The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis

Details The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421l..39h&link_type=abstract

Astrophysical Journal, Part 2 (ISSN 0004-637X), vol. 421, no 1, p. L39-L42

Astronomy and Astrophysics

Astronomy

21

Light Emission, Sky Surveys (Astronomy), Stellar Coronas, Ultraviolet Photometry, Ultraviolet Spectroscopy, Computer Programs, Extreme Ultraviolet Explorer Satellite, Rosat Mission, Signal To Noise Ratios, Spectrometers, Velocity

Scientific paper

We present an extreme ultraviolet coronal spectrum of the solar-type star chi1 Ori (G0 V), one of the first spectra obtained as a guest observation using the Extreme Ultraviolet Explorer (EUVE). This star is younger and more active than the Sun. Since no large-scale flare activity was evident in the simultaneous deep-survey EUV photometry, we simulated the spectrum using a solar active region differential emission measure (DEM) together with the plasma emissivity code of Mewe, Gronenschild, & van den Oord (1985). The spectral simulation was normalized to the soft X-ray flux (0.1-2.4 keV) observed during the ROSAT all-sky survey and also the EUVE all-sky survey Lexan/B filter count rate to generate predicted counts in spectral bins in order to identify lines and line blends in the observed spectrum. The difference between these two normalizations was found to be less than 20%. We also compare both the observed and simulated spectra to the Capella observations of Dupree et al. (1993). The accuracy of the emission code and of this spectral simulation is demonstrated by its excellent fit to the high signal-to-noise ratio data in the short-wavelength spectrum of Capella. For chi1 Ori we conclude the following: (1) apart from the He II lines, we do not see many of the expected lines forming at log T less than or equal to 6.2; (2) in the range log T = 6.3-6.8 we find reasonable agreement with a spectrum simulating the DEM of a solar active region; and (3) material appears to be present at temperature as hot as log T = 7.2 (Fe XXIV).

Affiliated with

Also associated with

No associations

Rating

The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The extreme ultraviolet coronal spectrum of the solar-type star chi1 Orionis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-866313