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J/ApJ/850/137   ISLAndS project. III. Variable stars   (Martinez-Vazquez+, 2017)

The ISLAndS project. III. Variable stars in six Andromeda dwarf spheroidal galaxies. Martinez-Vazquez C.E., Monelli M., Bernard E.J., Gallart C., Stetson P.B., Skillman E.D., Bono G., Cassisi S., Fiorentino G., McQuinn K.B.W., Cole A.A., McConnachie A.W., Martin N.F., Dolphin A.E., Boylan-Kolchin M., Aparicio A., Hidalgo S.L., Weisz D.R. <Astrophys. J., 850, 137 (2017)> =2017ApJ...850..137M
ADC_Keywords: Stars, variable; Galaxies, nearby; Photometry, HST; Photometry, UBVRI Keywords: binaries: eclipsing ; galaxies: dwarf ; galaxies: stellar content ; stars : horizontal-branch ; stars: variables: Cepheids ; stars: variables: RR Lyrae Abstract: We present a census of variable stars in six M31 dwarf spheroidal satellites observed with the Hubble Space Telescope. We detect 870 RR Lyrae (RRL) stars in the fields of And I (296), II (251), III (111), XV (117), XVI (8), and XXVIII (87). We also detect a total of 15 Anomalous Cepheids, three eclipsing binaries, and seven field RRL stars compatible with being members of the M31 halo or the Giant Stellar Stream. We derive robust and homogeneous distances to the six galaxies using different methods based on the properties of the RRL stars. Working with the up-to-date set of Period-Wesenheit (I, B-I) relations published by Marconi et al., we obtain distance moduli of µ0=[24.49, 24.16, 24.36, 24.42, 23.70, 24.43]mag (respectively), with systematic uncertainties of 0.08mag and statistical uncertainties <0.11mag. We have considered an enlarged sample of 16 M31 satellites with published variability studies, and compared their pulsational observables (e.g., periods and amplitudes) with those of 15 Milky Way satellites for which similar data are available. The properties of the (strictly old) RRL in both satellite systems do not show any significant difference. In particular, we found a strikingly similar correlation between the mean period distribution of the fundamental RRL pulsators (RRab) and the mean metallicities of the galaxies. This indicates that the old RRL progenitors were similar at the early stage in the two environments, suggesting very similar characteristics for the earliest stages of evolution of both satellite systems. Description: Table 1 presents a compilation of updated values for the position of the center, absolute MV magnitude, reddening (E(B-V)), and structural parameters for each of the six observed galaxies under the ISLAndS project (hereafter called ISLAndS galaxies). The data for these six ISLAndS galaxies have been obtained under proposals GO-13028 and GO-13739 for a total of 111 HST orbits. They consist of one ACS pointing on the central region and a WFC3 parallel field (at 6' from the ACS center) for each galaxy. For further details about the ACS and WFC3 field location, the reader is referred to Figure 4 of Skillman+ (2017ApJ...837..102S), where the strategy and the description of the ISLAndS project is explained in depth. Summary of HST observations (table 2): -------------------------------------- Galaxy Obs. dates Orbits -------------------------------------- And I 2015 Sep 1-6 22 And II 2013 Oct 4-6 17 And III 2014 Nov 24-28 22 And XV 2014 Sep 17-20 17 And XVI 2013 Nov 20-22 13 And XXVIII 2015 Jan 20-25 20 -------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 93 6 Positions and structural parameters for the ISLAndS galaxies a1andi.dat 78 88 Observing log for And I dSph a1andii.dat 78 68 Observing log for And II dSph a1andiii.dat 78 88 Observing log for And III dSph a1andxv.dat 78 