| Name | 002214 |
| Title | The X-ray Halo and Spectrum of the Unusual O Star HD148937 |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0022140101 |
| DOI | https://doi.org/10.5270/esa-bx9u9g9 |
| Author | European Space Agency |
| Description | We propose to observe the O star HD148937 for 30 ksec to measure both the X-ray halo formed by dust scattering, as well as the spectrum of the star itself. The X-ray halo measures the size and composition of large dust grains, which have most of the mass that is in dust, but are difficult to observe at other wave- lengths. HD148937, unlike most halo sources, has emission lines, and we can use these to image the halo in narrow energy bands. The spectrum of HD148937 will be measured by the XMM RGS with over 6000 counts, enough to detect absorption and doppler shifts of strong lines. HD148937 is an unusual O star, 20 times brighter than the average O star with a harder spectrum. This will test current models of O star winds, which have difficulty creating even the average luminosity. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2001-02-25T10:29:18Z/2001-02-25T22:07:08Z |
| 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 | 2002-06-10T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2002, The X-Ray Halo And Spectrum Of The Unusual O Star Hd148937, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bx9u9g9 |