1997A&A...327.1114L


Query : 1997A&A...327.1114L

1997A&A...327.1114L - Astronomy and Astrophysics, volume 327, 1114-1122 (1997/11-3)

Long-term photometric flares patrol (1967-1977) on EV Lacertae: a clear evidence of a longitude concentrated flaring activity in 1970.

LETO G., PAGANO I., BUEMI C.S. and RODONO M.

Abstract (from CDS):

We report on a large sample of homogeneous photoelectric data obtained by monitoring the red dwarf flare star EV Lac. The data were collected in 10 years (1967-77) at Catania Astrophysical Observatory on Mt. Etna and consist of 212, 170, and 128 flares detected in the U, B and V band during total monitoring times of 903, 1013, and 864 hours, respectively. The peak luminosity, the total energy emitted, the rise and decay times were measured for each flare. A statistical analysis of this data sample is presented. A well defined phase modulation of the normalized flare occurrence rate in 1970 clearly suggests that, at that time, on EV Lac flaring activity was concentrated at a preferred longitude.

Abstract Copyright:

Journal keyword(s): stars: individual: EV Lac - stars: flare - activity - rotation

VizieR on-line data: <Available at CDS (J/A+A/327/1114): table2 table2.tex>

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 - 2022
#notes
1 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0V 846 2

Query : 1997A&A...327.1114L

Basic data :
V* EV Lac -- Eruptive variable Star
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (2015ApJS,BD,...), PM* (2013MNRAS,Ci,...), X (2009ApJ,RE,...), ** (**,CCDM,...), IR (IRAS,2MASS,...), UV (2EUVE,EUVE,...), Er* (2017ARep,[GKL99]), V* (V*), Rad ([CGL99])
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
22 46 49.7312610268 +44 20 02.374381562 (Optical) [ 0.0141 0.0160 90 ] A 2020yCat.1350....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
22 44 39.9330829804 +44 04 35.362299971 [ 0.0141 0.0160 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
100.6067176270883 -13.0693645782006 [ 0.0141 0.0160 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-706.216 -458.920 [0.018 0.020 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 0.287 [0.0017] / z(spectroscopic) 0.000001 [0.000000] / cz 0.29 [0.00]
   (Opt) A 2018A&A...616A...7S
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
197.9573 [0.0220] A 2020yCat.1350....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
M4.0V C 2013AJ....145..102L
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (7) :
B 11.85 [0.09] D 2012yCat.1322....0Z
V 10.26 [0.06] D 2012yCat.1322....0Z
R 9.89 [0.02] D 2012yCat.1322....0Z
G 9.005235 [0.002809] C 2020yCat.1350....0G
J 6.106 [0.030] C 2003yCat.2246....0C
H 5.554 [0.031] C 2003yCat.2246....0C
K 5.299 [0.024] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
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Some important notes on this object about identifications and objects associations.
notes:

  • Two candidate companions identified in 2010PASP.122.1195T
  • Improperly named GJ 873 A in some references : please use GJ 873.


Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 94 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (57) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

BD+43 4305 HIP 112460 PPM 63398 V* EV Lac
** HER 5A IDS 22426+4349 A 2RE J224651+442011 VVO 299
AG+44 2119 IRAS 22446+4404 2RE J2246+442 WDS J22468+4420A
ASCC 447839 JP11 175 RE J224651+442019 WEB 20058
CCDM J22468+4420A Karmn J22468+443 RE J2246+442 WISEA J224649.04+441957.3
Ci 20 1382 LFT 1737 RE J224647+441955 Zkh 337
CSI+43 4305 1 LHS 3853 RX J2246.8+4420 [CGL99] 25
2EUVE J2246+44.3 LSPM J2246+4420 1RXS J224650.7+442008 [FS2003] 1177
EUVE J2246+44.3 LTT 16695 TIC 154101678 [GKL99] 435
GAT 1203 2MASS J22464980+4420030 TYC 3226-2288-1 [RHG95] 3584
GCRV 14312 MCC 852 UBV 19534 Gaia EDR3 1934263333784036736
GEN# +0.04304305A NLTT 54837 UBV 19530 Gaia DR2 1934263333784036736
G 216-16 8pc 198.00 UCAC2 46990456
GJ 873 PLX 5520 UCAC4 672-113378
HIC 112460 PM J22468+4420 USNO-B1.0 1343-00505631

References (846 between 1850 and 2022) (Total 846)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

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                 or select by : (not exhaustive, explanation here)


Collections of Measurements


velocities : 12    V* : 2    distance : 3    ROT : 3    Fe_H : 10    PLX : 4    PM : 10    MK : 10   

   

Observing logs


ISO : 2    IUE : 78    XMM : 2   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* EV Lac

Link by name to the catalogue in VizieR :

BD+43 4305 AG+44 2119 CCDM J22468+4420A EUVE J2246+44.3 G 216-16
GJ 873 HIC 112460 HIP 112460 IRAS 22446+4404 LHS 3853
LSPM J2246+4420 2MASS J22464980+4420030 NLTT 54837 PLX 5520 PPM 63398
2RE J224651+442011 2RE J2246+442 1RXS J224650.7+442008 TYC 3226-2288-1 UCAC2 46990456
UCAC4 672-113378 USNO-B1.0 1343-00505631 V* EV Lac WDS J22468+4420A WISEA J224649.04+441957.3
[GKL99] 435 Gaia EDR3 1934263333784036736 Gaia DR2 1934263333784036736

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2022.05.22-01:30:08

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