2020A&A...641A..71L


Query : 2020A&A...641A..71L

2020A&A...641A..71L - Astronomy and Astrophysics, volume 641A, 71-71 (2020/9-1)

Atmospheric parameters of Cepheids from flux ratios with ATHOS. I. The temperature scale.

LEMASLE B., HANKE M., STORM J., BONO G. and GREBEL E.K.

Abstract (from CDS):


Context. The effective temperature is a key parameter governing the properties of a star. For stellar chemistry, it has the strongest impact on the accuracy of the abundances derived. Since Cepheids are pulsating stars, determining their effective temperature is more complicated than in the case of nonvariable stars.
Aims. We want to provide a new temperature scale for classical Cepheids, with a high precision and full control of the systematics.
Methods. Using a data-driven machine learning technique employing observed spectra, and in taking great care to accurately phase single-epoch observations, we tied flux ratios to (label) temperatures derived using the infrared surface brightness method.
Results. We identified 143 flux ratios, which allow us to determine the effective temperature with a precision of a few Kelvin and an accuracy better than 150K, which is in line with the most accurate temperature measures available to date. The method does not require a normalization of the input spectra and provides homogeneous temperatures for low- and high-resolution spectra, even at the lowest signal-to-noise ratios. Due to the lack of a dataset with a sufficient sample size for Small Magellanic Cloud Cepheids, the temperature scale does not extend to Cepheids with [Fe/H]←0.6dex. However, it nevertheless provides an exquisite, homogeneous means of characterizing Galactic and Large Magellanic Cloud Cepheids .
Conclusions. The temperature scale will be extremely useful in the context of spectroscopic surveys for Milky Way archaeology with the WEAVE and 4MOST spectrographs. It paves the way for highly accurate and precise metallicity estimates, which will allow us to assess the possible metallicity dependence of Cepheids' period-luminosity relations and, in turn, to improve our measurement of the Hubble constant H0.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: variables: Cepheids - stars: fundamental parameters - techniques: spectroscopic - methods: data analysis

