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J/A+A/445/423    WeCAPP Survey. M31 variables       (Fliri+, 2006)

The Wendelstein Calar Alto Pixellensing Project (WeCAPP): the M 31 variable star catalogue. Fliri J., Riffeser A., Seitz S., Bender R. <Astron. Astrophys. 445, 423-439 (2006)> =2006A&A...445..423F
ADC_Keywords: Galaxies, photometry ; Stars, variable Keywords: galaxies: individual: M 31 - cosmology: dark matter - stars: variables: general - stars: variables: Cepheids - X-rays: stars Abstract: The observations in the WeCAPP microlensing survey towards the Andromeda galaxy (M31) for a period of three years (2000-2003) resulted in a database with unprecedented time coverage for an extragalactic variable star study. We have monitored a 16.1' x 16.6' field centered on the nucleus of M31 in two optical bands (R and I) using the 0.8-m telescope at Wendelstein, Germany and the 1.2-m telescope at Calar Alto, Spain. Using the difference imaging method we detected 23781 variable sources for which we calculated the periods and variation amplitudes. We classified the variables according to their position in the R-band period-amplitude plane. Three groups can be distinguished; while the first two groups can be mainly associated with Cepheid-like variables (population I Cepheids in group I; type II Cepheids and RV Tauri stars in group II), the third one consists of Long Period Variables (LPVs). We detected 37 RV Tauri stars and 11 RV Tauri candidates, which makes this catalogue one of the largest collections of this class of stars to date. The classification scheme is supported by Fourier decomposition of the light curves. The catalogue of variable stars contains the positions, the periods in R and I, the significance of the assigned periods, and the variation amplitudes in the R and I bands. Description: Observations of M31 were obtained using the 0.8-m telescope at Wendelstein, Germany and the 1.2-m telescope at Calar Alto, Spain, over three observing seasons, from 2000 to 2003. Two broad-band filters, R and I close to Kron-Cousins system, were employed. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 82 23781 Variables in Group 1-3 table2a.dat 82 33 Cepheids in group I table2b.dat 82 93 Type II Cepheids
Bytes Format Units Label Explanations
1- 5 I5 --- Seq V Catalogue identifier, [FRS2006] WeCAPP VNNNNN in Simbad 7- 8 I2 h RAh Right ascension (J2000) 9 A1 --- --- [:] 10- 11 I2 min RAm Right ascension (J2000) 12 A1 --- --- [:] 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 22 A1 --- --- [:] 23- 24 I2 arcmin DEm Declination (J2000) 25 A1 --- --- [:] 26- 30 F5.2 arcsec DEs Declination (J2000) 32- 40 F9.4 d RPer ?=-99.00 Period derived from R band data 42- 47 F6.2 [-] RSig ?=-99.00 -log10 of significance of RP (1) 49- 57 F9.4 d IPer ?=-99.00 Period derived from I band data 59- 64 F6.2 [-] ISig ?=-99.00 -log10 of significance of IP (1) 66- 71 F6.2 10-5Jy Ramp Amplitude in broad-band R filter (2) 73- 78 F6.2 10-5Jy Iamp Amplitude in broad-band I filter (2) 80- 82 A3 --- Cl Classification (3)
Note (1): False alarm probability from Lomb's periodogram Note (2): Half of the flux variation Deltaf between minimum and maximum Note (3): Classification defined as follows: DC = classical or Delta-Cepheids SC = s-Cepheids BC = beat Cepheids IC = intermediate Cepheids W = type II Cepheids RV = RV Tauri stars rv = RV Tauri candidates S = regular or semi-regular red variables I = irregular variables E = eclipsing binaries N = novae RCB = R Coronae Borealis candidates M = miscellaneous variables L = long-period variables U = unclassified

(End) Juergen Fliri [Munich], Francois Ochsenbein [CDS] 21-Jul-2006

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