2017ApJ...851...91N

Query : 2017ApJ...851...91N

2017ApJ...851...91N - Astrophys. J., 851, 91-91 (2017/December-3)

Statistical studies of solar white-light flares and comparisons with superflares on solar-type stars.

NAMEKATA K., SAKAUE T., WATANABE K., ASAI A., MAEHARA H., NOTSU Y., NOTSU S., HONDA S., ISHII T.T., IKUTA K., NOGAMI D. and SHIBATA K.

Abstract (from CDS):

Recently, many superflares on solar-type stars have been discovered as white-light flares (WLFs). The statistical study found a correlation between their energies (E) and durations (τ): τ∝E0.39, similar to those of solar hard/soft X-ray flares, τ∝E0.2–0.33. This indicates a universal mechanism of energy release on solar and stellar flares, i.e., magnetic reconnection. We here carried out statistical research on 50 solar WLFs observed with Solar Dynamics Observatory/HMI and examined the correlation between the energies and durations. As a result, the E-τ relation on solar WLFs (τ∝E0.38) is quite similar to that on stellar superflares (τ∝E0.39). However, the durations of stellar superflares are one order of magnitude shorter than those expected from solar WLFs. We present the following two interpretations for the discrepancy: (1) in solar flares, the cooling timescale of WLFs may be longer than the reconnection one, and the decay time of solar WLFs can be elongated by the cooling effect; (2) the distribution can be understood by applying a scaling law (τ∝E1/3B–5/3) derived from the magnetic reconnection theory. In the latter case, the observed superflares are expected to have 2-4 times stronger magnetic field strength than solar flares.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): magnetic reconnection - stars: flare - Sun: flares - Sun: magnetic fields - Sun: magnetic fields

VizieR on-line data: <Available at CDS (J/ApJ/851/91): table1.dat table2.dat table3.dat>

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TYC 3126-3182-1 Er* 18 49 26.2202071368 +42 38 58.523003556   11.76 11.48     F7IV 14 0

Query : 2017ApJ...851...91N

Basic data :
TYC 3126-3182-1 -- Eruptive Variable
Other object types: otypes_help 		* (2009yCat,TYC,...), Er* (2016ApJ), Ro* (2014ApJS), NIR (2MASS)
ICRS coord. (ep=J2000) : 		18 49 26.2202071368 +42 38 58.523003556 (Optical) [ 0.0106 0.0123 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		18 47 52.5295635673 +42 35 26.842779753 [ 0.0106 0.0123 90 ]
Gal coord. (ep=J2000) : 		072.1415156572298 +18.3396753033803 [ 0.0106 0.0123 90 ]
Proper motions mas/yr : 		1.144 9.866 [0.014 0.015 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -44.557598 [0.022027] / z(spectroscopic) -0.000149 [0.000000] / cz -44.55 [0.02]
   (NIR) A 2020AJ....160..120J
Parallaxes (mas): 		2.4298 [0.0124] A 2020yCat.1350....0G
Spectral type: 		F7IV C 2016A&A...594A..39F
Fluxes (6) :
B 11.76 [0.08] D 2000A&A...355L..27H
V 11.48 [0.10] D 2000A&A...355L..27H
G 11.120150 [0.002769] C 2020yCat.1350....0G
J 10.035 [0.038] C 2003yCat.2246....0C
H 9.628 [0.038] C 2003yCat.2246....0C
K 9.173 [0.011] C 2003yCat.2246....0C
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Identifiers (9) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

TYC 3126-3182-1 KIC 7093428 TIC 123451553
AP J18492618+4238587 2MASS J18492618+4238587 Gaia DR2 2104786038081778560
GSC 03126-03182 SPOCS 2154 Gaia DR3 2104786038081778560

References (14 between 1850 and 2026) (Total 14)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 4    Distance : 2    Var : 1    Rot : 2    Fe/H : 6    Plx : 2    PM : 2    SpT : 1   

   

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TYC 3126-3182-1 AP J18492618+4238587 GSC 03126-03182 KIC 7093428 2MASS J18492618+4238587
Gaia DR2 2104786038081778560 Gaia DR3 2104786038081778560

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