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II/233 Tycho variables stars (Piquard 2001)
Detection and classification of Tycho variables stars Piquard S. <PhD Dissertation, Strasbourg, (2001)>
ADC_Keywords: Stars, variable ; Magnitudes Description: We present the results of the classification procedure described in Piquard's PhD thesis applied to the 1091 stars presented in Piquard et al. (2001. Cat. J/A+A/373/576). In those six tables we give indication of variability type for all the stars detected as variables in Piquard et al. (2001, Cat. J/A+A/373/576). First of all, we looked for periodic signals in the light curves using adapted Renson's (Renson, 1978A&A....63..125R) and Stellingwerf's (Stellingwerf, 1978ApJ...224..953S) methods applied to the tree different photometric bands from Tycho (Cat. I/239): T, BT, VT (the T band is defined from the added count-rates in the BT and VT channels, Grossmann et al.. 1995A&A...304..110G). Then we developed a semi-automatic method using 5 parameters (Period, color index, reduced proper motion from Tycho-2 catalogue (Cat. I/259), 2 indicators of the shape of the light curve) and a maximum likelihood method, combined with a careful look on the light curves. Finaly, the identification of the variability type is kept only if the resulting light curve is convincing (periodic the star has the P status, if not periodic the star has the U status); else we need more information about the star and is has the A status. All this identifications are indications since the quality of the light curves are often poor, particularly when the star is fainter than T=10. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablet.dat 174 954 Stars detected as variable in T tableb-v.dat 174 107 Stars detected as variable in BT-VT thesis.ps 132 391718 PostScript version of the thesis
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) II/214 : Combined General Catalogue of Variable Stars (Kholopov+ 1998) J/A+A/373/576 : Detection of Tycho variables stars (Piquard+, 2001) Byte-by-byte Description of file: tablet.dat tableb-v.dat
Bytes Format Units Label Explanations
1 A1 --- Status [PUA] Status of the star (1) 4- 15 A12 --- TYC Tycho designation (Cat. I/239) 17- 28 F12.8 deg RAdeg Tycho right ascension (ICRS, Epoch 1991.25) 30- 41 F12.8 deg DEdeg Tycho declination (ICRS, Epoch 1991.25) 43- 48 I6 --- HIP ?=0 Hipparcos (Cat. I/239) number 50- 55 A6 --- VarType Hipparcos variability type (P5 field of HIP) (2) 58- 60 I3 --- Nt Number of used detected transits 62- 67 F6.3 mag BTmag Tycho BT magnitude from Tycho-2 (Hoeg et al., 2000, Cat. I/259) 69- 74 F6.3 mag VTmag Tycho VT magnitude from Tycho-2 (Hoeg et al., 2000, Cat. I/259) 77- 85 F9.7 --- tT [0,1] Probability of a constant star to appear variable in T magnitude (3) 88- 96 F9.7 --- t(BT-VT) [0,1] Probability of a constant star to appear variable in (BT-VT) (3) 98 I1 --- VarFlag [1,3]? Amplitude flag (H6 field of HIP) (4) 100 A1 --- HvarType [CDMPRU] Period or Unsolved in Hipparcos (H52 field in HIP) (5) 102 A1 --- GN [GN] Cross identification with GCVS or NSV 104 A1 --- VarType2 [UVW] Variability flag from Tycho (T48 field) (6) 106 A1 --- Dup [RYZ] Duplicity detection from Tycho (T49 field) (7) 108 A1 --- An [AB] Flag marking either Annex A or Annex B of the Tycho Epoch Photometry Annexes (field T50) 112-120 A9 --- Name GCVS name of the star if existing 122-126 F5.3 d PerOld Known period 128-135 A8 --- SpType Spectral type from Simbad 137-147 F11.6 d Period Best period found 150-154 F5.3 d Ampl Amplitude of the light curve after best fit 157-161 F5.3 --- Dur Duration of the light curve after best fit (in phase unit) 163 A1 --- --- [APU] Status (repeated) (1) 165-172 A8 --- Type This work type of variability (ech: inadequate time sampling suspected) 174 A1 --- New [*] *: New variable
