Goddard High-Resolution Spectrograph Observations of beta Geminorum

Details Goddard High-Resolution Spectrograph Observations of beta Geminorum Goddard High-Resolution Spectrograph Observations of beta Geminorum

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.6714o&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #67.14; Bulletin of the American Astronomical Society, Vol. 30, p.919

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on a rich set of observations of the K0 III star beta Geminorum (Pollux) with the Goddard High-Resolution Spectrograph (GHRS). The dataset consists of low-dispersion spectra (lambda /Delta lambda = 2,000) of the 1169 - 1671 Angstroms region, moderate dispersion spectra (lambda /Delta lambda = 20,000) of selected spectral intervals, and echelle observations (lambda /Delta lambda = 90,000) of the O I resonance lines and Mg II h and k lines. We perform an analysis of intersystem lines and determine the emission measure distribution, from which we infer properties of the stellar transition region. The line profile shapes do not reveal evidence of broad components, similar to what is observed in the atmosphere of the inactive star Procyon and unlike what is observed in active stars. We find a trend of increasing redshift with line formation temperature up to a maximum log T of 5.2, and a decrease for temperatures greater than log T of 5.2, similar to what is seen on the Sun and dissimilar to what is seen on Procyon. We interpret these findings in light of differences in activity and atmospheric structure.

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