J/ApJ/894/135 INT monitoring of Local Group. I. Andromeda I (Saremi+, 2020)
The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies.
I. Survey overview and first results for Andromeda I.
Saremi E., Javadi A., Van Loon J.T., Khosroshahi H., Molaeinezhad A.,
McDonald I., Raouf M., Danesh A., Bamber J.R., Short P., Suarez-Andres L.,
Clavero R., Gozaliasl G.
<Astrophys. J., 894, 135-135 (2020)>
=2020ApJ...894..135S 2020ApJ...894..135S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby; Clusters, globular; Photometry, VRI; Surveys;
Abundances, [Fe/H]; Magnitudes, absolute
Keywords: Asymptotic giant branch stars; Local Group; Stellar mass loss
Stellar evolution; Luminosity function; Stellar mass functions
Stellar oscillations; Galaxy stellar content; Dwarf galaxies; Surveys
Long period variable stars; Galaxy distances
Abstract:
An optical monitoring survey in nearby dwarf galaxies was carried out
with the 2.5m Isaac Newton Telescope. Fifty-five dwarf galaxies and
four isolated globular clusters in the Local Group were observed with
the Wide Field Camera. The main aims of this survey are to identify
the most evolved asymptotic giant branch (AGB) stars and red
supergiants at the end-point of their evolution based on their
pulsational instability, use their distribution over luminosity to
reconstruct the star formation history, quantify the dust production
and mass loss from modeling the multiwavelength spectral energy
distributions (SEDs), and relate this to luminosity and radius
variations. In this first of a series of papers, we present the
methodology of the variability survey and describe the photometric
catalog of the Andromeda I (And I) dwarf galaxy as an example of the
survey, and we discuss the identified long period variable (LPV)
stars. We detected 5581 stars and identified 59 LPV candidates within
two half-light radii of the center of And I. The amplitudes of these
candidates range from 0.2 to 3mag in the i-band. Seventy-five percent
of detected sources and 98% of LPV candidates are detected at
mid-infrared wavelengths. We show evidence for the presence of
dust-producing AGB stars in this galaxy including five extreme AGB
(x-AGB) stars, and we model some of their SEDs. A distance modulus of
24.41mag for And I was determined based on the tip of the red giant
branch. Also, a half-light radius of 3.2'±0.3' was calculated.
Description:
Over a period of three years (2015 June to 2018 February), we used the
Wide Field Camera (WFC) to survey the majority of dwarf galaxies in
the Local Group (LG). The WFC is an optical mosaic camera at the 2.5m
INT of the Observatorio del Roque de los Muchachos (La Palma). Our
sample includes 43 dSph, six dIrr, six dTrans, and four globular
clusters (GCs) all visible in the Northern Hemisphere.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 126 59 Observational properties of targets
table2.dat 42 566 Log of WFC observations of each fields
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/AJ/126/2840 : BVI CCD photometry of Sextans dSph galaxy (Lee+, 2003)
J/ApJ/697/1993 : Spitzer study of AGB stars. III. (Boyer+, 2009)
J/MNRAS/411/263 : JHK variable stars in M33 (Javadi+ 2011)
J/ApJ/758/11 : Bayesian distances to M31 satellites (Conn+, 2012)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/753/71 : Mass-loss return from LMC evolved stars. VI. (Riebel+, 2012)
