GHRS Observations of Solar Neighborhood ZAMS K Dwarfs

Details GHRS Observations of Solar Neighborhood ZAMS K Dwarfs GHRS Observations of Solar Neighborhood ZAMS K Dwarfs

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18710302a&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #103.02; Bulletin of the American Astronomical Society, Vol. 27, p.1430

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We are currently obtaining (Sep-Nov 1995) GHRS observations of a unique, homogeneous group of 6 solar neighborhood (8 <= d <= 40 pc) Pleiades Moving Group K0-K2 dwarfs (HD 197890, HD 1405, HD 82558, HD 220140, HD 82443, HD 17925). The only significant variable between these stars is rotation (8 hr <= Prot <= 6.9 d), which is widely believed to be the single most important parameter behind non-radiative atmospheric activity at all levels of the atmosphere. In this poster, we will present the GHRS spectra, as well as a comparison of derived chromospheric and transition region (TR) properties \it as a function of rotation . We will \it ultimately \ use the GHRS spectra, combined with our EUVE, IUE, and ground-based observations of these stars to define the (currently unknown) upper atmospheric structure of a cool star at the point of hydrogen ignition, many years before transition region and coronal spectroscopy can be done on the nearest \it cluster ZAMS stars, the Pleiades early K dwarfs.

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