A dataset provided by the European Space Agency

Name 069068
Title The Drop in X-ray Flux at Spectral Type B1:Evidence for a B-Star Dividing Line?


DOI 10.5270/esa-hoe7fom
Author Dr Wayne Waldron
Description All B star luminosity classes show a substantial drop in their X-ray emission between spectral type B1 and B2 suggesting an H-R diagram B-star dividing line somewhat analogous to the one for K giants. This emission appears to be related to the bi-stability jump at spectral type B1. But our analyses of B supergiant and giant XMM data revealed several interesting and unexpected results that do not support theoretical predictions. There seems to be a fundamental, unknown, underlying process at work in this spectral region. We now wish to extent our study by requesting XMM EPIC observations of 4 B main sequence stars and 1 additional B giant to help us explain the abrupt X-ray changes that are occurring in this intriguing region of the H-R diagram.
Publication Smooth X-ray variability from rho Ophiuchi A+B. A strongly magnetized primary B2 star? . Pillitteri, Ignazio, Wolk, Scott J., et all. . A&A . 567-4 . 2014 . 2014A&A...567L...4P ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
B stars seen at high resolution by XMM-Newton . Cazorla, Constantin, Naze, Yael, . A&A . 608-54 . 2017 . 2017A&A...608A..54C ,
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 2012-07-06T12:24:58Z/2013-03-21T11:21:59Z
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 2014-04-03T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2014-04-03T00:00:00Z, 069068, 17.56_20190403_1200. https://doi.org/10.5270/esa-hoe7fom