2018A&A...618A.160L

Query : 2018A&A...618A.160L

2018A&A...618A.160L - Astronomy and Astrophysics, volume 618A160-160 (2018/1-0)

Milky Way metallicity gradient from Gaia DR2 F/1O double-mode Cepheids.

LEMASLE B., HAJDU G., KOVTYUKH V., INNO L., GREBEL E.K., CATELAN M., BONO G., FRANCOIS P., KNIAZEV A., DA SILVA R. and STORM J.

Abstract (from CDS):

Context. The ratio of the first overtone (1O)/fundamental (F) periods of mixed-mode Cepheids that pulsate simultaneously in these two modes (F/1O) is metallicity-dependent. It can therefore be used to characterize the systems that host such variable stars.
Aims. We want to take advantage of the F/1O double-mode Cepheids listed in the Gaia Data Release 2 (DR2) catalog to derive the metallicity gradient in the Milky Way disk.
Methods. The metallicity is derived from the ratio of the first overtone and fundamental periods provided by Gaia DR2 while the Gaia DR2 parallaxes are used to determine the Galactocentric distances of the stars.
Results. From a visual inspection of the light curves, it turns out that a large fraction (77%) of the Galactic F/1O double-mode Cepheids in Gaia DR2 are spurious detections. Gaia DR2 provides three new bona fide F/1O Cepheids. Combining them with the currently known F/1O Cepheids and using the Gaia DR2 parallaxes for the entire sample, we can derive the metallicity gradient in the Milky Way disk. We find a slope of -0.045±0.007dex/kpc using a bootstrap method, and of -0.040±0.002dex/kpc using a total least squares method. These results are in good agreement with previous determinations of the [Fe/H] gradient in the disk based on canonical Cepheids.
Conclusions. The period ratio of F/1O Cepheids allows for a reliable determination of the metallicity gradient in the Milky Way, and in turn, in other systems that would be difficult to reach via classical spectroscopic methods.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: abundances - stars: distances - stars: variables: Cepheids - Galaxy: disk

