2010A&A...522A..65R


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.29CEST03:49:53

2010A&A...522A..65R - Astronomy and Astrophysics, volume 522, A65-65 (2010/11-1)

New high-sensitivity, milliarcsecond resolution results from routine observations of lunar occultations at the ESO VLT.

RICHICHI A., FORS O., CHEN W.-P. and MASON E.

Abstract (from CDS):

Lunar occultations (LO) are a very efficient and powerful technique that achieves the best combination of high angular resolution and sensitivity possible today at near-infrared wavelengths. Given that the events are fixed in time, that the sources are occulted randomly, and that the telescope use is minimal, the technique is very well suited for service mode observations. We have established a program of routine LO observations at the VLT observatory, especially designed to take advantage of short breaks available in-between other programs. We have used the ISAAC instrument in burst mode, capable of producing continuous read-outs at millisecond rates on a suitable subwindow. Given the random nature of the source selection, our aim has been primarily the investigation of a large number of stellar sources at the highest angular resolution in order to detect new binaries. Serendipitous results such as resolved sources and detection of circumstellar components were also anticipated. We have recorded the signal from background stars for a few seconds, around the predicted time of occultation by the Moon's dark limb. At millisecond time resolution, a characteristic diffraction pattern can be observed. Patterns for two or more sources superimpose linearly, and this property is used for the detection of binary stars. The detailed analysis of the diffraction fringes can be used to measure specific properties such as the stellar angular size and the presence of extended light sources such as a circumstellar shell. We present a list of 191 stars for which LO data could be recorded and analyzed.
Result. include the detection of 16 binary and 2 triple stars, all but one of which were previously unknown. The projected angular separations are as small as 4 milliarcsec and magnitude differences as high as ΔK=5.8mag. Additionally we derive accurate angular diameters for 2 stars and resolve circumstellar emission around another one, also all for the first time. We have established upper limits on the angular size of 177 stars, mostly in the 1 to 5mas range, and we plan to include them in a future list of sources well suited for the calibration of interferometers. We confirm the performance of the technique already established in our previous work. LO at an 8m-class telescope can achieve an angular resolution close to 0.001" with a sensitivity K≃12mag.

Abstract Copyright:

Journal keyword(s): techniques: high angular resolution - occultations - binaries: general - stars: fundamental parameters - circumstellar matter - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/522/A65): table1.dat>

Status at CDS:   could be processed
// All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 77

