2021A&A...656A.102T


Query : 2021A&A...656A.102T

2021A&A...656A.102T - Astronomy and Astrophysics, volume 656A, 102-102 (2021/12-1)

Inspecting the Cepheid parallax of pulsation using Gaia EDR3 parallaxes. Projection factor and period-luminosity and period-radius relations.

TRAHIN B., BREUVAL L., KERVELLA P., MERAND A., NARDETTO N., GALLENNE A., HOCDE V. and GIEREN W.

Abstract (from CDS):


Context. As primary anchors of the distance scale, Cepheid stars play a crucial role in our understanding of the distance scale of the Universe because of their period-luminosity relation. Determining precise and consistent parameters (radius, temperature, color excess, and projection factor) of Cepheid pulsating stars is therefore very important.
Aims. With the high-precision parallaxes delivered by the early third Gaia data release (EDR3), we aim to derive various parameters of Cepheid stars in order to calibrate the period-luminosity and period-radius relations and to investigate the relation of period to p-factor.
Methods. We applied an implementation of the parallax-of-pulsation method through the algorithm called spectro-photo-interferometry of pulsating stars (SPIPS), which combines all types of available data for a variable star (multiband and multicolor photometry, radial velocity, effective temperature, and interferometry measurements) in a global modeling of its pulsation.
Results. We present the SPIPS modeling of a sample of 63 Galactic Cepheids. Adopting Gaia EDR3 parallaxes as an input associated with the best available dataset, we derive consistent values of parameters for these stars such as the radius, multiband apparent magnitudes, effective temperatures, color excesses, period changes, Fourier parameters, and the projection factor.
Conclusions. Using the best set of data and the most precise distances for Milky Way Cepheids, we derive new calibrations of the period-luminosity and period-radius relations: MKS = -5.529±0.015 - 3.141±0.050(log P - 0.9) and log R = 1.763±0.003 + 0.653±0.012(log P - 0.9). After investigating the dependences of the projection factor on the parameters of the stars, we find a high dispersion of its values and no evidence of its correlation with the period or with any other parameters such as radial velocity, temperature, or metallicity. Statistically, the p-factor has an average value of p = 1.26 ± 0.07, but with an unsatisfactory agreement (σ = 0.15). In absence of any clear correlation between the p-factor and other quantities, the best agreement is obtained under the assumption that the p-factor can take any value in a band with a width of 0.15. This result highlights the need for a further examination of the physics behind the p-factor.

Abstract Copyright: © B. Trahin et al. 2021

Journal keyword(s): stars: variables: Cepheids - stars: fundamental parameters - distance scale

