2017A&A...608A..18G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET20:11:38

2017A&A...608A..18G - Astronomy and Astrophysics, volume 608A, 18-18 (2017/12-1)

Observational calibration of the projection factor of Cepheids. IV. Period-projection factor relation of Galactic and Magellanic Cloud Cepheids.

GALLENNE A., KERVELLA P., MERAND A., PIETRZYNSKI G., GIEREN W., NARDETTO N. and TRAHIN B.

Abstract (from CDS):

Context. The Baade-Wesselink (BW) method, which combines linear and angular diameter variations, is the most common method to determine the distances to pulsating stars. However, the projection factor, p-factor, used to convert radial velocities into pulsation velocities, is still poorly calibrated. This parameter is critical on the use of this technique, and often leads to 5-10% uncertainties on the derived distances.
Aims. We focus on empirically measuring the p-factor of a homogeneous sample of 29 LMC and 10 SMC Cepheids for which an accurate average distances were estimated from eclipsing binary systems.
Methods. We used the SPIPS algorithm, which is an implementation of the BW technique. Unlike other conventional methods, SPIPS combines all observables, i.e. radial velocities, multi-band photometry and interferometry into a consistent physical modelling to estimate the parameters of the stars. The large number and their redundancy insure its robustness and improves the statistical precision.
Results. We successfully estimated the p-factor of several Magellanic Cloud Cepheids. Combined with our previous Galactic results, we find the following P-p relation: -0.08±0.04(logP-1.18)+1.24±0.02. We find no evidence of a metallicity dependent p-factor. We also derive a new calibration of the period-radius relation, logR=0.684±0.007(logP-0.517)+1.489±0.002, with an intrinsic dispersion of 0.020. We detect an infrared excess for all stars at 3.6µm and 4.5µm, which might be the signature of circumstellar dust. We measure a mean offset of Δm3.6=0.057±0.006mag and Δm4.5=0.065±0.008mag.
Conclusions. We provide a new P-p relation based on a multi-wavelength fit that can be used for the distance scale calibration from the BW method. The dispersion is due to the LMC and SMC width we took into account because individual Cepheids distances are unknown. The new P-R relation has a small intrinsic dispersion: 4.5% in radius. This precision will allow us to accurately apply the BW method to nearby galaxies. Finally, the infrared excesses we detect again raise the issue of using mid-IR wavelengths to derive period-luminosity relation and to calibrate the Hubble constant. These IR excesses might be the signature of circumstellar dust, and are never taken into account when applying the BW method at those wavelengths. Our measured offsets may give an average bias of ∼2.8% on the distances derived through mid-IR P-L relations.

Abstract Copyright: © ESO, 2017

Journal keyword(s): techniques: photometric - techniques: radial velocities - stars: variables: Cepheids - stars: fundamental parameters - stars: fundamental parameters

