|Title||Cepheids: Unraveling Mass Loss and Luminosity|
|Author||Dr Nancy Remage Evans|
|Description||The Cepheid Leavitt law (P-L relation) continues to be a cornerstone of cosmology. However, the favored implementation in the infrared requires an understanding of CircumStellar Envelopes (CSEs) seen around many Cepheids. CSEs may also hold the key to possible pulsation driven mass-loss, an important component evolutionary modeling. Recently discovered X-ray bursts modulated by the pulsation cycle provide a possible link to CSEs. The observations requested here will test the link between X-rays and CSEs (Eta Aql), and also the connection to the ..atmosphere collapse" X-ray trigger (Zeta Gem).|
|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, 2020-06-05T22:00:00Z, 084051, 17.56_20190403_1200. https://doi.org/10.5270/esa-3r6f7ic|