68 Observing log for And XV dSph a1andxvi.dat 78 52 Observing log for And XVI dSph a1and28.dat 78 80 Observing log for And XXVIII dSph b2andi.dat 66 6644 Photometry of the variable stars in AndI dSph b2andii.dat 66 4369 Photometry of the variable stars in AndII dSph b2andiii.dat 66 2552 Photometry of the variable stars in AndIII dSph b2andxv.dat 66 2057 Photometry of the variable stars in AndXV dSph b2andxvi.dat 66 117 Photometry of the variable stars in AndXVI dSph b2and28.dat 66 1800 Photometry of the variable stars in AndXXVIII dSph c3andi.dat 170 100 Cross-identification with the Pritzl+ (2004, J/AJ/127/318 and 2005, J/AJ/129/2232) catalog of variable stars in And I dSph c3andii.dat 170 73 Cross-identification with the Pritzl+ (2004, J/AJ/127/318 and 2005, J/AJ/129/2232) catalog of variable stars in And II dSph c3andiii.dat 170 56 Cross-identification with the Pritzl+ (2004, J/AJ/127/318 and 2005, J/AJ/129/2232) catalog of variable stars in And III dSph d4andi.dat 124 302 Pulsation parameters of the variable stars in And I dSph d4andii.dat 124 257 Pulsation parameters of the variable stars in And II dSph d4andiii.dat 124 116 Pulsation parameters of the variable stars in And III dSph d4andxv.dat 124 121 Pulsation parameters of the variable stars in And XV dSph d4andxvi.dat 124 9 Pulsation parameters of the variable stars in And XVI dSph d4and28.dat 124 90 Pulsation parameters of the variable stars in And XXVIII dSph
See also: B/hst : HST Archived Exposures Catalog (STScI, 2007) J/AJ/110/2166 : Variables in Sextans dSph galaxy (Mateo+ 1995) J/AJ/117/1313 : NGC 6441 VI photometry (Layden+, 1999) J/AJ/120/284 : Variables in Leo II dwarf spheroidal (Siegel+, 2000) J/AJ/124/3222 : VI photometry of Draco and UMi galaxies (Bellazzini+, 2002) J/AJ/123/3154 : RV light curves of variable stars in Leo A (Dolphin+, 2002) J/AJ/124/1464 : Variable stars in Andromeda VI (Pritzl+, 2002) J/AJ/127/318 : BV photometry of Andromeda II variables (Pritzl+, 2004) J/A+A/431/1189 : BV photometry of NGC 6822 variables (Baldacci+, 2005) J/AJ/129/267 : RR Lyrae variables in NGC 5272 (Cacciari+, 2005) J/AJ/129/2232 : Variable stars in And I and And III (Pritzl+, 2005) J/other/RMxAA/44.365 : New variable stars in NGC 6366 (Arellano Ferro+, 2008) J/AJ/136/1921 : Variable stars of Draco dSph (Kinemuchi+, 2008) J/ApJ/674/L81 : Variable stars in dwarf galaxy CVn I (Kuehn+, 2008) J/ApJ/699/1742 : LCID project. I. Cetus and Tucana variables (Bernard+, 2009) J/ApJ/712/1259 : LCID project. II. Variables in IC1613 (Bernard+, 2010) J/AJ/141/171 : RR Lyrae stars in ultra-deep fields of M31 (Jeffery+, 2011) J/AJ/142/107 : Variable stars in NGC 1466 (Kuehn+, 2011) J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012) J/A+A/539/A138 : RR Lyr variable stars in M32 (Fiorentino+, 2012) J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012) J/MNRAS/422/89 : Cetus dSph RR Lyrae (Monelli+, 2012) J/ApJ/756/121 : Variable stars in Her dwarf galaxy (Musella+, 2012) J/ApJ/779/7 : M31 dSph satellites. I. Variables in And XIX (Cusano+, 2013) J/ApJ/767/62 : RR Lyrae stars BV photometry in UMa I (Garofalo+, 2013) J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013) J/ApJ/786/147 : RR Lyrae pop. in the Phoenix dwarf galaxy (Ordonez+, 2014) J/AcA/64/177 : VI LCs of Galactic Bulge RR Lyrae (Soszynski+, 2014) J/PASP/126/616 : Variable stars in Leo I dSph (Stetson+, 2014) J/ApJ/784/76 : RR Lyrae in ESO294-G010 and ESO410-G005 (Yang+, 2014) J/ApJ/814/71 : Carina project IX: UBVI of Carina variables (Coppola+, 2015) J/AcA/65/233 : OGLE Magellanic Clouds anomalous Cepheids (Soszynski+, 2015) J/AJ/152/170 : RRLs in globulars. IV. UBVRI