| Name | 072030 |
| Title | Low-Mass Companions of Cepheids: Fingerprints of Star Formation |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0720300101 |
| DOI | https://doi.org/10.5270/esa-kbghuvt |
| Author | European Space Agency |
| Description | Star-formation theory should be able to reproduce the binary characteristics (separation, mass ratio, eccentricity) for high- and intermediate-mass stars; but first we have to define, through observations, what those characteristics are. This project proposes XMM X-ray observations of a sample of 8 possible companions of 5 Msun Cepheids to confirm that they are young physical companions, not chance alignments with field stars. The sample is a subset of 69 Cepheids surveyed with the Hubble Space Telescope Wide Field Camera 3 (WFC3), identifying 35 possible low-mass companions. They have the surprising characteristic that there are more F-G dwarfs (compared to K dwarfs) than predicted by the Initial Mass Function, a ..fingerprint of binary star formation |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2013-08-20T21:52:30Z/2014-01-27T01:00:47Z |
| Version | PPS_NOT_AVAILABLE |
| 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 | 2015-02-10T23:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2015, Low-Mass Companions Of Cepheids: Fingerprints Of Star Formation, PPS_NOT_AVAILABLE, European Space Agency, https://doi.org/10.5270/esa-kbghuvt |