2001A&A...372..922L


Query : 2001A&A...372..922L

2001A&A...372..922L - Astronomy and Astrophysics, volume 372, 922-924 (2001/6-4)

A possible dependence of DF Tauri's photometric activity on the relative orbital positions of the binary components.

LAMZIN S.A., MELNIKOV S.Y., GRANKIN K.N. and EZHKOVA O.V.

Abstract (from CDS):

We constructed a DF Tau historical lightcurve to analyze the character of stellar variability from 1900 to 2000. This time interval exceeds the orbital period P≃80yrs of the double system. At least two sections of enhanced photometric activity are present in the lightcurve, with the time interval between them being close to P/2. They correspond to the sections of the DF Tau companion orbit intermediate between apo- and periastron. A decrease in stellar activity occured near the last periastron epoch. We conclude that long-term variations of DF Tau activity are the result of modulation of primary circumstellar disc accretion rate by orbital motion of the companion. We predict that DF Tau activity will increase significantly in the near future.

Abstract Copyright:

Journal keyword(s): stars: individual: DF Tau - stars: pre-main sequence - stars: variables - stars: binary - circumstellar matter - accretion stars:

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 - 2024
#notes
1 V* DF Tau TT* 04 27 02.7932020080 +25 42 22.453341516 11.97 12.25 11.42 10.31 9.14 M3Ve 500 1

Query : 2001A&A...372..922L

Basic data :
V* DF Tau -- T Tauri 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:
* (HD,AP,...), Y*O (2010ApJS), TT* (1999AJ), ** (**,WDS), V* (V*,AAVSO), MIR (AKARI,WISE), Or* (2017ARep), out ([LLQ2015]), SB* (2012ApJ), Em* (HBC), EmO (MHA), X (2E), NIR (2MASS), IR (IRAS)
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) :
04 27 02.7932020080 +25 42 22.453341516 (Optical) [ 0.4483 0.2724 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) :
04 23 59.6487851882 +25 35 42.246229579 [ 0.4483 0.2724 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) :
172.1467830750008 -15.9423065942135 [ 0.4483 0.2724 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 :
2.207 -26.458 [0.565 0.403 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) 17.964300 [0.007957] / z(spectroscopic) 0.000060 [0.000000] / cz 17.96 [0.01]
   (NIR) A 2020AJ....160..120J
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):
5.6672 [0.4998] 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:
M3Ve C 1977ApJ...214..747H
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 (10) :
U 11.97 [~] C 2002yCat.2237....0D
B 12.25 [~] C 2002yCat.2237....0D
V 11.42 [~] C 2002yCat.2237....0D
R 10.31 [~] C 2002yCat.2237....0D
G 11.058810 [0.008221] C 2020yCat.1350....0G
I 9.14 [~] C 2002yCat.2237....0D
J 8.171 [0.026] C 2003yCat.2246....0C
H 7.256 [0.023] C 2003yCat.2246....0C
K 6.734 [0.024] C 2003yCat.2246....0C
r 12.80 [~] D 2012ApJS..202....7X
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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:


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

: 2 : 2811 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (36) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 283654 GCRV 55076 2MASS J04270280+2542223 V* DF Tau B
** THB 1 GSC 01820-00525 MHA 259-11 V* DF Tau
AKARI-IRC-V1 J0427028+254222 HBC 36 SSTtau 042702.8+254222 WDS J04271+2542AB
AP J04270280+2542223 HIC 20777 SV* SVS 1077 WISE J042702.79+254222.2
CSI+25-04235 HIP 20777 TIC 268016868 WISE J042702.80+254222.2
CSI+25-04240 IRAS 04240+2535 TYC 1820-1418-1 [LLQ2015] TMO 29
2E 1039 IRAS F04239+2535 UBV 4281 AAVSO 0420+25A
2E 0424.0+2535 JP11 5479 UCAC2 40811057 Gaia DR3 151179966897747840
EPIC 247986526 JP11 5480 V* DF Tau A Gaia DR2 151179966897747840

References (500 between 1850 and 2024) (Total 500)
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


velocities : 4    V* : 1    diameter : 1    distance : 2    ROT : 4    Fe_H : 2    PLX : 4    PM : 4    MK : 10   

   

Observing logs


herschel : 2    IUE : 34   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* DF Tau

Link by name to the catalogue in VizieR :

HD 283654 AKARI-IRC-V1 J0427028+254222 AP J04270280+2542223 2E 1039 GSC 01820-00525
HIC 20777 HIP 20777 IRAS 04240+2535 IRAS F04239+2535 2MASS J04270280+2542223
TYC 1820-1418-1 UCAC2 40811057 V* DF Tau A V* DF Tau B V* DF Tau
WDS J04271+2542AB WISE J042702.79+254222.2 WISE J042702.80+254222.2 Gaia DR3 151179966897747840 Gaia DR2 151179966897747840

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