in Omega Cen (Braga+, 2016) J/ApJ/829/26 : Variables in Andromeda XXV field. III. (Cusano+, 2016) J/ApJ/833/167 : PAndAS view of Andromeda satellites. II. (Martin+, 2016) J/MNRAS/462/4349 : Variable stars in Sculptor dSph (Martinez-Vazquez+, 2016) J/MNRAS/455/2163 : BI LCs of DDO210 pulsating variables (Ordonez+, 2016) J/ApJ/842/60 : Variable stars in Logal Group gal. III. (Monelli+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- dSph Galaxy name 11- 12 I2 h RAh Hour of right ascension (J2000) 14- 15 I2 min RAm Minute of right ascension (J2000) 17- 20 F4.1 s RAs Second of right ascension (J2000) 22 A1 --- DE- Sign of declination (J2000) 23- 24 I2 deg DEd Degree of declination (J2000) 26- 27 I2 arcmin DEm Arcminute of declination (J2000) 29- 32 F4.1 arcsec DEs Arcsecond of declination (J2000) 34- 38 F5.1 mag VMag [-11.6/-7.3] Absolute V-band magnitude 40- 42 F3.1 mag e_VMag [0.2/0.4] Negative uncertainty on VMag 44- 46 F3.1 mag E_VMag [0.2/0.4] Positive uncertainty on VMag 48- 52 F5.3 mag E(B-V) [0.04/0.08] Reddening 54- 57 F4.2 --- ell [0.1/0.6] Ellipticity (ε=1-b/a) 59- 62 F4.2 --- e_ell [0.02/0.1] ell uncertainty 64- 66 I3 deg PA [30/140] Position angle 68- 69 I2 deg e_PA [1/15] PA uncertainty 71- 73 F3.1 arcmin rh [1/5.3] Half-light radius 75- 78 F4.2 arcmin e_rh [0.01/0.2] rh uncertainty 80 A1 --- u_rt [~] Uncertainty flag on rt 81- 84 F4.1 arcmin rt [4.3/22] Tidal radius 86- 88 F3.1 arcmin e_rt [0.9/1.2]? rt uncertainty 90- 93 A4 --- Ref References (1)
Note (1): References as follows: 1 = Martin et al. (2016, J/ApJ/833/167), 2 = McConnachie & Irwin (2006MNRAS.365.1263M), 3 = Ibata et al. (2007ApJ...671.1591I), 4 = Slater et al. (2015ApJ...806..230S), and 5 = Tollerud et al. (2013ApJ...768...50T).
Byte-by-byte Description of file: a1*.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Cam HST camera of observation (ACS or WFC3) 6- 7 I2 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 15 F4.1 s RAs Second of Right Ascension (J2000) 17 A1 --- DE- Sign of the Declination (J2000) 18- 19 I2 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000) 29- 46 A18 --- File FITS image filename as it appears in the HST archive (http://archive.stsci.edu/) 48- 57 A10 "Y/M/D" Obs.date Observation Date 59- 66 A8 "h:m:s" Obs.time UT start time 68- 72 A5 --- Filt Filter (F475W or F814W) 74- 78 I5 s Exp [987/1410] Exposure time
Byte-by-byte Description of file: b2*.dat
Bytes Format Units Label Explanations
1- 9 A9 --- dSph Galaxy name 10 A1 --- --- [-] 11- 14 A4 --- Star Variable star name, V### 16- 27 F12.6 d MJHD-F4 Modified Heliocentric Julian Date; F475W mid-exposure: HJD-2,400,000 29- 34 F6.3 mag F475Wmag [22.1/26.6]? HST F475W magnitudes 36- 40 F5.3 mag e_F475Wmag [0.01/0.8]? Uncertainty in F475Wmag 42- 53 F12.6 d MJHD-F8 Modified Heliocentric Julian Date; F814W mid-exposure: HJD-2,400,000 55- 60 F6.3 mag F814Wmag [21.8/28.1]? HST F814W magnitudes 62- 66 F5.3 mag e_F814Wmag [0.01/9.7]? Uncertainty in F814Wmag
Byte-by-byte Description of file: c3*.dat
Bytes Format Units Label Explanations
1- 4 A4 --- ID Identifier in Pritzl+ (2004, J/AJ/127/318 or 2005, J/AJ/129/2232) (1) 6- 10 F5.3 d PerP [0.2/1.7]?=9.999 Period from Pritzl+ (2004, J/AJ/127/318 or 2005, J/AJ/129/2232) 12- 17 A6 --- dSph Galaxy name 18 A1 --- --- [-] 19- 22 A4 --- Star Variable star name in ISLAndS Galaxy (2) 24- 28 F5.3 d Per [0.2/1.1]? Period, this work (2) 30-170 A141 --- Notes Notes on cross-identification
Note (1): Stars in AndII are <[PAJ2004] VNN> in Simbad whereas stars in AndI and AndIII are <[PAJ2005] And I VNNN> and <[PAJ2005] And III VNN> in Simbad, respectively. Note (2): Missing values explained in Notes.