Simbad objects: 66

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Number of rows : 66
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V363 Cas cC* 00 15 14.3334878928 +60 20 25.690341840   11.26 10.68     kF6hF7 65 0
2 V* V825 Cas cC* 00 25 18.1692599640 +60 45 53.202776472   14.1       ~ 13 0
3 V* AS Cas cC* 00 25 37.7350953840 +64 13 47.619419592     12.23     ~ 56 0
4 V* TU Cas cC* 00 26 19.4488112352 +51 16 49.292204088   8.507 7.835     F4 212 0
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
7 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
8 NSVS 1831231 cC* 02 15 31.4663240760 +63 31 04.011572064   11.83 10.789     ~ 10 0
9 V* V371 Per cC* 02 55 31.1849232456 +42 35 19.729034664   11.52 10.95     ~ 25 0
10 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
11 * bet Per SB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1265 1
12 V* V1384 Cas cC* 03 13 47.0118076848 +63 20 58.117384572   15.47 13.90 13.57   ~ 13 0
13 V* AC Cam cC* 03 23 47.8834711752 +59 21 20.417530464   14.14       ~ 42 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
15 V* CO Aur cC* 06 00 28.5064756848 +35 18 43.852562928   8.34 7.73     F5Ib 101 0
16 V* V901 Mon cC* 06 27 25.2521395704 +01 11 32.418314772   11.32 10.52     G0 11 1
17 1RXS J063656.7-052104 RS* 06 36 56.3355948552 -05 21 03.638627244   12.37 11.71   10.535 K7 13 0
18 V* DZ CMa cC* 07 16 59.3295055464 -15 18 25.436915604     11.960 11.61 10.71 G0 30 0
19 ASAS J072830-3039.3 cC* 07 28 29.7661988115 -30 39 19.993520693   12.88 12.24 12.15 11.445 ~ 17 0
20 V* VX Pup cC* 07 32 36.6489773592 -21 55 49.534161528   9.87 9.32 8.97   F3IV 147 0
21 V* BE Pup cC* 07 33 35.5028274936 -25 50 37.228061724     13.675   12.362 ~ 34 0
22 OGLE GD-CEP-1350 cC* 07 37 54.4948513416 -29 26 16.970902332     14.645   13.222 ~ 13 0
23 Gaia DR3 3036328405518444800 V* 07 55 51.4600869216 -12 01 43.079748888           ~ 3 0
24 ATO J119.7726-05.6955 RS* 07 59 05.4438329544 -05 41 43.998264888           ~ 6 0
25 OGLE GD-CEP-158 cC* 07 59 22.3168351704 -33 21 25.693947648     13.971   12.347 ~ 13 0
26 V* AX Vel cC* 08 10 49.3236457224 -47 41 54.828934332   8.78 8.16     F6II 127 0
27 V* AP Vel cC* 08 39 45.7557936912 -43 51 39.163001040   11.17 10.16     F9 106 0
28 Gaia DR3 5431347477101421824 V* 09 44 33.6410514768 -41 33 43.873610328           ~ 3 0
29 V* V701 Car cC* 10 09 13.6141771968 -57 14 33.360686628   12.39 11.10 10.64   ~ 23 0
30 V* GZ Car cC* 10 20 20.3716366488 -59 22 35.834822616   11.15 10.20     G5 102 0
31 V* Y Car cC* 10 33 10.8500390952 -58 29 55.095062136   8.75 8.16     F0/3 152 0
32 V* EY Car cC* 10 42 23.0317207392 -61 09 57.295281744   11.05 10.35     ~ 83 0
33 OGLE GD-CEP-9 cC* 10 58 58.4272470912 -61 52 18.327537588     17.780   15.513 ~ 8 0
34 OGLE GD-CEP-12 cC* 11 04 58.7093340816 -62 01 52.407877260     16.577   14.773 ~ 9 0
35 V* V1048 Cen cC* 11 28 42.6634698048 -59 25 43.337724744   11.09 10.50   9.57 F8 34 0
36 Gaia DR3 5369956245371775104 cC* 11 36 10.1239183968 -50 06 20.976186852           ~ 3 0
37 V* UZ Cen cC* 11 40 58.5379283208 -62 41 32.933904396   9.60 8.30   7.909 F3Ib/II 130 0
38 V* BK Cen cC* 11 49 16.0153669440 -63 04 42.905812404   11.04 10.19     G5 105 0
39 OGLE GD-CEP-16 cC* 13 22 55.0531026192 -65 00 03.595684212     16.513   14.775 ~ 8 0
40 OGLE GD2000.13.00074 cC* 13 27 58.5458264760 -67 25 01.528758048     14.857   13.900 ~ 7 0
41 CD-37 9248 LP* 14 13 56.3523462120 -38 05 46.631939280   10.23 9.59 9.54   G8 41 1
42 V* XX Vir WV* 14 16 48.5934410448 -06 17 15.064681488   12.38 11.65     F6 68 0
43 Gaia DR3 5895841249526120064 Ce* 14 23 17.3587064232 -54 57 35.374799880           ~ 3 0
44 V* V1210 Cen cC* 14 36 55.5558787272 -58 15 41.219542908   11.29 10.27     ~ 27 0
45 [PKK2020] 1007 Pe* 15 06 01.9977313704 +67 28 28.638863868           ~ 4 0
46 CRTS J155623.7-111836 EB* 15 56 23.7584520000 -11 18 36.740489544     14.63     ~ 4 0
47 V* U TrA cC* 16 07 19.0044671808 -62 54 38.018675304   8.43 7.89     F8Ib/II 149 0
48 ATO J265.4641+16.8317 EB* 17 41 51.4047585240 +16 49 54.281673732           ~ 5 0
49 OGLE BLG-CEP-3 cC* 17 44 43.7940418728 -23 43 25.208360940     18.207   16.390 ~ 11 0
50 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
51 V* V767 Sgr cC* 17 52 28.4108897568 -26 42 12.493247868     12.54   10.748 ~ 15 0
52 OGLE BLG-CEP-21 cC* 17 57 50.3681406360 -28 04 43.301673912     19.448   16.841 ~ 9 0
53 V* BL Her WV* 18 01 09.2240599584 +19 14 56.696475012   10.54 9.70     F0 182 0
54 ZTF J181047.39+231425.5 EB* 18 10 47.3905380576 +23 14 25.643826708           ~ 5 0
55 V* V725 Sgr LP* 18 11 59.4391917456 -36 06 40.335553692           ~ 16 0
56 V* V458 Sct cC* 18 22 27.0663763008 -10 07 29.181954072   10.74 9.81     ~ 33 0
57 V* V367 Sct cC* 18 33 35.2353033192 -10 25 38.126250552   13.34 11.580     F7Ib 187 0
58 V* BQ Ser cC* 18 36 15.9375844368 +04 23 53.693400840   10.49 9.21     F5III 114 0
59 V* EW Sct cC* 18 37 51.1112159832 -06 47 48.494842332   9.50 7.96     F8Ib/II 117 0
60 V* V493 Aql cC* 18 57 24.2673580152 -00 43 48.823487076   12.18 11.01 10.63   ~ 60 0
61 CRTS J185900.5-462532 RR* 18 59 00.3051135072 -46 25 29.006963184     16.10     ~ 6 0
62 [SHM2017] J300.67700-03.60956 cC* 20 02 42.4711629888 -03 36 34.363681560       14.346   ~ 8 0
63 ATO J301.5620+20.7362 RR* 20 06 14.8936518936 +20 44 10.333175172           ~ 7 0
64 ZTF J200902.33+154608.2 EB* 20 09 02.3391130128 +15 46 08.363590896           ~ 5 0
65 V* V1533 Cyg cC* 20 51 27.8795224368 +46 18 12.732358104           ~ 17 0
66 ASASSN-V J031346.98+632052.8 V* 22 49 32.7973919328 -61 52 23.603879712           ~ 3 0

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