Name | 074002 |
Title | Probing the extremes of the Lx-Lbol relation of O-stars |
URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0740020101 |
DOI | https://doi.org/10.5270/esa-1i69jji |
Author | Prof Gregor Rauw |
Description | We propose to probe the Lx/Lbol relation of O-type stars in the young open cluster IC 1805. This cluster hosts a very rare and extreme O4If^+ star (HD 15570), i.e. a transition object between normal O-stars and evolved Wolf-Rayet stars. Theoretical models predict that such transition stars should have a weaker X-ray emission than less extreme O-star, with a log(Lx/Lbol) intermediate between the -7 value of O-stars and the much lower value obtained for Wolf-Rayet stars. IC 1805 offers the unique opportunity to test this scenario on a homogeneous population of O-stars (same distance, same age, same metallicity,.). |
Publication | No observations found associated with the current proposal |
Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2014-08-25T20:50:00Z/2014-08-26T10:43:20Z |
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 | 2015-09-19T22:00:00Z |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Prof Gregor Rauw, 2015, 074002, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1i69jji |