Byte-by-byte Description of file: d4*.dat
Bytes Format Units Label Explanations
1- 9 A9 --- dSph Galaxy name 10 A1 --- --- [-] 11- 14 A4 --- Star Variable star name in ISLAndS project (1) 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 27 F6.3 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 40 F5.2 arcsec DEs Arcsecond of Declination (J2000) 42- 46 F5.3 d Per current Period, days 48- 53 F6.3 mag F475Wmag [22.9/26.2] HST/Camera F475W intensity-averaged magnitudes 55- 59 F5.3 mag F475WAmp [0.02/1.8] HST/Camera F475W amplitude 61- 66 F6.3 mag F814Wmag [22.3/25.4] HST/Camera F814W intensity-averaged magnitudes 68- 72 F5.3 mag F814WAmp [0.04/1.1] HST/Camera F814W amplitude 74- 79 F6.3 mag Bmag [23/26.4] Converted B band intensity-averaged magnitudes (2) 81- 85 F5.3 mag BAmp [0.1/2] Converted B band amplitude (2) 87- 92 F6.3 mag Vmag [22.7/26] Converted V band intensity-averaged magnitudes (2) 94- 98 F5.3 mag VAmp [0.09/1.6] Converted V band amplitude (2) 100-105 F6.3 mag Icmag [22.3/25.4] Converted Ic band intensity-averaged magnitudes (2) 107-111 F5.3 mag IcAmp [0.04/1.1] Converted Ic band amplitude 113-119 A7 --- Type Variable Type (3) 121-124 A4 --- Cam Camera used for F475W, F814W data (ACS or WFC3)
Note (1): Stars are <[MMB2017] {dSph}-{Star}> in Simbad. Note (2): HST F475W and F814W VEGAMAGs are transformed to Johnson-Cousins B,V,Ic using the equations obtained by Bernard+ (2009, J/ApJ/699/1742). Both B and V are transformed from F475W. Note (3): Types are: EB = eclipsing binary (1 objects in AndI; 2 objects in AndII) GSS RRL = 5 objects in AndI M31 RRL = 1 object in AndIII; 1 object in AndXVI RRL? = 2 objects in AndXXVIII RRab = 229 objects in AndI; 187 objects in AndII; 84 objects in AndIII; 80 objects in AndXV; 3 objects in AndXVI; 35 objects in AndXXVIII RRc = 48 objects in AndI; 48 objects in AndII; 15 objects in AndIII; 24 objects in AndXV; 5 objects in AndXVI; 35 objects in AndXXVIII RRd = 19 objects in AndI; 16 objects in AndII; 12 objects in AndIII; 13 objects in AndXV; 15 objects in AndXXVIII AC = Anomalous Cepheids (4 objects in AndII; 4 objects in AndIII; 4 objects in AndXV; 3 objects in AndXXVIII)
History: From electronic version of the journal References: Monelli et al. Paper I. 2016ApJ...819..147M Skillman et al. Paper II. 2017ApJ...837..102S Martinez-Vazquez et al. Paper III. 2017ApJ...850..137M This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jun-2018
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