A dataset provided by the European Space Agency

Name: The X-ray emission of the sdO stars Feige 34 and BD+28 4211
Published: 2019-05-21T22:00:00Z

Proposal ID	080010
Title	The X-ray emission of the sdO stars Feige 34 and BD+28 4211
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0800100101
DOI	https://doi.org/10.5270/esa-o99lwld
Principal Investigator, PI	Mr Nicola La Palombara
Abstract	The XMM observation of HD49798, BD+37 442, and BD+37 1977 allowed us tocharacterize their spectral and timing properties, and to attribute the observedflux to wind accretion from the sdO star onto a WD or NS companion and/or toturbulence and shocks in the stellar wind of the sdO star itself. A Chandrasurvey of a complete flux-limited sample of sdO stars provided a clear detectionalso of the sdO stars BD+28 4211 and Feige 34. While the former subdwarfs areluminous and He-rich sdO stars, the latter ones are compact He-poor stars. Theyare the first stars of this type detected at X-rays; therefore, now we proposeto observe with XMM also BD+28 4211 and Feige 34. This proposal was alreadyaccepted in priority C for the AO-14 and AO-15 observing periods, but no observation has been made to date.
Publications	Follow-up observations of X-ray emitting hot subdwarf stars: the compact He-poor sdO star Feige 34 \|La Palombara, N., Mereghetti, S., et al. \| A&A \| 626-29 \| 2019 \| 2019A&A...626A..29L \| http://ui.adsabs.harvard.edu/#abs/2019A&A...626A..29L 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2018-04-27T22:24:13Z/2018-04-28T14:14:13Z
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	2019-05-21T22:00:00Z
Keywords	"sdo stars feige", "sdo star", "wind accretion", "XMM", "ns companion", "1977 allowed", "stellar wind", "sdo stars bd", "sdo stars provided", "chandra survey", "xray emission", "rich sdo stars", "former subdwarfs"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Mr Nicola La Palombara, 2019, 'The X-ray emission of the sdO stars Feige 34 and BD+28 4211', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-o99lwld