The Detection of M Dwarf UV Flare Events in the GALEX Data Archives | Zendy

Barry Y. Welsh | Zendy; Jonathan Wheatley | Zendy; Mark Seibert | Zendy; Stanley E. Browne | Zendy; Andrew A. West | Zendy; Oswald H. W. Siegmund | Zendy; Tom A. Barlow | Zendy; Karl Förster | Zendy; Peter G. Friedman | Zendy; D. Christopher Martin | Zendy; Patrick Morrissey | Zendy; Todd Small | Zendy; Ted Wyder | Zendy; David Schiminovich | Zendy; Susan G. Neff | Zendy; R. Michael Rich | Zendy

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The Detection of M Dwarf UV Flare Events in the GALEX Data Archives

Author(s) -

Barry Y. Welsh,

Jonathan Wheatley,

Mark Seibert,

Stanley E. Browne,

Andrew A. West,

Oswald H. W. Siegmund,

Tom A. Barlow,

Karl Förster,

Peter G. Friedman,

D. Christopher Martin,

Patrick Morrissey,

Todd Small,

Ted Wyder,

David Schiminovich,

Susan G. Neff,

R. Michael Rich

Publication year - 2007

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/516640

Subject(s) - flare , physics , astrophysics , stars , sky , extreme ultraviolet lithography , ultraviolet , flare star , astronomy , magnitude (astronomy) , k type main sequence star , t tauri star , optics

We present the preliminary results from implementing a new software tool thatenables inspection of time-tagged photon data for the astronomical sourcescontained within individual GALEX ultraviolet images of the sky. We haveinspected the photon data contained within 1802 GALEX images to reveal rapid,short-term (<500 sec) UV source variability in the form of stellar flares. Themean associated change in NUV magnitude due to this flaring activity is2.7+/-0.3 mag. A list of 49 new UV variable-star candidates is presented,together with their associated Sloan Digital Sky Survey (SDSS) photometricmagnitudes. From these data we can associate the main source of these UV flareevents with magnetic activity on M-dwarf stars. Photometric parallaxes havebeen determined for 32 of these sources, placing them at distances ranging fromapproximately 25 to 1000pc. The average UV flare energy for these flare eventsis 2.5E30 ergs, which is of a similar energy to that of U-band, X-ray and EUVflares observed on many local M-dwarf stars. We have found that stars ofclasses M0 to M5 flare with energies spanning a far larger range and with anenergy approximately 5 times greater than those of later (M6 to M8) spectraltype.Comment: Accepted for the Astrophysical Journal Supplement, GALEX Special Issu

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