Simbad objects: 47

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Number of rows : 47

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SV* HV 1328 cC* 00 32 54.9174261947 -73 49 19.086114742   14.17 14.116   13.431 ~ 30 0
2 SV* HV 1333 cC* 00 36 03.4614162922 -73 55 58.866210528   15.87 14.702   13.820 ~ 23 0
3 SV* HV 1335 cC* 00 36 55.6923398590 -73 56 28.055695177   15.399 14.746   13.983 ~ 31 0
4 SV* HV 1345 cC* 00 40 38.5968646914 -73 13 14.312423788   15.428 14.779   13.957 ~ 23 0
5 V* BZ Tuc s*y 00 41 43.4484060953 -73 43 23.886984060   13.42 12.09   10.911 G0Iab 68 0
6 SV* HV 822 cC* 00 41 55.4775921384 -73 32 23.609186717   14.39 14.524   13.618 ~ 27 0
7 OGLE SMC-CEP-921 s*y 00 46 53.1110749320 -72 42 51.737002042   12.67 12.04   11.421 G0Iab 59 0
8 SV* HV 829 cC* 00 50 28.7967644603 -72 45 09.212650923 12.97 12.26 11.63   11.017 G0Ib 78 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9710 1
10 SV* HV 11157 cC* 00 52 56.8085901275 -71 55 03.247041326   13.75 12.916   11.853 ~ 42 0
11 SV* HV 837 cC* 00 55 56.0569263828 -71 59 02.692782547   14.16 13.233   12.297 ~ 61 0
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5868 1
13 SV* HV 12717 cC* 04 43 20.8472580242 -69 13 47.811181001   15.48 14.733 14.20 13.950 ~ 26 0
14 OGLE LMC-CEP-79 cC* 04 47 06.8782178918 -69 17 39.491131004   15.02 14.116 13.62 13.114 ~ 13 1
15 SV* HV 12452 cC* 04 48 51.3419131055 -69 21 22.760708546   15.53 14.755 14.40 13.941 ~ 28 0
16 OGLE LMC-CEP-227 cC* 04 52 15.6982549282 -70 14 31.242341027     15.317   14.438 ~ 47 0
17 SV* HV 873 cC* 04 54 23.7766671988 -70 54 05.736569775   12.97 12.44 12.58 12.178 F8I 46 0
18 SV* HV 877 cC* 04 57 01.7945303401 -67 59 42.590749460   14.10 13.363   12.232 ~ 50 0
19 SV* HV 876 cC* 04 57 12.3634768644 -67 22 57.294407958   14.29 13.666 13.32 12.711 ~ 24 0
20 SV* HV 878 cC* 04 57 51.0484622567 -69 57 29.682156385   13.40 13.564 13.62 12.722 ~ 40 0
21 SV* HV 12505 cC* 04 57 56.7395086983 -68 48 57.612570508   16.99 14.847 14.75 13.808 ~ 19 0
22 SV* HV 879 cC* 04 58 05.5960529644 -69 27 15.481012522   14.72 13.356 13.01 12.341 ~ 53 0
23 HD 268878 cC* 04 58 10.7957486662 -69 56 58.783004889   13.83 13.02 12.96 12.071 K5 68 0
24 SV* HV 881 cC* 04 58 32.8021199081 -70 20 45.717120470   13.26 13.064 12.61 12.19 ~ 36 0
25 SV* HV 883 cC* 05 00 07.5646996952 -68 27 00.064482625 14.033 13.86 11.63 11.35 10.91 F8/G0Ia 73 0
26 SV* HV 2282 cC* 05 01 24.9394908748 -70 04 18.288809757   15.10 14.332 13.95 13.427 ~ 23 0
27 SV* HV 2338 cC* 05 06 08.8557525637 -71 15 26.119435535   12.83 12.26   11.858 ~ 60 0
28 HD 269075 cC* 05 06 47.9723051964 -70 02 13.297259550   13.30 12.48 12.77 11.842 M 63 0
29 SV* HV 899 cC* 05 07 07.8253500672 -68 53 19.453088959   13.50 13.343 12.83 12.449 ~ 51 0
30 SV* HV 909 cC* 05 09 20.1376380251 -70 27 27.043906162   13.32 12.67 12.11 11.949 ~ 61 0
31 SV* HV 5655 cC* 05 11 05.4172717803 -70 30 34.412175091   15.46 14.563 14.06 13.578 ~ 27 0
32 SV* HV 914 cC* 05 12 47.0348475429 -69 06 08.881909422     14.926   14.197 ~ 25 0
33 SV* HV 2369 cC* 05 13 53.6708479354 -67 03 48.447940301 14.7 12.88 12.21   11.648 F5?I? 63 0
34 SV* HV 2405 cC* 05 14 41.5552104934 -70 42 32.084769065   15.88 15.151 14.70 14.355 ~ 28 0
35 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15214 1
36 SV* HV 2527 cC* 05 25 39.1089344552 -71 06 39.848335076   15.49 14.615 14.16 13.670 ~ 34 0
37 SV* HV 2549 cC* 05 27 00.5741196389 -71 38 35.749590862   14.34 13.796 13.36 12.890 ~ 39 0
38 SV* HV 2538 cC* 05 27 07.7609332305 -68 29 42.908268981   15.32 14.475 14.05 13.468 ~ 21 0
39 SV* HV 1005 cC* 05 36 06.7992237500 -68 49 13.369825110   14.92 14.70 14.12 13.222 ~ 31 0
40 SV* HV 1006 cC* 05 37 22.4444907013 -69 28 59.372408599   15.23 14.398 13.91 13.478 ~ 21 0
41 SV* HV 2827 cC* 05 43 47.3080229900 -66 35 08.943172884   13.37 12.02   11.220 M 56 0
42 SV* HV 1023 cC* 05 46 36.1850662920 -68 11 03.440243508   14.66 14.06 13.52 12.775 ~ 41 0
43 OGLE LMC-CEP-4506 cC* 05 53 29.3579743272 -67 53 59.360079055     15.459   14.778 ~ 16 0
44 SV* HV 6093 cC* 05 57 46.8444050721 -68 41 04.284451547   15.96 15.304 15.02 14.628 ~ 28 0
45 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 295 1
46 V* FF Aql cC* 18 58 14.7482217777 +17 21 39.295590199 6.61 6.18 5.38     F6Ib 347 0
47 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 688 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-20:11:38

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