A dataset provided by the European Space Agency

Name 072354
Title The Secret Lives of Cepheids: Exploring the X-ray Variability of delta Cep
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0723540301
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0723540401

DOI 10.5270/esa-amro4ri
Author Prof Edward Guinan
Description We propose XMM-NEWTON EPIC observations of the prototype of Classical Cepheids, δ Cep, that we discovered is a variable X-ray and FUV emission-line star. The data will complement existing - approved HST FUV spectroscopy and complete X-ray phase coverage for this important star, which shows well-defined phased changes of FUV emission line fluxes from hot (10,000 300,000 K) plasmas. The emissions peak between pulsation phases 0.75 1.05 and likely originate from pulsation-induced shocks. We request two 90 ksec exposures of δ Cep, covering the critical phase range of ~0.5 1.0, where X-ray emissions should peak. These phases were not previously covered by XMM. The requested observations will provide crucial tests of atmospheric heating theories for Cepheids.
Publication Discovery of the Hard Spectrum VHE gamma-Ray Source HESS J1641-463 . Abramowski, A., Aharonian, F., et all. . ApJ . 794-1 . 2014 . 2014ApJ...794L...1A ,
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 ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2013-06-28T06:11:55Z/2013-07-03T08:00:22Z
Version 17.56_20190403_1200
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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2014-09-01T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2014-09-01T00:00:00Z, 072354, 17.56_20190403_1200. https://doi.org/10.5270/esa-amro4ri