J/ApJ/754/35 : Red supergiant stars in the SMC. II. (Yang+, 2012)
J/AJ/145/22 : Simultaneous SiO and H2O maser observations (Kim+, 2013)
J/ApJS/216/10 : DUSTiNGS. I. The Good Source Catalog (Boyer+, 2015)
J/ApJ/800/51 : DUSTiNGS II. Metal-poor dusty AGB stars (Boyer+, 2015)
J/ApJ/812/158 : Leo P RR Lyrae candidates & cumulative SFH (McQuinn+, 2015)
J/ApJ/833/167 : PAndAS view of Andromeda satellites. II. (Martin+, 2016)
J/ApJ/850/137 : ISLAndS project. III. Var. stars (Martinez-Vazquez+, 2017)
J/AJ/156/112 : NIR Mira period-luminosity relations in M33 (Yuan+, 2018)
J/ApJ/877/49 : DUSTiNGS. V. 3.6 and 4.5um light curves (Goldman+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Set Type of target (1)
5- 14 A10 --- Name Name of the source
16- 17 I2 h RAh Hour of right ascension (J2000)
19- 20 I2 min RAm Minute of right ascension (J2000)
22- 25 F4.1 s RAs Second of right ascension (J2000)
27 A1 --- DE- Sign of declination (J2000)
28- 29 I2 deg DEd Degree of declination (J2000)
31- 32 I2 arcmin DEm Arcminute of declination (J2000)
34- 35 I2 arcsec DEs Arcsecond of declination (J2000)
37- 42 F6.2 mag VMag [-16.5/-0] Absolute V-band magnitude
44- 47 F4.2 mag e_VMag [0.1/1.3]? VMag (lower) uncertainty
49- 52 F4.2 mag E_VMag [0.17/1.1]? VMag upper uncertainty
54- 58 F5.2 --- rh [0.4/16]? Calculated half-light radius rh (2)
60- 63 F4.2 --- e_rh [0.03/1.7]? Rh (lower) uncertainty
65- 68 F4.2 --- E_rh [0.14/1.8]? Rh upper uncertainty
70- 73 F4.2 --- ell [0/0.8]? Ellipticity 1-b/a where b is the
semiminor axis and a is the semimajor axis
75- 78 F4.2 --- e_ell [0.01/0.21]? Ell uncertainty
80- 84 F5.2 mag m-M [16.1/26.19] Calculated distance modulus
86- 89 F4.2 mag e_m-M [0.03/0.5]? m-M (lower) uncertainty
91- 94 F4.2 mag E_m-M [0.07/0.74]? m-M upper uncertainty
96- 104 F9.5 Msun Mass [0.00034/330]? Mass
106- 110 F5.2 Sun [Fe/H] [-2.72/-0.25] Metallicity
112- 115 F4.2 Sun e_[Fe/H] [0.01/0.4]? [Fe/H] (lower) uncertainty
117- 119 F3.1 Sun E_[Fe/H] [0.1/0.1]? [Fe/H] upper uncertainty
121- 126 A6 --- Type Source type (3)
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Note (1): Target as follows:
And = Dwarf galaxies of Andromeda (24 targets)
MW = Dwarf galaxies of the Milky Way (21 targets)
Iso = Isolated dwarf galaxies (10 targets)
GC = Globular Clusters (4 targets)
Note (2): The half-light radius (rh) is the distance along the semimajor
axis that contains half the light of the galaxy.
Note (3): Type as follows:
GC = Globular Cluster (4 occurrences)
dE = (2 occurrences)
dIrr = dwarf irregular galaxy (6 occurrences)
dSph = dwarf spheroidal galaxy (40 occurrences)
dSph? = dwarf spheroidal candidate (1 occurrence)
dTrans = transition (dIrr/dSph) galaxy (6 occurrences)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Galaxy identifier
12- 15 I4 yr Obs.Y [2015/2018] Year of the observation
17- 18 I2 "month" Obs.M Month of the observation
20- 21 I2 d Obs.D Day of the observation
23- 24 I2 --- Epoch Epoch
26 A1 --- Filt Filter used (V, I or i)
28- 31 I4 s Exp [15/3180] Exposure time
33- 37 F5.3 --- Air [1/2.83] Airmass
39- 42 F4.2 arcsec Seeing [0.76/4] Seeing
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History:
From electronic version of the journal
References:
Navabi et al. Paper IV. 2021ApJ...910..127N 2021ApJ...910..127N
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Sep-2021