1997A&A...320..799F


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST16:41:43

1997A&A...320..799F - Astronomy and Astrophysics, volume 320, 799-810 (1997/4-3)

An improved calibration of Cepheid visual and infrared surface brightness relations from accurate angular diameter measurements of cool giants and supergiants.

FOUQUE P. and GIEREN W.P.

Abstract (from CDS):

We have calibrated optical and near-infrared surface brightness - colour relations for cool giant and supergiant stars using high-precision angular diameters of these stars determined from Michelson interferometry. We find that the giant and supergiant relations are undistinguishable over a wide range of intrinsic colours. We independently determine the slopes of these relations obeyed by Cepheid variables and find that in all the diagrams considered, these agree very well with the slopes derived from the stable giants and supergiants. Forcing the slopes to the values derived from the Cepheids, we determine a very precise value of the zero point of the surface brightness - colour relations valid for Cepheid variables, which is 3.947±0.003. This value is in agreement with the one derived from the Cepheid effective temperature scale of Pel (1978A&A....62...75P), and from the lunar occultation angular diameter of the Cepheid ζ Gem (Ridgway et al. 1982AJ.....87..680R). We apply our newly calibrated surface brightness - colour relations to the cluster Cepheid U Sgr to find its radius and distance from the optical V, V-RJ and the infrared V, V-K and K, J-K Barnes-Evans technique. While the numerical values derived from the three different versions of the technique do agree within 1-σ, the near-infrared distance and radius values are 5-10 times more accurate than the optical one; in particular, the distance and radius of the star derived from the V, V - K solution are 592 ±4 pc and 48.7 ±0.3 solar radii, respectively, with errors less than 1 percent. We briefly discuss the potential of the near-infrared versions of the Barnes-Evans technique to set a very accurate (0.02mag) zero point to Cepheid period-luminosity relations and thus make a very important contribution to the absolute calibration of the extragalactic distance scale.

Abstract Copyright:

Journal keyword(s): cepheids - stars: distances - stars: fundamental parameters - stars: individual: U Sgr - infrared: stars

Simbad objects: 42

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Number of rows : 42

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 * del And SB* 00 39 19.6751809 +30 51 39.678320 6.04 4.56 3.28 2.36 1.70 K3III-IIIbCN0.5 316 0
2 * alf Cas PM* 00 40 30.4410679 +56 32 14.392170 4.52 3.40 2.23 1.45 0.85 K0-IIIa 322 0
3 * bet And PM* 01 09 43.92388 +35 37 14.0075 5.58 3.62 2.05 0.81 -0.19 M0+IIIa 538 0
4 * gam01 And SB* 02 03 53.95229 +42 19 47.0223 4.22 3.30 2.10 1.16 0.47 K2+IIb 334 0
5 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 609 1
6 * eta Per * 02 50 41.8095904 +55 53 43.787576 7.38 5.48 3.79 2.56 1.67 K3-Ib-IIa 205 0
7 * alf Cet LP? 03 02 16.77307 +04 05 23.0596 6.10 4.17 2.53 1.18 0.02 M1.5IIIa 443 0
8 * zet Aur EB* 05 02 28.6873880 +41 04 33.019985 5.35 4.97 3.75 2.62 1.75 K5II+B7V 441 0
9 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1146 0
10 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 424 0
11 V* CV Mon cC* 06 37 04.8448658715 +03 03 50.276498200   11.32 9.90   8.631 ~ 217 0
12 * eps Gem V* 06 43 55.9262590 +25 07 52.051484 5.85 4.39 2.98 2.01 1.40 G8Ib 381 0
13 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 541 0
14 * del CMa s*y 07 08 23.4840514 -26 23 35.518484 3.06 2.52 1.84 1.33 1.00 F8Ia 329 0
15 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1783 0
16 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1062 1
17 V* RZ Vel cC* 08 37 01.3029337589 -44 06 52.844429407   8.507 7.260     G1Ib 203 0
18 V* T Vel cC* 08 37 40.8268486937 -47 21 43.082343785   8.92 7.68   6.970 G0II 154 0
19 V* SW Vel cC* 08 43 38.6904013543 -47 24 11.196771088   9.58 8.32     F8/G0Ib 171 0
20 * alf Lyn PM* 09 21 03.3007431 +34 23 33.224546 6.63 4.69 3.14 1.91 1.01 K6III 199 0
21 V* RY Vel cC* 10 20 41.0317627466 -55 19 17.035924264   9.71 7.86   6.840 F5Ib/II 134 0
22 V* U Car cC* 10 57 48.1866898409 -59 43 55.880151632 8.31 7.21 6.11   5.073 G5/8Iab 216 0
23 V* BY Boo LP? 14 07 55.7560046 +43 51 16.025944 8.52 6.86 5.28 3.43 1.77 M4.5III 168 0
24 V* V Cen cC* 14 32 33.0828020969 -56 53 15.774776152 8.44 7.84 6.93   5.798 F5Ib/II 247 0
25 V* U Nor cC* 15 42 20.9180199642 -55 18 42.941765163   10.68 9.22     F8Ib/II 128 0
26 * del Oph PM* 16 14 20.73853 -03 41 39.5612 6.30 4.34 2.75 1.46 0.43 M0.5III 348 0
27 V* BF Oph cC* 17 06 05.4979763004 -26 34 50.031704299 8.00 7.61 6.93   6.377 G0II 206 0
28 * alf Her A LP* 17 14 38.852741 +14 23 25.33577   4.67 3.33     M5Ib-II 429 0
29 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 524 0
30 V* WZ Sgr cC* 18 16 59.7158915244 -19 04 32.989119557   9.10 7.45     F7(III) 233 0
31 IC 4725 OpC 18 31 47 -19 07.0           ~ 197 0
32 V* U Sgr cC* 18 31 53.3321808602 -19 07 30.262730218 8.50 7.81 6.68   5.413 G1Ib 439 0
33 * del02 Lyr LP* 18 54 30.2833502 +36 53 55.013331 7.62 5.97 4.30 2.52 0.89 M4II 222 0
34 * gam Aql * 19 46 15.5802908 +10 36 47.740788 5.93 4.23 2.72 1.65 0.87 K3II 422 0
35 * del Sge SB* 19 47 23.2665287783 +18 32 03.520263112 6.20 5.23 3.82 2.37 1.08 M2II+B0V 195 0
36 * 31 Cyg EB* 20 13 37.9108031301 +46 44 28.738836638 5.50 5.08 3.80 2.83 2.07 K3Ib+B2IV-V 355 0
37 * omi02 Cyg EB* 20 15 28.3216287393 +47 42 51.221859715 6.54 5.50 3.98 2.78 1.86 K7Ib-II+B1V 322 0
38 * eps Cyg ** 20 46 12.6823609 +33 58 12.924926 4.370 3.520 2.480 1.73 1.19 K0III 485 0
39 * k Aqr LP* 20 47 44.2389847 -05 01 39.721978 8.04 6.11 4.44 2.97 1.66 M3III 120 0
40 * ksi Cyg SB* 21 04 55.8622910 +43 55 40.264460 7.17 5.39 3.73 2.55 1.63 K4.5Ib-II 299 0
41 * eps Peg LP* 21 44 11.1561394 +09 52 30.031152 5.61 3.91 2.39 1.34 0.58 K2Ib-II 434 0
42 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 689 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-16:41:43

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