2018A&A...620A.127M


Query : 2018A&A...620A.127M

2018A&A...620A.127M - Astronomy and Astrophysics, volume 620A, 127-127 (2018/12-1)

Gaia Data Release 2. Validating the classification of RR Lyrae and Cepheid variables with the Kepler and K2 missions.

MOLNAR L., PLACHY E., JUHASZ A.L. and RIMOLDINI L.

Abstract (from CDS):


Context. The second data release of the Gaia mission (DR2) includes an advance catalogue of variable stars. The classifications of these stars are based on sparse photometry from the first 22 months of the mission.
Aims. We set out to investigate the purity and completeness of the all-sky Gaia classification results with the help of the continuous light curves of the observed targets from the Kepler and K2 missions, focusing specifically on RR Lyrae and Cepheid pulsators, outside the Galactic bulge region.
Methods. We cross-matched the Gaia identifications with the observations collected by the Kepler space telescope. We inspected the light curves visually, then calculated the relative Fourier coefficients and period ratios for the single- and double-mode K2 RR Lyrae stars to further classify them.
Results. We identified 1443 and 41 stars classified as RR Lyrae or Cepheid variables in Gaia DR2 in the targeted observations of the two missions and 263 more RR Lyre targets in the full-frame images (FFI) of the original mission. We provide the cross-match of these sources. We conclude that the RR Lyrae catalogue has a completeness between 70-78%, and provide a purity estimate of between 92 and 98% (targeted observations) with lower limits of 75% (FFI stars) and 51% (K2 worst-case scenario). The low number of Cepheids prevents us from drawing detailed conclusions, but the purity of the DR2 sample is estimated to be about 66%.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: variables: general - stars: variables: RR Lyrae - stars: variables: Cepheids

VizieR on-line data: <Available at CDS (J/A+A/620/A127): tablea1.dat-tablea9.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 41

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Number of rows : 41
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 758 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6285 1
3 V* SZ Tau cC* 04 37 14.7776556504 +18 32 34.926940860 7.65 7.13 6.37     F6.7:Ib 297 0
4 V* VZ Tau WV* 05 05 14.2594681920 +21 45 48.918218940   12.74 12.16 12.32   M4 8 0
5 V* RZ Gem cC* 06 02 36.5871685272 +22 14 02.948725104   10.83 9.91 9.68 8.679 F5 116 0
6 V* SS Gem RV* 06 08 35.1092051400 +22 37 01.988942124 10.42 9.71 8.67     G2/5I 67 0
7 V* V371 Gem cC* 06 10 19.3565850216 +24 01 15.084059916   11.61 10.74 10.5315   K0 16 0
8 V* AD Gem cC* 06 43 07.5117403056 +20 56 20.799066228   10.42 9.80   9.044 F5 102 0
9 NAME Leo IV Dwarf Galaxy G 11 32 57.0 -00 32 00     15.1     ~ 351 1
10 [DCD2013] CSS J134312.2-133520 RR* 13 43 12.2730502896 -13 35 20.832891936     15.37     ~ 6 0
11 V* KT Sco WV* 16 11 14.8985925528 -16 51 40.145622732     12.48     ~ 10 0
12 V* ET Oph RV* 17 01 08.6453166024 -26 35 42.345690432   12.45 11.65 11.39   ~ 9 1
13 V* FZ Oph V* 17 03 35.9229733080 -27 41 42.764350020           ~ 1 0
14 V* BF Oph cC* 17 06 05.4979834752 -26 34 50.029842576 8.00 7.61 6.93   6.377 G0II 211 0
15 V* IO Oph V* 17 08 42.8815423056 -25 09 49.391617392           ~ 3 0
16 V* V1637 Oph cC* 17 13 35.1200484672 -18 05 51.529646580   14.927 14.443 14.672   ~ 11 0
17 V* BL Her WV* 18 01 09.2240599584 +19 14 56.696475012   10.54 9.70     F0 164 0
18 * 12 Sgr cC* 18 13 02.4957687048 -23 07 02.201380968 8.06 7.48 6.59   6.057 F7/8Ib/II 184 0
19 V* V1954 Sgr cC* 18 15 26.2656380856 -20 37 46.353608400   12.28 10.83     K 37 0
20 V* V1185 Sgr WV* 18 19 45.7966752096 -27 09 33.154121988         11.535 ~ 14 0
21 V* V5567 Sgr cC* 18 21 05.5351982232 -18 27 19.732589280   11.93 10.69 9.749 9.12 ~ 11 0
22 V* AY Sgr cC* 18 23 19.1498783496 -18 34 29.188062012   11.99 10.49 9.62 9.052 F6 80 0
23 V* XX Sgr cC* 18 24 44.5009232352 -16 47 49.818126264   10.51 9.65 9.38   F7/8II 115 0
24 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 602 0
25 V* V377 Sgr WV* 18 48 09.7931677200 -20 07 35.615992404   13.72       ~ 19 0
26 V* V4061 Sgr Ce* 18 56 17.5359896016 -27 31 25.605096204   9.376 9.221 10.94 9.59 ~ 10 0
27 V* V839 Sgr WV* 18 59 37.2376322136 -23 21 52.285431384   14.99       ~ 21 0
28 V* V410 Sgr cC* 19 06 03.1381410720 -18 25 41.657235060           F6 17 0
29 V* V1077 Sgr WV* 19 06 26.9466887376 -19 36 35.280810252   13.00 12.62 13.32   ~ 12 0
30 V* V677 Lyr LP* 19 15 12.1372704744 +39 42 50.490059760   10.75 10.13   10.441 F2IIe 23 0
31 V* V527 Sgr WV* 19 16 10.9915384632 -20 55 55.829175132   14.90       ~ 26 0
32 V* HP Lyr pA* 19 21 39.0673459320 +39 56 08.202817716   11.12 10.38 10.15 9.615 A3Ia/Iab 55 1
33 V* RR Lyr RR* 19 25 27.9129605304 +42 47 03.693258204   7.36   7.6   kA3hF0 893 0
34 ASAS J193435-1921.7 WV* 19 34 34.6715899728 -19 21 39.991071024   13.09 12.76 12.55   ~ 5 0
35 V* V1154 Cyg cC* 19 48 15.4661680536 +43 07 36.960514968   9.92 9.14   8.120 G0 91 0
36 V* DF Cyg RV* 19 48 53.9450982768 +43 02 14.539346592   12.19 10.80   10.484 G6/7Ib/IIa 44 0
37 V* V783 Cyg RR* 19 52 52.7373773616 +40 47 35.480927868       14.70   ~ 30 0
38 Kepler-48 Ro* 19 56 33.4161659688 +40 56 56.496876216           K0V 88 1
39 2MASS J22245897-1012347 RR* 22 24 58.9677702288 -10 12 34.706218536   15.259 15.20     ~ 9 0
40 V* BC Aqr LP* 22 31 30.0985371000 -18 04 13.019938392   14.60       ~ 6 0
41 NAME Galactic Bulge reg ~ ~           ~ 3848 0

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2022.05.27-02:04:34

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