| Name | 065079 |
| Title | X-Ray Spectroscopy of the Hyades Binary 71 Tau |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0650790101 |
| DOI | https://doi.org/10.5270/esa-0bno89k |
| Author | Dr Theodore Simon |
| Description | 71 Tau is an enigmatic object for two reasons: (i) it is the second brightest X-ray source in the Hyades, yet early-F stars as a rule are not strong coronal emitters; (ii) it lies 1 mag above the cluster main sequence, implying it is 150 Myr older than other cluster members. Recent HST observations have discovered a faint stellar companion directly south of the primary that is seen only in its UV emission lines. The high emission levels of this object are most readily explained if it is a tight binary of coronally active dG stars. We propose to observe the O VII and O VIII lines near 20 A using the XMM RGS. The ratio of these line strengths will be used to determine whether the UV secondary can account for the striking X-ray properties of 71 Tau. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2010-08-17T01:16:50Z/2010-08-17T12:56:56Z |
| 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 | 2011-09-04T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Theodore Simon, 2011, 065079, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-0bno89k |