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Number of rows : 77

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 TYC 1386-551-1 * 08 20 15.1443675018 +20 19 53.428411238   10.89 10.48     ~ 2 0
2 HD 69994 PM* 08 20 20.9713501489 +20 44 51.801153869   6.942 5.798     K1III 37 0
3 BD+18 2134 * 09 10 32.2255248771 +17 38 13.602687350   10.21 9.65     G0 3 0
4 HD 88071 * 10 09 31.4644776233 +09 35 35.119713351   8.75 7.11     M0 14 0
5 UCAC2 34843124 * 10 14 24.0700973591 +08 43 55.009230241           ~ 1 0
6 BD+09 2321 PM* 10 14 28.3393482506 +08 37 11.190196191   10.20 9.69     F8 14 0
7 BD+07 2318 * 10 31 22.2099741773 +06 35 58.673700201   11.37 10.51     K0 5 0
8 TYC 259-1407-1 * 10 32 03.5384652195 +06 29 54.375011446   11.70 10.97     ~ 1 0
9 NLTT 24622 PM* 10 32 32.9728391814 +06 30 07.590137500   17.0   14.6   M6V 11 0
10 HD 91411 * 10 33 19.6353130460 +06 21 59.296133112   9.86 9.31     G0 7 0
11 TYC 6166-205-1 * 14 45 09.7131394415 -21 26 41.541935074   12.040 10.800     ~ 3 0
12 HD 129980 ** 14 46 10.87977 -21 10 33.4621   7.044 6.435     G1V 67 0
13 HD 129991 * 14 46 21.1518112434 -21 08 35.725780987   10.57 8.97     K3V 4 0
14 * 17 Lib * 14 58 13.4128437018 -11 09 17.150652321   6.604 6.601     K2III 31 0
15 2MASS J15190984-2257010 * 15 19 09.8462695968 -22 57 00.948282858   13.163 11.925 11.04 10.648 ~ 4 0
16 TYC 6763-1774-1 * 15 28 05.4046382155 -24 03 09.706800513   12.539 11.561 10.88 10.474 ~ 3 0
17 CD-23 12317 PM* 15 28 45.8728680271 -24 04 00.452343876   10.891 9.908     ~ 3 0
18 HD 137858 * 15 29 08.6397627067 -23 41 57.833541950   10.291 9.651     G2/3V 10 0
19 CD-23 12336 * 15 30 34.4870054 -24 17 58.233828   10.90 10.13     ~ 6 0
20 CD-24 12146 * 15 32 07.3840984400 -24 27 13.031612937   11.57 10.35     K1IV 2 0
21 CD-24 12159 * 15 33 43.5622694094 -24 26 40.033185764   11.91 10.46     ~ 1 0
22 CD-24 12195 * 15 36 50.3240948254 -24 35 11.577222033   11.19 9.96     ~ 2 0
23 TYC 6781-127-1 * 15 37 47.9498366851 -24 25 02.946678802   11.35 10.78     ~ 2 0
24 IRAS 17045-2550 * 17 07 38.9235376280 -25 54 52.280658146       13.96   ~ 1 0
25 IRAS 17068-2545 V* 17 09 58.6572641383 -25 49 19.658768937           ~ 2 0
26 IRAS 17069-2552 V* 17 10 03.2096862351 -25 56 37.873475936           ~ 3 0
27 CD-25 12008 * 17 11 31.6690363251 -25 59 34.751082882   10.89 8.99     ~ 1 0
28 Terz V 879 V* 17 14 10.98864 -27 20 52.6416           ~ 2 0
29 Terz V 891 V* 17 14 28.0131328695 -27 22 48.831121782           ~ 3 0
30 IRAS 17118-2728 V* 17 15 01.4211319391 -27 31 58.881883231           ~ 3 0
31 CD-27 11537 * 17 15 19.1575676245 -27 30 17.490663251   11.95 10.49   8.63 ~ 1 0
32 IRAS 17126-2722 V* 17 15 44.6954581771 -27 26 09.792777311           ~ 3 0
33 Terz V 963 V* 17 15 52.5225697076 -27 37 04.730679733           ~ 3 0
34 Terz V 1063 V* 17 18 05.6005293515 -27 38 28.874050233           ~ 3 0
35 IRAS 17155-2713 * 17 18 41.8995928426 -27 16 07.631307572           ~ 1 0
36 IRAS 17159-2722 V* 17 19 02.6796041717 -27 25 13.489174554           ~ 3 0
37 IRAS 17159-2714 V* 17 19 07.7651399539 -27 18 02.443637213           ~ 3 0
38 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11446 0
39 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 188 0
