Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1208j&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #12.08; Bulletin of the American Astronomical Society, Vol. 34, p.1113
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from our cycle 10 HST program to search for transition region emission in very low mass stars in the spectral range M7-M9. Our program is aimed at 1) detecting emission; and 2) distinguishing between flaring and persistent origin for the emission. We have obtained time series observations of HST/STIS spectra of three active, very low mass stars (VB8, VB10, and LHS 2065) which reveal persistent emission in transition region lines including Si IV, C IV, and He II. This emission does show variability from one exposure to the next, but is always observed. A strong flare was also observed in one 10 minute exposure on VB10. Our preliminary analysis indicates that active, very low mass stars maintain a chromosphere and transition region that is similar to those observed in active, earlier type M dwarfs, in contrast to suggestions that these low mass stars exhibit only flaring activity. This research was made possible by grant HST-GO-9090 from the Space Telescope Science Institute, operated by AURA for NASA.
Hawley Suzanne L.
Johns-Krull Christopher M.
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