A dataset provided by the European Space Agency

Name 055100
Title A search for a spinning white dwarf companion in Gamma-Cas-analogs


DOI https://doi.org/10.5270/esa-k0029hp
Author Dr Christian Motch
Description The origin of the hard X-ray spectrum emitted by Gamma-Cas remains a puzzle. Both a white dwarf accreting from the Be star circumstellar disc or magnetic interaction between the photosphere and the disc can explain the unusually hard X-ray emission. The recent discovery of several new G-Cas analogs offers new opportunities to address this problem. XMM-Newton observations of two G-Cas analogs, HD161103 and HD119682 revealed evidences of periodic modulations of the X-ray flux apparently stronger than in G-Cas itself. We propose to re-observe these two sources in order to confirm or not the stability of the period. Establishing the presence of a stable pulsation in any of these G-Cas analogs would be a major step forward in our understanding of the whole class.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2009-03-06T10:55:31Z/2009-03-07T02:50:01Z
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 2010-03-26T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2010-03-26T00:00:00Z, 055100, 17.56_20190403_1200. https://doi.org/10.5270/esa-k0029hp