A dataset provided by the European Space Agency

Name: Joint XMM-Newton and HST study of the magnetic weak-wind O-star HD 54879
Published: 2017-05-18T22:00:00Z

Proposal ID	078018
Title	Joint XMM-Newton and HST study of the magnetic weak-wind O-star HD 54879
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0780180101
DOI	https://doi.org/10.5270/esa-kxf6te9
Principal Investigator, PI	Prof Wolf-Rainer Hamann
Abstract	Current massive-star astrophysics struggles with a number of urgent questions:what are the true mass-loss rates, what is the role of magnetic fields, how areX-rays produced? HD54879 provides an important laboratory to study thesequestions. While a strong magnetic field (2.1,kG) has been recently detected inthis star, it otherwise exhibits a normal spectrum of O9.7 main sequence type.We propose joint XMM and HST observations of HD54879. Analysis of the UVspectrum will establish the parameters of the cool stellar wind, while from theXMM data the hot plasma component will be studied. The new observations willestablish a gauge for stellar wind theory and provide a template X-ray spectrumfor magnetic massive stars with weak wind.
Publications	A combined HST and XMM-Newton campaign for the magnetic O9.7 V star HD 54879. Constraining the weak-wind problem of massive stars \|Shenar, T., Oskinova, L. M., et al. \| A&A \| 606-91 \| 2017 \| 2017A&A...606A..91S \| http://ui.adsabs.harvard.edu/#abs/2017A&A...606A..91S A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879 \|Hubrig, S., K\\u00fcker, M., et al. \| MNRAS \| 484-4495 \| 2019 \| 2019MNRAS.484.4495H \| http://ui.adsabs.harvard.edu/#abs/2019MNRAS.484.4495H Classification of 4XMM-DR9 sources by machine learning \|Zhang, Yanxia, Zhao, Yongheng, \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez, Antonio C., \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Robust constraints on feebly interacting particles using XMM-Newton \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque, Pedro, Balaji, Shyam, \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2016-05-01T04:53:57Z/2016-05-01T16:02:17Z
Version	17.56_20190403_1200
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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	2017-05-18T22:00:00Z
Keywords	"magnetic field", "main sequence type", "magnetic weak wind", "magnetic fields", "XMM-Newton", "xmm newton", "template xray spectrum", "mass loss rates", "XMM", "cool stellar wind", "HST", "xmm data", "uv spectrum", "stellar wind theory", "weak wind", "star hd 54879", "hot plasma component", "magnetic massive stars", "normal spectrum"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Wolf-Rainer Hamann, 2017, 'Joint XMM-Newton and HST study of the magnetic weak-wind O-star HD 54879', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-kxf6te9