Note (1): Status of the stars: P: Stars found to be periodic U: Stars with no period found A: Stars needing more observations Note (2): This is the 6-letter type defined in the General Catalog of Variable Stars (Cat. II/214). See also the "Types of Variability" section below reproduced from the Hipparcos catalogue. Note (3): The values are calculated even for stars having less than 10 observations. The calculation of the probability is then uncertain. Note (4): The values are 1: < 0.06mag ; 2: 0.06-0.6mag ; 3: >0.6mag Note (5): Hipparcos-defined type of variability (a blank entry signifies that the entry could not be classified as variable or constant): C : no variability detected ("constant") D : duplicity-induced variability M : possibly micro-variable (amplitude < 0.03mag) P : periodic variable R : V-I colour index was revised due to variability analysis U : unsolved variable which does not fall in the other categories Note (6): Tycho variability flag: U : apparent variability in the Tycho data; may be due to duplicity V : strong evidence of intrinsic variability W : suspected intrinsic variability Note (7): Tycho duplicity flag: D: duplicity clearly indicated (BTmag and VTmag refer to combined light) R: duplicity weakly indicated, combined with indication of variability S: duplicity suspected Y: investigation for duplicity carried out on Tycho data, no indication of duplicity was found Z: investigation for duplicity not carried out blank: Hipparcos star not observed by Tycho
Types of Variability: (copied from Hipparcos I/239 ReadMe): -------------------------------------------------------------------------------- Code Description Class of Variable -------------------------------------------------------------------------------- ACV α2 Canum Venaticorum type (including ACVO) rotating ACYG α Cygni type pulsating BCEP β Cephei type (including BCEPS) pulsating BY BY Draconis type rotating CEP Cepheids (including CEP(B)) pulsating CST constant stars (considered as variable by some observer(s)) - CW W Virginis type pulsating CWA W Virginis type (periods > 8 days) pulsating CWB W Virginis type (periods < 8 days) pulsating DCEP δ Cephei type (including DCEPS) pulsating DSCT δ Scuti type (including DSCTC) pulsating E (E+, E/..) eclipsing binary EA Algol type (EA+, EA/..) eclipsing binary EB β Lyrae type (EB/..) eclipsing binary ELL rotating ellipsoidal (ELL+.. or/..) rotating EW W Ursae Majoris type (EW/i..) eclipsing binary FKCOM FK Comae Berenices type rotating GCAS γ Cassiopeiae type eruptive I irregular (I, IA, IB, In, InT, Is) eruptive IN irregular (INA, INAT, INB, INSA, INSB, INST, INT) eruptive IS irregular (ISA, ISB) eruptive L slow irregular (L, LB, LC) pulsating M Mira Ceti type pulsating N slow novae (NB, NC) cataclysmic NA fast novae cataclysmic NL nova-like cataclysmic NR recurrent novae cataclysmic PVTEL PV Telescopii type pulsating RCB R Coronae Borealis type eruptive RR RR Lyrae type (RR, RRAB, RRB, RRC) pulsating RS RS Canum Venaticorum type eruptive RV RV Tauri type (RV, RVA, RVB) pulsating SARV small-amplitude red variables pulsating/rotating SDOR S Doradus type eruptive SPB slowly pulsating B stars pulsating SR semi-regular (SR, SRA, SRB, SRC, SRD) pulsating SXARI SX Arietis type rotating SXPHE SX Phoenicis type pulsating UV UV Ceti type eruptive WR Wolf-Rayet eruptive XNG X-ray nova-like system X-ray binary XP X-ray pulsar X-ray binary ZAND Z Andromedae type cataclysmic Acknowledgements: Sandrine Piquard
(End) Patricia Bauer [CDS] 09-Nov-2001
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