A dataset provided by the European Space Agency

Name: The Discontinuous Drop in B Giant X-ray Emission at Spectra Type B1
Published: 2011-04-08T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	060105
Title	The Discontinuous Drop in B Giant X-ray Emission at Spectra Type B1
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0601050101
DOI	https://doi.org/10.5270/esa-wkq5op0
Principal Investigator, PI	Dr Wayne Waldron
Abstract	B supergiants display a discontinuous drop in X-ray emission along a dividingline in the H-R diagram (analogous to the one for K giants) which is clearlyrelated to the bi-stability jump (BSJ) at spectral type B1. Our study revealedseveral interesting and unexpected results, but some uncertainties have arisensince B supergiant winds are thick to soft X-rays. We now have observationalevidence that the BSJ extends to the lower luminosity B giants which have lowerwind densities, i.e., they do not have the B supergiant X-ray optical depthproblem. We are requesting XMM-Newton EPIC observations of 2 B giants tocomplement our 2 AO-6 B giant observations which will enhance our understandingof this B-star dividing line.
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 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 Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2010-03-14T13:16:18Z/2010-03-14T22:39:15Z
Version	21.51_20241115_1113
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	2011-04-08T00:00:00Z
Last Update	2026-07-09
Keywords	"supergiants display", "dividing line", "XMM-Newton", "spectral type b1", "lower luminosity", "supergiant winds", "lower wind densities", "discontinuous drop", "EPIC", "XMM", "xray emission", "soft xray", "giant xray emission", "spectra type b1", "star dividing line", "bsj extends", "diagram analogous"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Wayne Waldron, 2011, 'The Discontinuous Drop in B Giant X-ray Emission at Spectra Type B1', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-wkq5op0
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.