A dataset provided by the European Space Agency

Name: The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line
Published: 2012-03-15T00:00:00Z

Proposal ID	065261
Title	The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0652610101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0652610201
DOI	https://doi.org/10.5270/esa-8w2d70y
Principal Investigator, PI	Dr Wayne Waldron
Abstract	All B star luminosity classes show a substantial drop in their X-ray emissionbetween spectral type B1 and B2 suggesting an H-R diagram B-star dividing linesomewhat analogous to the one for K giants. This emission appears to be relatedto the bi-stability jump at spectral type B1. But our analyses of B supergiantand giant XMM data revealed several interesting and unexpected results that donot support theoretical predictions. There seems to be a fundamental, unknown,underlying process at work in this spectral region. We now wish to extent ourstudy by requesting XMM EPIC observations of 4 B main sequence stars and 2additional B giants to help us explain the abrupt X-ray changes that areoccurring in this intriguing region of the H-R diagram.
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 Exploring the end states of massive stars using the X-ray emission of neutron stars and supernova remnants \|Prinz, Tobias, \| PhDT \| 0-305 \| 2013 \| 2013PhDT.......305P \| http://ui.adsabs.harvard.edu/#abs/2013PhDT.......305P 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 Toward an X-ray inventory of nearby neutron stars \|Vahdat, A., Posselt, B., et al. \| A&A \| 658-95 \| 2022 \| 2022A&A...658A..95V \| http://ui.adsabs.harvard.edu/#abs/2022A&A...658A..95V 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	2011-01-31T21:47:00Z/2011-02-27T01:20:32Z
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	2012-03-15T00:00:00Z
Keywords	"XMM", "EPIC", "giant xmm data", "spectral type b1", "intriguing region", "xray flux", "emission appears", "spectral region", "star luminosity classes", "substantial drop", "bi stability jump", "requesting xmm epic", "xray emission", "star dividing line", "abrupt xray", "main sequence stars"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Wayne Waldron, 2012, 'The Drop in X-ray Flux at Spectral Type B1: Evidence for a B-Star Dividing Line', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-8w2d70y