A dataset provided by the European Space Agency

Name 030101
Title X-ray spectroscopy of H1504+65, an extremely hot bare stellar core
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0301010101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0301010201

DOI 10.5270/esa-1l21nv0
Author Prof Klaus Werner
Description H1504+65 is the hottest known white dwarf (Teff=200,000 K). Its photosphere is mainly composed of carbon and oxygen, hence this unique white dwarf resembles the bare stellar core of a former red giant. Because of its high effective temperature H1504+65 is the only star at all which shows a photospheric absorption line spectrum in the soft X-ray region. We have analysed a Chandra spectrum and identified a wealth of spectral lines from highly ionized O, Ne, and Mg. We also detect nickel lines but, surprisingly, fail to detect iron. The reduced iron opacity allows thermal radiation to escape from deep hot layers. Our models predict that XMM-Newton could for the first time acquire a stellar photospheric spectrum in the 10-30 Angstroem (1.2-0.4 KeV) region. This enables a precise temperature determination.
Publication The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue . Watson, M. G., Schroder, A. C., et all. . A&A . 493-339 . 2009 . 2009A&A...493..339W ,
Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras . Mateos, S., Saxton, R. D., et all. . A&A . 496-879 . 2009 . 2009A&A...496..879M ,
The XMM Cluster Survey: optical analysis methodology and the first data release . Mehrtens, Nicola, Romer, A. Kathy, et all. . MNRAS . 423-1024 . 2012 . 2012MNRAS.423.1024M ,
An All-Sky Atlas of Radio-X-ray Associations . Flesch, E., . PASA . 27-283 . 2010 . 2010PASA...27..283F ,
The XMM Cluster Survey: X-ray analysis methodology . Lloyd-Davies, E. J., Romer, A. Kathy, et all. . MNRAS . 418-14 . 2011 . 2011MNRAS.418...14L ,
An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities . Henley, David B., Shelton, Robin L., . ApJS . 202-14 . 2012 . 2012ApJS..202...14H ,
The XMM-Newton serendipitous ultraviolet source survey catalogue . Page, M. J., Brindle, C., et all. . MNRAS . 426-903 . 2012 . 2012MNRAS.426..903P ,
Cross-correlation of the 2XMMi catalogue with Data Release 7 of the Sloan Digital Sky Survey . Pineau, F.-X., Motch, C., et all. . A&A . 527-126 . 2011 . 2011A&A...527A.126P ... 2012A&A...545A..66B ,
Automatic Classification of Time-variable X-Ray Sources . Lo, Kitty K., Farrell, Sean, et all. . ApJ . 786-20 . 2014 . 2014ApJ...786...20L ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
Sunyaev-Zel.dovich effect or not? Detecting the main foreground effect of most galaxy clusters . Xiao, Weike, Chen, Chen, et all. . MNRAS . 432-41 . 2013 . 2013MNRAS.432L..41X ,
The Interaction of the Fermi Bubbles with the Milky Way.s Hot Gas Halo . Miller, Matthew J., Bregman, Joel N., . ApJ . 829-9 . 2016 . 2016ApJ...829....9M ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Anisotropy of the galaxy cluster X-ray luminosity-temperature relation . Migkas, Konstantinos, Reiprich, Thomas H., . A&A . 611-50 . 2018 . 2018A&A...611A..50M ,
The XMM Cluster Survey: Present status and latest results . Viana, P. T. P., Mehrtens, N., et all. . AN . 334-462 . 2013 . 2013AN....334..462V ,
Testing emergent gravity on galaxy cluster scales . Tamosiunas, Andrius, Bacon, David, et all. . JCAP . 5-53 . 2019 . 2019JCAP...05..053T ,
Chandra Follow-up of the SDSS DR8 Redmapper Catalog Using the MATCha Pipeline . Hollowood, Devon L., Jeltema, Tesla, et all. . ApJS . 244-22 . 2019 . 2019ApJS..244...22H ,
Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters . Palmese, A., Annis, J., et all. . MNRAS . 493-4591 . 2020 . 2020MNRAS.493.4591P ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2005-09-25T07:32:05Z/2005-09-25T15:52:19Z
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 2006-10-18T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-10-18T00:00:00Z, 030101, 17.56_20190403_1200. https://doi.org/10.5270/esa-1l21nv0