A dataset provided by the European Space Agency

Name 050236
Title The hottest cool star:Probing the X-ray emission of the low activity star Altair


DOI 10.5270/esa-khzl1ll
Author Dr Jan Robrade
Description We propose to observe the low activity star Altair (HD 187642) with XMM-Newton. With a spectral type of A7 it is the earliest, magnetically active, single late- type star detected by ROSAT and Einstein. At a distance of only 5 pc it is a unique target to study the X-ray properties of late A stars in detail. Altair is known to be a very fast rotator, however its X-ray luminosity of 2-3x10^27 erg-s is rather low and its L_X-L_bol ratio is the lowest measured in any nearby star. We want to obtain an RGS spectrum that allows to measure the Ne-O abundance in a low activity star, addressing the controversially debated solar and stellar neon abundance.The observation will enable us to investigate the properties of coronal plasma in a star with very shallow convection zone for the first time.
Publication Altair - the ''hottest.. magnetically active star in X-rays . Robrade, J., Schmitt, J. H. M. M., . A&A . 497-511 . 2009 . 2009A&A...497..511R ,
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 ,
The XMM Cluster Survey: X-ray analysis methodology . Lloyd-Davies, E. J., Romer, A. Kathy, et all. . MNRAS . 418-14 . 2011 . 2011MNRAS.418...14L ,
Exospheric solar wind charge exchange as seen by XMM-Newton . Carter, J. A., Semba, S., . AN . 333-313 . 2012 . 2012AN....333..313C ,
Classification of X-Ray Sources in the XMM-Newton Serendipitous Source Catalog . Lin, Dacheng, Webb, Natalie A., . ApJ . 756-27 . 2012 . 2012ApJ...756...27L ,
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 diversity of quasars unified by accretion and orientation . Shen, Yue, Ho, Luis C., . Natur . 513-210 . 2014 . 2014Natur.513..210S ,
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 F...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2007-10-17T22:51:55Z/2007-11-01T19:56:31Z
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 2008-11-28T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2008-11-28T00:00:00Z, 050236, 17.56_20190403_1200. https://doi.org/10.5270/esa-khzl1ll