.56_20190403_1200. https://doi.org/10.5270/esa-3izb1tp|