A dataset provided by the European Space Agency

Name 072121
Title What is Nunki?
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0721210101

DOI 10.5270/esa-bh1n101
Author Dr Lidia Oskinova
Description The X-ray emission of near-main sequence B stars is poorly understood, and the mechanism that generates it is not yet fully identified. It is known that, in general, the main-sequence B-type stars are relatively weak X-ray sources, with X-ray luminosities being only 10^{-9} as a fraction of their bolometric luminosities. 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 of this spectral type. We propose a short 5 ks observation to verify the position and the flux of the X-ray source coinciding with sigma Sgr. If a high X-ray flux is confirmed, it will have important consequences for our understanding of fast rotating and magnetic B-type stars.
Publication The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
The early B-type star Rho Ophiuchi A is an X-ray lighthouse . Pillitteri, Ignazio, Wolk, Scott J., et all. . A&A . 602-92 . 2017 . 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 ,
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 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 2014-10-10T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2014-10-10T00:00:00Z, 072121, 17.56_20190403_1200. https://doi.org/10.5270/esa-bh1n101