2004A&A...416..941K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:27:34

2004A&A...416..941K - Astronomy and Astrophysics, volume 416, 941-953 (2004/3-4)

Cepheid distances from infrared long-baseline interferometry. I. VINCI/VLTI observations of seven Galactic Cepheids.

KERVELLA P., NARDETTO N., BERSIER D., MOURARD D. and COUDE DU FORESTO V.

Abstract (from CDS):

We report the angular diameter measurements of seven classical Cepheids, X Sgr, η Aql, W Sgr, ζ Gem, β Dor, Y Oph and l Car that we have obtained with the VINCI instrument, installed at ESO's VLT Interferometer (VLTI). We also present reprocessed archive data obtained with the FLUOR/IOTA instrument on ζGem, in order to improve the phase coverage of our observations. We obtain average limb darkened angular diameter values of <θLD>[XSgr]=1.471±0.033mas, <θLD>[ηAql]=1.839±0.028mas, <θLD>[WSgr]=1.312±0.029mas, <θLD>[βDor]=1.891±0.024mas, <θLD>[ζGem]=1.747±0.061mas, <θLD>[YOph]=1.437±0.040mas, and<θLD>[lCar]=2.988±0.012mas. For four of these stars, η Aql, W Sgr, β Dor, and l Car, we detect the pulsational variation of their angular diameter. This enables us to compute directly their distances, using a modified version of the Baade-Wesselink method: d[ηAql]=276+55–38pc, d[WSgr]=379+216–130pc, d[βDor]=345+175–80pc, d[lCar]=603+24–19pc. The stated error bars are statistical in nature. Applying a hybrid method, that makes use of the Gieren et al. (1998ApJ...496...17G) Period-Radius relation to estimate the linear diameters, we obtain the following distances (statistical and systematic error bars are mentioned): d[XSgr]=324±7±17pc, d[ηAql]=264±4 ±14pc, d[WSgr]=386±9 ±21pc, d[βDor]=326±4 ±19pc, d[ζGem]=360±13 ±22pc, d[YOph]=648±17±47pc, d[lCar]=542±2 ±49pc.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - stars: variables: Cepheids - stars: oscillations

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * chi Phe PM* 02 01 42.3769730947 -44 42 48.626974441 8.45 6.63 5.14 3.92 3.03 K5IV 55 0
2 * 39 Eri ** 04 14 23.68902 -10 15 22.6083 7.18 6.04 4.86 4.01 3.44 K2III 100 0
3 * eps Ret PM* 04 16 29.0292136 -59 18 07.761375 6.59 5.52 4.44 3.62 3.08 K2III 212 1
4 * bet Dor cC* 05 33 37.5125319201 -62 29 23.323100433 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 345 0
5 HD 50235 * 06 50 52.3519384867 -34 22 02.347412642   6.370 4.989     K2/3III 27 0
6 * 87 Gem * 06 51 59.9870937808 +23 36 06.186558421   7.142 5.671     K5III 41 0
7 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 529 0
8 * gam02 Vol PM* 07 08 44.8636348625 -70 29 56.123442258   4.774 3.746     K0III 63 0
9 * Q Pup PM* 07 48 20.1604257 -47 04 39.798540 6.69 5.77 4.71 3.95 3.38 K0IIIb 42 0
10 * 6 Pup PM* 07 49 41.2012025731 -17 13 42.264757552   6.462 5.162     K3III 50 0
11 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 286 1
12 * q Car LP* 10 17 04.9753050 -61 19 56.288301   4.899 3.350     K2.5II 123 0
13 * r Vel PM* 10 22 19.5847748691 -41 38 59.859181660 7.04 5.95 4.83 4.03 3.45 K1III 45 0
14 V* V918 Cen LP* 11 47 19.1423539012 -57 41 47.400890398   7.055 5.407     K5III 42 0
15 * B Cen PM* 11 51 08.6914879300 -45 10 24.488999847 7.22 5.76 4.46 3.52 2.85 K3III 71 0
16 * w Cen PM* 12 42 35.4514345 -48 48 47.189811 6.77 5.76 4.66 3.91 3.34 K0III 64 0
17 * chi Sco * 16 13 50.9069224118 -11 50 15.905491351   6.615 5.239     K3III 58 0
18 V* X Sgr cC* 17 47 33.6241002643 -27 49 50.848981593 5.84 5.34 4.54 6.03 3.661 F7II 305 0
19 V* Y Oph cC* 17 52 38.7021149511 -06 08 36.875163136 8.62 7.61 6.21     G3Ia 338 0
20 * gam01 Sgr cC* 18 05 01.2265190155 -29 34 48.303215344 5.99 5.47 4.69   3.869 G0Ib/II 324 0
21 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 632 0
22 * 70 Aql * 20 36 43.6339444744 -02 32 59.834172996   6.475 4.880     K4+IIIBa1 70 0
23 * 7 Aqr * 20 56 54.0262588970 -09 41 51.160983576   6.97 5.48     K4III 37 0
24 * eps Ind PM* 22 03 21.6542294981 -56 47 09.537018193   5.75 4.69     K5V 476 0
25 * lam Gru PM* 22 06 06.8856828 -39 32 36.065850   5.843 4.458     K3III 56 0
26 HD 216149 * 22 51 02.1592317599 -39 09 24.607417936   6.851 5.400     K3III 50 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-20:27:34

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