Transition Region Emission from Very Low Mass Stars | Zendy

Suzanne L. Hawley | Zendy; Christopher M. Johns–Krull | Zendy

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Transition Region Emission from Very Low Mass Stars

Author(s) -

Suzanne L. Hawley,

Christopher M. Johns–Krull

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/375630

Subject(s) - stars , physics , astrophysics , space telescope imaging spectrograph , flare , chromosphere , hubble space telescope , spectrograph , astronomy , main sequence , emission spectrum , low mass , spectral line

We present results from our cycle 10 HST program to search for transitionregion emission in very low-mass, main-sequence stars in the spectral rangeM7-M9. Our program is aimed at 1) detecting emission; and 2) distinguishingbetween flaring and quiescent origin for the emission. We have obtainedHST/STIS time series observations of three active, very low mass stars (VB 8,VB 10, and LHS 2065) which show persistent activity in transition region linesincluding Si IV, C IV, He II. Emission in transition region lines appears to bevariable between exposures, but is always observed. A strong flare was alsoobserved in one 10 minute exposure on VB 10. Our results indicate that active,very low-mass stars maintain a persistent quiescent chromosphere and transitionregion that is similar to those observed in active, earlier type M dwarfs, incontrast to suggestions that these low-mass, main-sequence stars exhibit onlyrelatively strong flares and no quiescent emission.Comment: 11 pages with 2 figures; accepted by ApJ Letter

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