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 - 2023
#notes
1 V* DL Cas cC* 00 29 58.5888773064 +60 12 43.065292140 10.66 9.88 8.63   7.582 G1Ib-IIHdel-1 319 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10530 1
3 V* AW Per cC* 04 47 46.3149227688 +36 43 22.033952832   8.46 7.51   6.200 F0+B6: 215 0
4 V* SY Aur cC* 05 12 39.2275921680 +42 49 54.411447432   9.97 9.05   7.851 F5III 123 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16507 1
6 * 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
7 V* ST Tau cC* 05 45 03.1603367712 +13 34 34.903715808   9.13 7.79   7.149 G0 125 0
8 V* T Mon cC* 06 25 12.9996760920 +07 05 08.558582892 8.24 7.20 5.98   4.996 G3Iabv+A0p 459 1
9 * 48 Aur cC* 06 28 34.0881845487 +30 29 34.929596860 6.73 6.23 5.55   4.777 F5.5-G0Ib 375 0
10 V* CV Mon cC* 06 37 04.8449178072 +03 03 50.274557532   11.32 9.90   8.631 ~ 231 0
11 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 555 0
12 V* X Pup cC* 07 32 47.0329137816 -20 54 34.884361152   9.56 8.46   7.143 K0 174 0
13 V* VZ Pup cC* 07 38 35.2380326136 -28 29 58.597431036   11.469 10.154 9.583   F7.5 141 1
14 V* AQ Pup cC* 07 58 22.0887499032 -29 07 48.338631084   9.70 8.54   7.175 F5-G2Ib 187 0
15 V* LS Pup cC* 07 58 59.2197041640 -29 18 28.358867700   11.75 10.59 9.88 8.933 ~ 89 0
16 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 338 0
17 V* RZ Vel cC* 08 37 01.3028699904 -44 06 52.846248456   8.507 7.260     G1Ib 216 0
18 * l Car cC* 09 45 14.8117044917 -62 30 28.450312664   5.09 3.75     G5Iab/b 309 0
19 V* VY Car cC* 10 44 32.6909254176 -57 33 55.327074480 8.12 7.70 6.87   6.299 F7Iab/b 212 0
20 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
21 V* KN Cen cC* 13 36 36.8950655064 -64 33 29.914949592   11.22 9.86     G8Iab+B6.0V 136 0
22 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 363 1
23 V* V636 Sco cC* 17 22 46.4815445448 -45 36 51.401229048   7.67 6.74   5.654 F7/8Ib/II 151 1
24 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
25 V* RY Sco cC* 17 50 52.3447976064 -33 42 20.412288432 9.77 8.79 7.51   6.256 F6Ib 182 0
26 * gam01 Sgr cC* 18 05 01.2264355704 -29 34 48.322222356 5.99 5.47 4.69   3.869 G0Ib/II 340 0
27 V* WZ Sgr cC* 18 16 59.7160721616 -19 04 32.989734840   9.10 7.45     F7(III) 243 0
28 V* Y Sgr cC* 18 21 22.9862401944 -18 51 36.006450458 7.31 6.69 5.75   4.810 F8II 283 0
29 V* XX Sgr cC* 18 24 44.5009232352 -16 47 49.818126264   10.51 9.65 9.38   F7/8II 116 0
30 V* U Sgr cC* 18 31 53.3323107600 -19 07 30.261459540 8.50 7.81 6.68   5.413 G1Ib 454 0
31 V* Z Sct cC* 18 42 57.2738818992 -05 49 15.250864188   10.89 9.60   8.077 G0-M0 121 0
32 V* SS Sct cC* 18 43 43.5111680040 -07 43 51.957172704   9.29 7.90   7.100 F8II 170 0
33 V* V350 Sgr cC* 18 45 17.4968424336 -20 38 50.552766852   8.321 7.450 8.41 6.421 F8Ib/II 211 0
34 V* BB Sgr cC* 18 50 59.8729954248 -20 17 42.829838520 8.07 7.53 6.69   5.824 G0Ib 246 0
35 V* SZ Aql cC* 19 04 39.4158230832 +01 18 22.158826524   9.92 7.92   7.039 F8/G0Ib 185 0
36 V* TT Aql cC* 19 08 13.7497129848 +01 17 55.147982640 8.96 7.86 6.50   5.699 G0/2Ib 274 0
37 V* FM Aql cC* 19 09 15.9900952128 +10 33 08.961371208 9.76 9.05 7.89   6.725 F2I 181 0
38 V* FN Aql cC* 19 12 47.3148920688 +03 33 26.703677448   9.58 7.96     F8/G0Iab/b 178 0
39 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
40 V* U Vul cC* 19 36 37.7293294920 +20 19 58.576725768   8.368 7.162   5.556 F8Iab 224 0
41 V* S Vul cC* 19 48 23.8063718736 +27 17 11.428754460   11.392 9.551 8.775   K0 186 0
42 V* SV Vul cC* 19 51 30.9059845128 +27 27 36.837672012 8.65 9.00 6.74   5.703 F8Ia 421 0
43 V* V1162 Aql cC* 19 52 20.9909317368 -11 22 00.754130100   8.73 7.81     G2Ib 84 0
44 * eta Aql cC* 19 52 28.3689223781 +01 00 20.371980515 5.12 4.61 3.80   3.030 F6Iab+B9.8V 656 0
45 * 10 Sge cC* 19 56 01.2628947456 +16 38 05.262056412 6.45 6.03 5.36 6.81 4.789 F7Ib 341 0
46 V* X Vul cC* 19 57 28.6054979616 +26 33 23.284943352   10.16 8.87   7.147 F8Ia 165 0
47 V* CD Cyg cC* 20 04 26.5612467720 +34 06 44.187399612   9.35 8.35     F8-G5Iab-Ib 198 0
48 V* V402 Cyg cC* 20 09 07.7596272456 +37 09 07.088017032   10.9 9.87   8.674 G0III 94 0
49 V* MW Cyg cC* 20 12 22.8295152168 +32 52 17.841761616   10.71 9.45   7.882 F8.5-G2Ib 113 0
50 V* SZ Cyg cC* 20 32 54.2938782720 +46 36 04.584933612   10.80 9.37   7.770 F7.5/8-G6.5Ib 150 0
51 V* X Cyg cC* 20 43 24.1917118680 +35 35 16.077149700 8.69 7.70 6.47   5.241 F7Ib 457 0
52 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
53 V* V459 Cyg cC* 21 10 54.3730781040 +49 08 31.400535876   11.76 10.54   8.845 F8 78 0
54 V* V386 Cyg cC* 21 14 40.4340798432 +41 42 58.846926780   11.12 9.75   7.750 F5.5-G0Ib 123 1
55 V* V538 Cyg cC* 21 37 28.1282362296 +51 45 44.947238508   11.65 10.50     ~ 52 0
56 V* VZ Cyg cC* 21 51 41.4416202624 +43 08 02.542086024   10.02 8.60   7.948 G0 164 0
57 V* BG Lac cC* 22 00 25.1466021504 +43 26 43.331629776   9.33 8.59   7.793 G0.7 146 0
58 V* Y Lac cC* 22 09 02.9002579560 +51 02 45.084186096   9.79 9.13   8.292 F8 169 0
59 * del Cep cC* 22 29 10.2626640314 +58 24 54.697613650 4.71 4.35 3.75   3.219 F5Iab:+B7-8 710 0
60 V* Z Lac cC* 22 40 52.1457028632 +56 49 46.083774432   9.71 8.57   7.164 F6Ib 221 0
61 V* RR Lac cC* 22 41 26.5260757056 +56 25 58.031784048   9.68 8.87   7.786 K0 168 0
62 V* V Lac cC* 22 48 37.9955013336 +56 19 17.542728372   9.72 8.89   7.883 G5 159 0
63 V* SW Cas cC* 23 07 10.0825764168 +58 33 15.130371528   10.73 9.74   8.397 K0 116 0
64 V* DD Cas cC* 23 57 34.9602200184 +62 43 05.686391208   10.95 9.84   8.516 F7 121 0
65 V* CF Cas cC* 23 58 17.9760671064 +61 13 15.821693832   12.72 10.80   9.700 F8Ibv 233 0
66 NAME Local Group GrG ~ ~           ~ 7892 0

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2023.01.27-18:10:10

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