J/AJ/140/1402 M dwarf flares from SDSS spectra (Hilton+, 2010)
M dwarf flares from time-resolved Sloan Digital Sky Survey spectra.
Hilton E.J., West A.A., Hawley S.L., Kowalski A.F.
<Astron. J., 140, 1402-1413 (2010)>
=2010AJ....140.1402H 2010AJ....140.1402H
ADC_Keywords: Stars, late-type ; Stars, flare
Keywords: stars: flare - stars: late-type
Abstract:
We have identified 63 flares on M dwarfs from the individual component
spectra in the Sloan Digital Sky Survey (SDSS) using a novel
measurement of emission-line strength called the Flare Line Index.
Each of the ∼38000M dwarfs in the SDSS low-mass star spectroscopic
sample of West et al. (2008, Cat. J/AJ/135/785) was observed several
times (usually 3-5) in exposures that were typically 9-25 minutes in
duration. Our criteria allowed us to identify flares that exhibit very
strong Hα and Hβ emission-line strength and/or significant
variability in those lines throughout the course of the exposures. The
flares we identified have characteristics consistent with flares
observed by classical spectroscopic monitoring.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 77 63 Properties of the flares in the SDSS
spectroscopic sample
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See also:
J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg SDSS right ascension (J2000.0)
11- 18 F8.5 deg DEdeg SDSS declination (J2000.0)
20- 21 A2 --- SpT MK spectral type
23- 25 A3 --- Sample Sample: HSN (high signal/noise) or MSN (medium)
27- 28 I2 --- Nexp Number of exposure (1)
30- 36 A7 --- Meth Method used (2)
38- 52 A15 --- Notes Notes (3)
54- 57 A4 --- --- [SDSS]
59- 77 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s), added by CDS
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Note (1): This is the number with no cosmis ray in either Hα or
Hβ line regions.
Note (2): The method used to identify flares.
* SL is the strong line criterion (see Section 4.1) and
* V1, V2, and V3 are the three variability criteria (see Section 4.2).
Note (3): "Rise," "peak," and "decay" phase flares are defined in Section 5.1.1.
We also note flares in which at least one spectrum is in quiescence, as well
as the two flares with enhanced continuum emission (discussed in
Section 5.1.3).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-Jul-2012