|Low-Mass Companions of Cepheids: Fingerprints of Star Formation
|Dr Nancy Remage Evans
|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
|No observations found associated with the current proposal
|EMOS1, EMOS2, EPN, OM, RGS1, RGS2
|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.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2015, 072030, PPS_NOT_AVAILABLE. https://doi.org/10.5270/esa-kbghuvt