Simbad objects: 54

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Number of rows : 54
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SV* HV 1328 cC* 00 32 54.9172871016 -73 49 19.085722104   14.17 14.116   13.431 ~ 31 0
2 SV* HV 1333 cC* 00 36 03.4615743240 -73 55 58.867078620   15.87 14.702   13.820 ~ 24 0
3 SV* HV 1335 cC* 00 36 55.6921565160 -73 56 28.053638520   15.399 14.746   13.983 ~ 32 0
4 SV* HV 822 cC* 00 41 55.4776238040 -73 32 23.608342176   14.39 14.524   13.618 ~ 27 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10536 1
6 SV* HV 837 cC* 00 55 56.0568870768 -71 59 02.691309588   14.16 13.233   12.297 ~ 61 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6562 1
8 SV* HV 12452 cC* 04 48 51.3419874096 -69 21 22.760929404   15.53 14.755 14.40 13.941 ~ 32 0
9 SV* HV 877 cC* 04 57 01.7944309968 -67 59 42.589297284   14.10 13.363   12.232 ~ 51 0
10 SV* HV 879 cC* 04 58 05.5960382376 -69 27 15.480133020   14.72 13.457 13.01 12.299 ~ 58 0
11 SV* HV 2369 cC* 05 13 53.6706712704 -67 03 48.446510436 14.7 12.88 12.21   11.648 F5?I? 66 0
12 SV* HV 2405 cC* 05 14 41.5551364872 -70 42 32.084016804   15.88 15.151 14.70 14.355 ~ 29 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16522 1
14 * bet Dor cC* 05 33 37.5159729864 -62 29 23.376457680 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 365 0
15 SV* HV 2827 cC* 05 43 47.3076015504 -66 35 08.943397872   13.37 12.02   11.220 M 57 0
16 SV* HV 1023 cC* 05 46 36.1848254832 -68 11 03.439255668   14.66 14.06 13.52 12.775 ~ 44 0
17 SV* HV 6093 cC* 05 57 46.8445419408 -68 41 04.285724352   15.96 15.304 15.02 14.628 ~ 29 0
18 V* T Mon cC* 06 25 12.9996760920 +07 05 08.558582892 8.24 7.20 5.98   4.996 G3Iabv+A0p 459 1
19 * 48 Aur cC* 06 28 34.0881845487 +30 29 34.929596860 6.73 6.23 5.55   4.777 F5.5-G0Ib 375 0
20 V* AD Gem cC* 06 43 07.5117403056 +20 56 20.799066228   10.42 9.80   9.044 F5 102 0
21 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 555 0
22 V* VZ Pup cC* 07 38 35.2380326136 -28 29 58.597431036   11.469 10.154 9.583   F7.5 141 1
23 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 338 0
24 V* V Car cC* 08 28 43.6940477208 -60 07 21.268842960   8.14 7.31   6.432 F8Ib/II 138 0
25 V* RZ Vel cC* 08 37 01.3028699904 -44 06 52.846248456   8.507 7.260     G1Ib 216 0
26 V* T Vel cC* 08 37 40.8266515248 -47 21 43.084440432   8.92 7.68   6.970 G0II 164 0
27 * l Car cC* 09 45 14.8117044917 -62 30 28.450312664   5.09 3.75     G5Iab/b 309 0
28 V* WZ Car cC* 10 55 18.7271183664 -60 56 23.951331672   10.40 9.37     F8 142 0
29 V* U Car cC* 10 57 48.1866744768 -59 43 55.883482140 8.31 7.21 6.11   5.073 G5/8Iab 224 0
30 V* S Mus cC* 12 12 47.0199008472 -70 09 06.439196664 7.58 8.80 8.33 7.39 5.196 F6Ib+B5V 251 0
31 V* V Cen cC* 14 32 33.0833481288 -56 53 15.774129600 8.44 7.84 6.93   5.798 F5Ib/II 261 0
32 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 363 1
33 V* KQ Sco cC* 16 51 38.5473559392 -45 25 36.101286516 12.37 10.69 9.31     K7 128 0
34 V* BF Oph cC* 17 06 05.4979834752 -26 34 50.029842576 8.00 7.61 6.93   6.377 G0II 211 0
35 V* X Sgr cC* 17 47 33.6239490288 -27 49 50.835778896 5.84 5.34 4.54 6.03 3.661 F7II 325 0
36 V* RY Sco cC* 17 50 52.3447976064 -33 42 20.412288432 9.77 8.79 7.51   6.256 F6Ib 182 0
37 V* Y Oph cC* 17 52 38.7019050072 -06 08 36.874071816 8.62 7.61 6.21     G3Ia 357 0
38 * gam01 Sgr cC* 18 05 01.2264355704 -29 34 48.322222356 5.99 5.47 4.69   3.869 G0Ib/II 340 0
39 V* WZ Sgr cC* 18 16 59.7160721616 -19 04 32.989734840   9.10 7.45     F7(III) 243 0
40 V* Y Sgr cC* 18 21 22.9862401944 -18 51 36.006450458 7.31 6.69 5.75   4.810 F8II 283 0
41 V* XX Sgr cC* 18 24 44.5009232352 -16 47 49.818126264   10.51 9.65 9.38   F7/8II 116 0
42 V* UZ Sct cC* 18 31 22.3668789696 -12 55 43.335648156   13.23 10.91   9.195 G0 83 0
43 V* U Sgr cC* 18 31 53.3323107600 -19 07 30.261459540 8.50 7.81 6.68   5.413 G1Ib 454 0
44 V* EV Sct cC* 18 36 39.6017483712 -08 11 05.361288684   10.99 9.90     G0II 242 0
45 V* RU Sct cC* 18 41 56.3818572048 -04 06 38.376404820   10.17 8.82     G5 194 0
46 V* Z Sct cC* 18 42 57.2738818992 -05 49 15.250864188   10.89 9.60   8.077 G0-M0 121 0
47 V* V350 Sgr cC* 18 45 17.4968424336 -20 38 50.552766852   8.321 7.450 8.41 6.421 F8Ib/II 211 0
48 V* BB Sgr cC* 18 50 59.8729954248 -20 17 42.829838520 8.07 7.53 6.69   5.824 G0Ib 246 0
49 V* FF Aql cC* 18 58 14.7483041520 +17 21 39.297557628 6.61 6.18 5.38     F6Ib 357 0
50 V* TT Aql cC* 19 08 13.7497129848 +01 17 55.147982640 8.96 7.86 6.50   5.699 G0/2Ib 274 0
51 V* U Aql cC* 19 29 21.3614645376 -07 02 38.662110240 8.41 7.71 6.61   5.270 F5I/II+B9.8V 276 0
52 * 10 Sge cC* 19 56 01.2628947456 +16 38 05.262056412 6.45 6.03 5.36 6.81 4.789 F7Ib 341 0
53 V* T Vul cC* 20 51 28.2383768376 +28 15 01.819622952 6.89 6.49 5.77   5.061 F5Ib+A0.8V 333 0
54 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 710 0

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2023.02.02-18:10:41

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