A dataset provided by the European Space Agency

Name: What is NunkiquestionMark
Published: 2014-10-10T00:00:00Z

Proposal ID	072121
Title	What is Nunki?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0721210101
DOI	https://doi.org/10.5270/esa-bh1n101
Principal Investigator, PI	Dr Lidia Oskinova
Abstract	The X-ray emission of near-main sequence B stars is poorly understood, and themechanism that generates it is not yet fully identified. It is known that, ingeneral, the main-sequence B-type stars are relatively weak X-ray sources, withX-ray luminosities being only 10^{-9} as a fraction of their bolometricluminosities. The XMM-Newton slew survey revealed that the B2.5V star sigma Sgr(Nunki) is at least 100 times more X-ray luminous compared to an average star ofthis spectral type. We propose a short 5 ks observation to verify the positionand the flux of the X-ray source coinciding with sigma Sgr. If a high X-ray fluxis confirmed, it will have important consequences for our understanding of fastrotating and magnetic B-type stars.
Publications	The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch, Eric W., \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F The early B-type star Rho Ophiuchi A is an X-ray lighthouse \|Pillitteri, Ignazio, Wolk, Scott J., et al. \| A&A \| 602-92 \| 2017 \| 2017A&A...602A..92P \| http://ui.adsabs.harvard.edu/#abs/2017A&A...602A..92P Analysis of the X-ray emission of OB stars II: B stars \|Ryspaeva, Elizaveta, Kholtygin, Alexander, \| RAA \| 19-120 \| 2019 \| 2019RAA....19..120R \| http://ui.adsabs.harvard.edu/#abs/2019RAA....19..120R 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 The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII, O VIII, and Fe L-shell Transitions \|Pan, Zeyang, Qu, Zhijie, et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P 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	2013-09-22T06:00:13Z/2013-09-22T08:46:53Z
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	2014-10-10T00:00:00Z
Keywords	"average star", "XMM", "xray luminous", "xray luminosities", "xray flux", "type stars", "spectral type", "main sequence", "bolometric luminosities", "XMM-Newton", "xray source coinciding", "xray emission", "fast rotating", "nunki ?.", "sigma sgr"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Lidia Oskinova, 2014, 'What is NunkiquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bh1n101