NUV Extension of the Arcturus Project: Probing the Onset of Chromospheric Heating

Details NUV Extension of the Arcturus Project: Probing the Onset of Chromospheric Heating NUV Extension of the Arcturus Project: Probing the Onset of Chromospheric Heating

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8614h&link_type=abstract

HST Proposal ID #8614

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #8614 Cool Stars

Scientific paper

Two stars have multi-wavelength atlases at resolutions {R>= 100, 000} high enough to resolve dynamically interesting line structure: the Sun {G2 V} and Arcturus {K2 III}. These canonical atlases provide an astrophysical test bench for studying the effects of temperature, gravity, and metalicity in cool stars. We have produced high resolution spectral atlases of the Sun from 22 Mum through the visible, as well as a high resolution spectral atlas of Arcturus from 5 Mum through 0.9 Mum. These atlases are widely used for line identification, calibrating atomic data, testing model atmospheres, studying stellar granulation, etc. We are currently finishing a major new digital atlas of the Sun and Arcturus from 3600-9000 Angstrom at R=150, 000 {to be published next year as an ASP monograph}. We propose to extend the spectral coverage of these atlases down to 2124 Angstrom, using existing STIS spectra of Alpha Cen A {as a solar proxy} and new STIS observations of Arcturus. The NUV spectrum is astrophysically important because it encompasses the transition from the photosphere through the temperature minimum into the chromosphere. Modeling the spectroscopic transition from absorption to emission lines will provide important semi-empirical constraints on the poorly understood nonradiative heating processes that give rise to chromospheres in evolved stars.

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