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.
<Astron. J., 153, 170-170 (2017)>
=2017AJ....153..170Y 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*105 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 113 1847 Mira candidates
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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
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Bytes Format Units Label Explanations
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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] 1σ uncertainty in Per
49- 53 F5.2 mag <Imag> [16.93/21.45] Mean I-band magnitude
55- 58 F4.2 mag e_<Imag> [0.02/0.6] 1σ uncertainty in
60- 63 F4.2 mag Amp [0.6/5.66] Amplitude of best-fit periodic
component (AP)
65- 68 F4.2 mag e_Amp [0.01/1] 1σ uncertainty in Amp
70- 74 F5.2 mag Imin [16.13/20.83] Brightest I-band magnitude of the
best-fit model light curve (Im)
76- 79 F4.2 mag e_Imin [0.01/1.02] 1σ 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 (Δt)
99-104 F6.1 d T0 [322.9/3307.1] Time of maximum light for the
periodic component, in MJD (T0)
106-113 A8 --- photID Internal photometric identification
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Note (1): We classified 1581 and 266 objects as O-rich and C-rich, respectively.
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History:
From electronic version of the journal
References:
Pellerin et al., Paper I 2011ApJS..193...26P 2011ApJS..193...26P, Cat. J/ApJS/193/26
(End) Sylvain Guehenneux [CDS] 02-Aug-2017