J/AJ/153/170 The M33 Synoptic Stellar Survey. II. Mira variables (Yuan+, 2017) ================================================================================ The M33 Synoptic Stellar Survey. II. Mira variables. Yuan W., He S., Macri L.M., Long J., Huang J.Z. =2017AJ....153..170Y (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Galaxies, nearby ; Stars, variable ; Photometry, RI Keywords: methods: statistical - stars: variables: general Abstract: We present the discovery of 1847 Mira candidates in the Local Group galaxy M33 using a novel semi-parametric periodogram technique coupled with a random forest classifier. The algorithms were applied to ~2.4*10^5^ I-band light curves previously obtained by the M33 Synoptic Stellar Survey. We derive preliminary period-luminosity relations at optical, near-infrared, and mid-infrared wavelengths and compare them to the corresponding relations in the Large Magellanic Cloud. Description: We carried out a search for Mira variables in M33 using sparsely sampled I-band light curves. We based our search on the observations of M33 obtained by Macri et al. 2001 (Cat. J/AJ/121/861) and Pellerin et al. 2011 (Cat. J/ApJS/193/26). These surveys covered most of the disk of this galaxy with a combined baseline of nearly a decade (1996 September to 1999 November for Macri et al. 2001, Cat. J/AJ/121/861; 2002 August to 2006 August for Pellerin et al. 2011, Cat. J/ApJS/193/26) mainly using the Fred L. Whipple Observatory (FLWO) 1.2m and the WIYN observatory 3.5m telescopes with a variety of cameras (see the respective publications for details). While images were obtained in multiple bandpasses (BVI), our analysis is only based on the I-band time-series photometry because Mira candidates fall below the detection limit in the bluer bands. Our final sample consists of 1847 Mira candidates (see Table2). File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 113 1847 Mira candidates -------------------------------------------------------------------------------- See also: J/AJ/152/164 : I-band light curves of OGLE LMC Miras (He+, 2016) J/AJ/149/117 : LMC infrared survey. I. Photometry of Cepheids (Macri+, 2015) J/AcA/63/21 : VI light curves of Galactic LPVs (Soszynski+, 2013) J/AcA/61/217 : Light curves of SMC long-period variables (Soszynski+, 2011) J/ApJS/193/26 : The M33 synoptic stellar survey. I. (Pellerin+, 2011) J/ApJ/705/1364 : MIR catalog of point sources in M33 (Thompson+, 2009) J/AcA/59/239 : Light curves of LMC long-period variables (Soszynski+, 2009) J/MNRAS/386/313 : IR observations of Mira variables (Whitelock+, 2008) J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006) J/AJ/121/861 : BVI photometry of central part of M33 (Macri+, 2001) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 16 A16 --- M33SSSJ IAU-standard identifier (M33SSSJ) 18- 25 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000) 27- 34 F8.5 deg DEdeg Declination in decimal degrees (J2000) 36- 41 F6.1 d Per [101.4/1555.8] Best-fit period 43- 47 F5.1 d e_Per [0.2/145.4] 1{sigma} uncertainty in Per 49- 53 F5.2 mag [16.93/21.45] Mean I-band magnitude 55- 58 F4.2 mag e_ [0.02/0.6] 1{sigma} uncertainty in 60- 63 F4.2 mag Amp [0.6/5.66] Amplitude of best-fit periodic component (A_P_) 65- 68 F4.2 mag e_Amp [0.01/1] 1{sigma} uncertainty in Amp 70- 74 F5.2 mag Imin [16.13/20.83] Brightest I-band magnitude of the best-fit model light curve (I_m_) 76- 79 F4.2 mag e_Imin [0.01/1.02] 1{sigma} uncertainty in Imin 81 A1 --- Cl [OC] Mira subclass (C=C-rich, or O=O-rich) (1) 83- 85 I3 --- N [10/168] Number of measurements in light curve 87- 90 F4.2 mag A [0.79/5.22] Magnitude range spanned by light curve data 92- 97 F6.1 d Dt [362.9/3235] Time range spanned by light curve data ({Delta}t) 99-104 F6.1 d T0 [322.9/3307.1] Time of maximum light for the periodic component, in MJD (T_0_) 106-113 A8 --- photID Internal photometric identification -------------------------------------------------------------------------------- Note (1): We classified 1581 and 266 objects as O-rich and C-rich, respectively. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Pellerin et al., Paper I 2011ApJS..193...26P, Cat. J/ApJS/193/26 ================================================================================ (End) Sylvain Guehenneux [CDS] 02-Aug-2017