J/ApJ/858/11 The NIR tip of RGB. I. JHK photometry of IC1613 (Madore+, 2018)
The near-infrared tip of the red giant branch.
I. A calibration in the isolated dwarf galaxy IC 1613.
Madore B.F., Freedman W.L., Hatt D., Hoyt T.J., Monson A.J., Beaton R.L.,
Rich J.A., Jang In S., Lee M.G., Scowcroft V., Seibert M.
<Astrophys. J., 858, 11 (2018)>
=2018ApJ...858...11M 2018ApJ...858...11M
ADC_Keywords: Galaxies, nearby; Photometry, infrared; Stars, giant
Keywords: distance scale; galaxies: distances and redshifts;
galaxies: stellar content; infrared: stars; Magellanic Clouds;
stars: Population II
Abstract:
Based on observations from the FourStar near-infrared camera on the
6.5m Baade-Magellan telescope at Las Campanas, Chile, we present
calibrations of the JHK luminosities of stars defining the tip of the
red giant branch (TRGB) in the halo of the Local Group dwarf galaxy
IC1613. We employ metallicity- independent (rectified) T-band
magnitudes-constructed using J-, H-, and K-band magnitudes and both
(J-H) and (J-K) colors to flatten the upward-sloping red giant branch
tips as otherwise seen in their apparent color-magnitude diagrams. We
describe and quantify the advantages of working at these particular
near-infrared wavelengths, which are applicable to both the Hubble
Space Telescope (HST) and the James Webb Space Telescope (JWST). We
also note that these same wavelengths can be accessed from the ground
for an eventual tie-in to Gaia for absolute astrometry and parallaxes
to calibrate the intrinsic luminosity of the TRGB. Adopting the color
terms derived from the IC 1613 data, as well as the zero points from a
companion study of the Large Magellanic Cloud, whose distance is
anchored to the geometric distances of detached eclipsing binaries, we
find a true distance modulus of 24.32±0.02 (statistical) ±0.05mag
(systematic) for IC 1613, which compares favorably with the recently
published multi-wavelength, multi-method consensus modulus of
24.30±0.05mag by Hatt et al. (2017, J/ApJ/845/146).
Description:
The near-infrared JHK imaging data sets used here are described in
detail in Scowcroft+ (2013ApJ...773..106S 2013ApJ...773..106S). IC 1613 was observed on
three nights using the recently commissioned FourStar wide-field,
near-infrared camera on the Magellan Baade 6.5m telescope at Las
Campanas on 2011 Sep 9, Oct 4 and Nov 3.
Here, we note that the FourStar imager has a field of view of
10.8'x10.8' and a resolution of 0.159/pixel, and that the observations
were centered on the main body of IC 1613 so as to optimize detection
of Population I (disk) Cepheids.
Of particular interest in the context of this paper is the S/N
obtained at the level of the tip of the red giant branch (TRGB). These
values range from 70:1 (±0.014mag) in the K-band, to 120:1 (±0.009mag)
in the H-band 130:1 (±0.008mag) in the J-band.
Objects:
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RA (ICRS) DE Designation(s)
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01 04 54.2 +02 08 00 IC 1613 = MCG+00-03-070
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 23544 Near-infrared JHK photometry of stars in IC 1613
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See also:
J/A+AS/141/371 : Low-mass stars evolutionary tracks (Girardi+, 2000)
J/AJ/128/2239 : JHKs photometry of 92 LMC Cepheids (Persson+, 2004)
J/A+A/467/1025 : JHK of Fornax red giant branch (Gullieuszik+, 2007)
J/MNRAS/394/795 : AGB stars in Fornax dsph galaxy (Whitelock+, 2009)
J/ApJ/743/76 : Spitzer photometry of LMC Cepheids (Scowcroft+, 2011)
J/MNRAS/452/910 : IC 1613 asymptotic giant branch variables (Menzies+, 2015)
J/A+A/573/A84 : JHK photometry of IC 1613 AGB stars (Sibbons+, 2015)
J/A+A/578/A51 : Near-IR photometry of AGB stars in IC 1613 (Chun+, 2015)
J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)
J/ApJ/845/146 : Carnegie-Chicago Hubble Program. II. IC 1613 (Hatt+, 2017)
J/AJ/153/96 : Standard Galactic field RR Lyrae. I. Phot. (Monson+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [4/5001968] Identifier
9- 10 I2 h RAh [1] Hour of Right Ascension (J2000)
12- 13 I2 min RAm [4/5] Minute of Right Ascension (J2000)
15- 19 F5.2 s RAs Second of Right Ascension (J2000)
21 A1 --- DE- [+] Sign of the Declination (J2000)
22- 23 I2 deg DEd [2] Degree of Declination (J2000)
25- 26 I2 arcmin DEm [1/12] Arcminute of Declination (J2000)
28- 32 F5.2 arcsec DEs Arcsecond of Declination (J2000)
34- 38 F5.2 mag Jmag [13.9/23] LCO/FourStar J band magnitude
40- 43 F4.2 mag e_Jmag [0/0.4] The 1σ error in Jmag
45- 49 F5.2 mag Hmag [13.4/22.3] LCO/FourStar H band magnitude
51- 54 F4.2 mag e_Hmag [0/0.6] The 1σ error in Hmag
56- 60 F5.2 mag Kmag [13/22] LCO/FourStar Ks band magnitude
62- 65 F4.2 mag e_Kmag [0/0.6] The 1σ error in Kmag
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History:
From electronic version of the journal
References:
Hoyt et al. Paper II. 2018ApJ...858...12H 2018ApJ...858...12H
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Mar-2019