| Name | 069068 |
| Title | The Drop in X-ray Flux at Spectral Type B1:Evidence for a B-Star Dividing Line? |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0690680101 |
| DOI | https://doi.org/10.5270/esa-hoe7fom |
| Author | Dr Wayne Waldron |
| Description | All B star luminosity classes show a substantial drop in their X-ray emission between spectral type B1 and B2 suggesting an H-R diagram B-star dividing line somewhat analogous to the one for K giants. This emission appears to be related to the bi-stability jump at spectral type B1. But our analyses of B supergiant and giant XMM data revealed several interesting and unexpected results that do not support theoretical predictions. There seems to be a fundamental, unknown, underlying process at work in this spectral region. We now wish to extent our study by requesting XMM EPIC observations of 4 B main sequence stars and 1 additional B giant to help us explain the abrupt X-ray changes that are occurring in this intriguing region of the H-R diagram. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2012-07-06T12:24:58Z/2013-03-21T11:21:59Z |
| 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 | 2014-04-03T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2014-04-03T00:00:00Z, 069068, 17.56_20190403_1200. https://doi.org/10.5270/esa-hoe7fom |