2006A&A...448..623K


Query : 2006A&A...448..623K

2006A&A...448..623K - Astronomy and Astrophysics, volume 448, 623-631 (2006/3-3)

Extended envelopes around Galactic Cepheids. I. l Carinae from near and mid-infrared interferometry with the VLTI.

KERVELLA P., MERAND A., PERRIN G. and COUDE DU FORESTO V.

Abstract (from CDS):

We present the results of long-baseline interferometric observations of the bright southern Cepheid l Carinae in the infrared N (8-13µm) and K (2.0-2.4µm) bands, using the MIDI and VINCI instruments of the VLT Interferometer. We resolve in the N band a large circumstellar envelope (CSE) that we model with a Gaussian of 3R* (≃500R≃2-3AU) half width at half maximum. The signature of this envelope is also detected in our K band data as a deviation from a single limb darkened disk visibility function. The superimposition of a Gaussian CSE on the limb darkened disk model of the Cepheid star results in a significantly better fit of our VINCI data. The extracted CSE parameters in the K band are a half width at half maximum of 2R*, comparable to the N band model, and a total brightness of 4% of the stellar photosphere. A possibility is that this CSE is linked to the relatively large mass loss rate of l Car. Though its physical nature cannot be determined from our data, we discuss an analogy with the molecular envelopes of RV Tauri, red supergiants and Miras.

Abstract Copyright:

Journal keyword(s): Cepheids - techniques: interferometric - stars: circumstellar matter - stars: individual: l Car

Simbad objects: 32

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Number of rows : 32
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 V* SU Cas cC* 02 51 58.7508894403 +68 53 18.601570075 6.92 6.44 5.80     F5.5III+ 413 1
2 * bet Dor cC* 05 33 37.5125319201 -62 29 23.323100433 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 356 0
3 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1529 0
4 V* T Mon cC* 06 25 12.9997562821 +07 05 08.561189768 8.24 7.20 5.98   4.996 G3Iabv+A0p 452 1
5 * 48 Aur cC* 06 28 34.0875086 +30 29 34.914168 6.73 6.23 5.55   4.777 F5.5-G0Ib 369 0
6 * ome Gem Ce* 07 02 24.7802014306 +24 12 55.607808445   6.136 5.181     G5IIa 113 0
7 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 545 0
8 * y03 Pup cC* 07 38 18.2087613998 -48 36 05.159134325   6.314 5.658 6.94   F7Ib/II 110 0
9 * Q Pup PM* 07 48 20.1604257 -47 04 39.798540 6.69 5.77 4.71 3.95 3.38 K0IIIb 44 0
10 HD 67582 V* 08 06 40.3398234615 -45 15 57.649421396   6.502 5.021     K3III 30 0
11 V* AH Vel cC* 08 11 59.9670207132 -46 38 39.656138625   6.35 5.76     F7Ib/II 165 0
12 V* RS Pup cC* 08 13 04.2157137938 -34 34 42.691837063 8.89 8.51 7.04   5.453 F8Iab 328 0
13 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 300 1
14 * r Vel PM* 10 22 19.5847748691 -41 38 59.859181660 7.04 5.95 4.83 4.03 3.45 K1III 47 0
15 V* V399 Car Ce* 10 27 24.4689104255 -57 38 19.691371729 5.29 5.18 4.70 4.10 3.62 A9/F0Ia/ab 130 0
16 V* U Car cC* 10 57 48.1866898409 -59 43 55.880151632 8.31 7.21 6.11   5.073 G5/8Iab 220 0
17 * x Car cC* 11 08 35.3899998 -58 58 30.135741 6.07 5.09 3.83 2.86 2.27 G5_0-Ia 144 0
18 * B Cen PM* 11 51 08.6914879300 -45 10 24.488999847 7.22 5.76 4.46 3.52 2.85 K3III 74 0
19 * 35 Cru cC* 12 31 40.3301092383 -59 25 26.122369782 6.60 6.19 5.53     F7Ib/II 132 0
20 * w Cen PM* 12 42 35.4514345 -48 48 47.189811 6.77 5.76 4.66 3.91 3.34 K0III 66 0
21 V* X Sgr cC* 17 47 33.6241002643 -27 49 50.848981593 5.84 5.34 4.54 6.03 3.661 F7II 318 0
22 V* Y Oph cC* 17 52 38.7021149511 -06 08 36.875163136 8.62 7.61 6.21     G3Ia 349 0
23 * gam01 Sgr cC* 18 05 01.2265190154 -29 34 48.303215344 5.99 5.47 4.69   3.869 G0Ib/II 334 0
24 V* Y Sgr cC* 18 21 22.9864295 -18 51 36.001763 7.31 6.69 5.75   4.810 F8II 277 0
25 V* AC Her pA* 18 30 16.2374666779 +21 52 00.618442618 8.00 7.79 7.01     F4Ibp 322 0
26 V* FF Aql cC* 18 58 14.7482217777 +17 21 39.295590199 6.61 6.18 5.38     F6Ib 349 0
27 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 645 0
28 * 10 Sge cC* 19 56 01.2614273274 +16 38 05.236276391 6.45 6.03 5.36 6.81 4.789 F7Ib 335 0
29 V* X Cyg cC* 20 43 24.1918662954 +35 35 16.075732392 8.69 7.70 6.47   5.241 F7Ib 447 0
30 V* T Vul cC* 20 51 28.2382502598 +28 15 01.816605372 6.89 6.49 5.77   5.061 F5Ib+A0.8V 326 0
31 V* DT Cyg cC* 21 06 30.2442673195 +31 11 04.765587914 6.70 6.38 5.82     F7II- 298 0
32 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 693 0

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2021.09.23-12:52:41

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