J/AJ/167/42 SEGUE II-V1 and UMaII-V1 light curves (Ngeow+, 2024)
Photometric Metallicity and Distance for the Two RR Lyrae in Segue II and
Ursa Major II Dwarf Galaxies Based on Multiband Light Curves.
Ngeow C.-C., Bhardwaj A.
<Astron. J., 167, 42 (2024)>
=2024AJ....167...42N 2024AJ....167...42N
ADC_Keywords: Stars, variable; Photometry, VRI
Keywords: Stellar distance ; Metallicity ; Dwarf galaxies ; RR Lyrae
variable stars
Abstract:
Multiband light curves of two RR-Lyrae variables in SegueII and
Ursa-MajorII ultrafaint dwarf galaxies were collected from near
simultaneous observations using the Lulin One-meter Telescope in Vgri
bands. Together with Gaia G-band light curves, we determined
photometric metallicities using empirical relations involving
pulsation period and Fourier parameter as dependent parameters. We
demonstrated that the RR-Lyrae photometric metallicity can be
determined accurately when these empirical relations were employed at
multiple wavelengths, which can potentially improve the distance
determination based on RR-Lyrae stars. The photometric metallicities
based on our approach were found to be -2.27±0.13dex and
-1.87±0.16dex for the RR-Lyrae in SegueII and Ursa-MajorII UFD,
respectively, with corresponding distance moduli of 17.69±0.15 mag
and 17.58±0.15 mag, in agreement with previous literature
determinations. This approach of photometric metallicity of RR Lyrae
based on multiband optical light curves will be particularly relevant
for distance measurements in the era of the Vera C Rubin's Legacy
Survey of Space and Time.
Description:
Objects:
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RA (2000) DE Designation(s)
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02 19 00.06 +20 06 35.2 SEGUE II-V1 = SDSS J021900.06+200635.2
08 50 37.53 +63 10 08.7 UMaII-V1 = SDSS J085037.53+631008.6
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 33 487 Light curves for SEGUE II-V1
table2.dat 33 590 Light curves for UMaII-V1
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
J/MNRAS/397/1748 : Spectroscopic study of Segue 2 (Belokurov+, 2009)
J/MNRAS/415/1366 : OGLE RR Lyrae in SMC (Kapakos+, 2011)
J/ApJ/752/42 : BV time series in Ursa Major II (Dall'Ora+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)
J/A+A/590/A9 : RGB stars in Galactic GC stellar parameters (Dias+, 2016)
J/ApJ/908/20 : On use of RR Lyrae as galactic probes. II. (Crestani+, 2021)
J/ApJ/920/33 : Fe/H estim 104 RR Lyrae from I- light curve (Dekany+, 2021)
J/ApJ/912/144 : Metal of Gal. RR Lyrae from opt. & IR LCs (Mullen+, 2021)
J/AJ/164/45 : grV light curve 30 RR-Lyrae into Kepler field (Ngeow, 2022)
J/A+A/674/A18 : Gaia DR3. The RR Lyrae sample (Clementini+, 2023)
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Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 d JD Julian Date of observation
20- 25 F6.3 mag mag Magnitude in Filter
27- 31 F5.3 mag e_mag Error in mag
33- 33 A1 -- Filt Filter used
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Apr-2024