J/A+A/622/A60 Gaia DR2 misclassified RR Lyrae list (Clementini+, 2019)
Gaia Data Release 2. Specific characterisation and validation of all-sky
Cepheids and RR Lyrae stars.
Clementini G., Ripepi V., Molinaro R., Garofalo A., Muraveva T.,
Rimoldini L., Guy L. P., Jevardat de Fombelle G., Nienartowicz K.,
Marchal O., Audard M., Holl B., Leccia S., Marconi M., Musella I.,
Mowlavi N., Lecoeur-Taibi I., Eyer L., De Ridder J., Regibo S.,
Sarro L.M., Szabados L., Evans D.W., Riello M.
<Astron. Astrophys. 622, A60 (2019)>
=2019A&A...622A..60C 2019A&A...622A..60C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable
Keywords: star: general - stars: oscillations - stars: variables: Cepheids -
stars: variables: RR Lyrae - methods: data analysis -
Magellanic Clouds
Abstract:
The Gaia second Data Release (DR2) presents a first mapping of
full-sky RR Lyrae stars and Cepheids observed by the spacecraft during
the initial 22 months of science operations.
The Specific Object Study (SOS) pipeline, developed to validate and
fully characterise Cepheids and RR Lyrae stars (SOS Cep&RRL) observed
by Gaia, has been presented in the documentation and papers
accompanying the Gaia first Data Release. Here we describe how the SOS
pipeline was modified to allow for processing the Gaia multi-band (G,
GBP, and GRP) time-series photometry of all-sky candidate variables
and produce specific results for confirmed RR Lyrae stars and Cepheids
that are published in the DR2 catalogue.
The SOS Cep&RRL processing uses tools such as the period-amplitude and
the period-luminosity relations in the G band. For the analysis of the
Gaia DR2 candidates we also used tools based on the GBP and GRP
photometry, such as the period-Wesenheit relation in (G,GRP).
Multi-band time-series photometry and characterisation by the SOS
Cep&RRL pipeline are published in Gaia DR2 for 150359 such variables
(9575 classified as Cepheids and 140784 as RR Lyrae stars)
distributed throughout the sky. The sample includes variables in 87
globular clusters and 14 dwarf galaxies (the Magellanic Clouds, 5
classical and 7 ultra-faint dwarfs). To the best of our knowledge, as
of 25 April 2018, variability of 50570 of these sources (350 Cepheids
and 50,220 RR Lyrae stars) has not been reported before in the
literature, therefore they are likely new discoveries by Gaia.
An estimate of the interstellar absorption is published for 54272
fundamental-mode RR Lyrae stars from a relation based on the G-band
amplitude and the pulsation period. Metallicities derived from the
Fourier parameters of the light curves are also released for 64,932 RR
Lyrae stars and 3,738 fundamental-mode classical Cepheids with period
shorter than 6.3 days.
Description:
List of sources likely misclassified as RR Lyrae stars
(courtesy of S. Cheng, S. Koposov and H-C. Hwang).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 47 983 Gaia DR2 identification number
for 983 sources misclassified as RR Lyrae stars
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- Source Gaia DR2 identification number (source_id)
22- 47 A26 --- Note Note
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Acknowledgements:
Gisella Clementini, gisella.clementini(at)inaf.it
(End) G. Clementini [INAF-OAS Bologna, Italy], P. Vannier [CDS] 29-Nov-2018