40 V* V1890 Sgr Mi* 18 29 07.0886491369 -27 02 32.726124850           M4 5 0
41 TYC 6866-75-1 * 18 35 34.0061 -26 16 44.781   11.44 10.15   8.76 ~ 2 0
42 CD-26 13301 *i* 18 35 34.05 -26 16 44.1     9.9     ~ 2 0
43 CD-26 13318 * 18 36 44.1905308586 -26 09 38.328695037   11.01 9.58     ~ 2 0
44 V* V2012 Sgr Mi* 18 37 12.3718258513 -26 10 22.196041740           M7 7 0
45 HD 178198 * 19 08 40.0145352659 -25 15 46.706305018   10.77 9.08     K2III 4 0
46 HD 178343 * 19 09 16.1955504294 -25 06 55.927714747   10.35 9.01     K2III 4 0
47 CD-25 13997 * 19 23 32.2203347560 -24 45 54.272989511   12.01 10.39     ~ 2 0
48 CD-24 15292 * 19 24 14.0498292070 -24 43 56.216927306   11.74 10.42     ~ 2 0
49 CD-24 15356 * 19 28 36.6543593871 -24 21 19.001857270   11.52 9.79     ~ 1 0
50 CD-24 15361 * 19 29 10.2071174375 -23 57 22.969429985   10.68 9.63     ~ 1 0
51 CD-24 15366 * 19 29 20.7379982694 -24 15 48.238309194   11.22 9.86     ~ 2 0
52 CD-24 15375 * 19 30 10.2427362715 -24 04 27.978092957   11.90 10.25     ~ 2 0
53 IRAS 19280-2416 * 19 31 06.6742462256 -24 10 01.333309051   11.96 10.92   8.23 ~ 1 0
54 TYC 6876-820-1 * 19 31 27.3024642249 -23 52 51.838247633   11.33 10.07     ~ 2 0
55 V* V440 Sgr RR* 19 32 20.7826740973 -23 51 12.757032166   10.6 10.6     F0 86 0
56 HD 188941 PM* 19 58 26.2606263773 -22 35 33.648056981   10.60 9.52     G8/K0IV/V 4 0
57 HD 188977 * 19 58 33.8639063295 -22 15 06.959126049   9.27 8.13     K0III 5 0
58 2MASS J19590076-2233239 * 19 59 00.7609627376 -22 33 24.098914521           M1III 3 0
59 HD 189075 * 19 59 03.1594077780 -22 15 51.873476690   10.65 9.16     K2/3(III) 3 0
60 HD 192412 PM* 20 15 30.9565863860 -21 27 52.227400488   9.67 8.63     G8/K0IV 5 0
61 BD-21 5661 * 20 15 37.2641603194 -21 21 35.676721774   11.448 10.298     ~ 3 0
62 BD-21 5666 * 20 16 03.8735938669 -21 22 02.776373195   11.96 10.56     ~ 2 0
63 BD-18 5712 * 20 34 36.1585019304 -17 56 21.326542952   11.10 10.00     ~ 2 0
64 HD 196043 * 20 35 24.3373212345 -17 47 17.683521145   8.73 8.35     F0/2V 13 0
65 TYC 6334-422-1 * 20 35 29.2908013595 -17 45 32.589208755   11.973 10.613 9.97 9.389 ~ 7 0
66 BD-18 5722 * 20 36 32.0721983892 -17 31 51.586889380   11.665 10.529     ~ 3 0
67 HD 196413 * 20 37 48.9220380497 -17 07 20.840950079 6.87 7.04 7.08     B9V 12 0
68 V* AW Cap a2* 20 38 09.8032560023 -17 30 06.487280636   10.14 9.71     FpSrEu 30 0
69 TYC 6334-955-1 * 20 38 17.9656258380 -17 02 51.094994835   11.81 10.76     ~ 3 0
70 HD 196557 * 20 38 42.4782421260 -17 03 55.160643507   9.40 7.87     K4/5III 8 0
71 BD-17 6050 * 20 40 01.6020346111 -16 56 26.828814718   11.226 10.655     ~ 4 0
72 BD-17 6051 * 20 40 21.9161802021 -17 02 23.103888411   11.76 10.21     ~ 3 0
73 BD-17 6053 * 20 40 29.6029757133 -16 40 24.720834489   11.45 10.15     ~ 1 0
74 V* TX Cap Mi* 20 40 32.0890479426 -17 03 27.988916260   12.18 10.79     M4 17 0
75 HD 196872 * 20 40 44.6165256720 -16 54 46.093525092   10.75 9.64     K1III 4 0
76 BD-17 6056 * 20 40 58.6999490022 -17 04 06.842074037   11.150 9.744     ~ 3 0
77 HD 196978 * 20 41 16.8695304389 -16 41 38.951814398   10.503 9.086     K2/3III 5 0

    Equat.    Gal    SGal    Ecl

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2020.05.29-03:49:53

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