A dataset provided by the European Space Agency

Proposal ID 067523
Title Polars - soft X-ray emitters?
Download Data Associated to the proposal

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230201
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230301
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230501
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230601
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0675230701

DOI https://doi.org/10.5270/esa-93tcl4i
Principal Investigator, PI Dr Axel Schwope
Abstract The defining criterion of polars (AM Herculis stars) was their prominent softX-ray emission, which led to numerous discoveries with the EINSTEIN, EXOSAT,ROSAT and EUVE satellites. XMM-Newton observations of those X-ray selectedpolars and genuine discoveries of new polar systems reveal growing evidence thatthe prevailence or even the existence of a soft X-ray component may be ratherthe exception than the rule. In the last decade polars were discovered inoptical surveys like the SDSS and the CSS. Here we propose XMM-Newtonobservations of 5 optically selected polars to search for soft X-ray spectralcomponents, answer the question why they escaped detection in past X-ray surveysand shed new light on the intrinsic energy distribution of polars.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2012-01-26T12:37:26Z/2012-04-10T20:59:28Z
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 2013-04-25T00:00:00Z
Last Update 2025-08-04
Keywords "XMM", "past xray surveys", "numerous discoveries", "XMM-Newton", "optical surveys", "soft xray component", "polar systems", "escaped detection", "xmm newton", "ROSAT", "SDSS", "growing evidence", "euve satellites", "genuine discoveries", "defining criterion", "decade polars", "energy distribution"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr Axel Schwope, 2013, 'Polars - soft X-ray emitters?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-93tcl4i