2008A&A...489.1399R


Query : 2008A&A...489.1399R

2008A&A...489.1399R - Astronomy and Astrophysics, volume 489, 1399-1408 (2008/10-3)

Milliarcsecond angular resolution of reddened stellar sources in the vicinity of the Galactic center.

RICHICHI A., FORS O., MASON E., STEGMEIER J. and CHANDRASEKHAR T.

Abstract (from CDS):

For the first time, the lunar occultation technique has been employed on a very large telescope in the near-IR with the aim of systematically achieving milliarcsecond resolution on stellar sources. We have demonstrated the burst mode of the ISAAC instrument, using a fast read-out on a small area of the detector to record many tens of seconds of data at a time on fields of a few squared arcseconds. We used the opportunity to record a large number of LO events during a passage of the Moon close to the Galactic center in March 2006. We developed and employed for the first time a data pipeline for the treatment of LO data, including the automated estimation of the main data analysis parameters using a wavelet-based method and the preliminary fitting and plotting of all light curves. We recorded 51 LO events over about four hours. Of these, 30 resulted in sufficient quality to enable a detailed fitting. We detected two binaries with subarcsecond projected separation and three stars with a marginally resolved angular diameter of about 2 milliarcsec. Two more stars, which are cross-identified with SiO masers, were found to be resolved and in one case we could recover the brightness profile of the extended emission, which is consistent with an optically thin shell. The remaining unresolved stars were used to characterize the performance of the method. The LO technique at a very large telescope is a powerful and efficient method for achieving angular resolution, sensitivity, and dynamic range that are among the best possible today with any technique. The selection of targets is naturally limited and LOs are fixed-time events; however, each observation requires only a few minutes, including overheads. As such, LOs are ideally suited to filling small gaps during the idle time between standard observations.

Abstract Copyright:

Journal keyword(s): techniques: high angular resolution - astrometry - occultations - binaries: general - masers

Simbad objects: 57

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Number of rows : 57
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 2MASS J17383141-2812445 NIR 17 38 31.4091966738 -28 12 44.615199021         13.32 ~ 2 0
2 HD 316057 * 17 38 33.1485044612 -28 36 15.835000821   11.35 9.80 9.75 8.85 K5 2 0
3 2MASS J17385407-2833227 NIR 17 38 54.0735640052 -28 33 22.838009544         16.07 ~ 2 0
4 2MASS J17385533-2836105 NIR 17 38 55.34 -28 36 10.5           ~ 2 0
5 2MASS J17391567-2826194 NIR 17 39 15.6677349832 -28 26 19.500509540           ~ 1 0
6 2MASS J17394022-2820124 NIR 17 39 40.23 -28 20 12.5           ~ 2 0
7 2MASS J17394602-2822089 NIR 17 39 46.02 -28 22 08.9           ~ 2 0
8 2MASS J17394834-2809136 NIR 17 39 48.3317112589 -28 09 13.752260962           ~ 1 0
9 CD-28 13409 * 17 39 50.3812468916 -28 24 06.053379036   12.32 10.33     F 3 0
10 2MASS J17402750-2833099 NIR 17 40 27.51 -28 33 10.0           ~ 1 0
11 2MASS J17402920-2842361 * 17 40 29.2068154149 -28 42 36.134044548           ~ 1 0
12 2MASS J17404347-2827185 * 17 40 43.4756160820 -28 27 18.400606834           ~ 1 0
13 [RHI84] 10-333 * 17 40 51.1167591804 -28 17 13.023833691     17.10     M6.5 4 0
14 2MASS J17410318-2814151 NIR 17 41 03.1730013628 -28 14 15.129215393           ~ 1 0
15 [SGG2000] 13927 V* 17 41 09.3697694660 -28 22 41.903968120           ~ 2 0
16 2MASS J17411109-2840486 NIR 17 41 11.09 -28 40 48.6         16.01 ~ 1 0
17 [RHI84] 10-352 * 17 41 13.9131986387 -28 18 04.042446913     16.50     M5 2 0
18 2MASS J17411415-2818051 NIR 17 41 14.16 -28 18 05.2           ~ 2 0
19 [RHI84] 10-356 * 17 41 21.1620133774 -28 16 01.076836900     13.90     M5 2 0
20 2MASS J17412349-2821538 NIR 17 41 23.4870562042 -28 21 53.859366266         14.93 ~ 1 0
21 [RHI84] 10-368 AB? 17 41 34.3444527411 -28 29 22.382443477     17.40     M7 8 0
22 2MASS J17414185-2842287 NIR 17 41 41.8629346120 -28 42 28.723329772         14.01 ~ 1 0
23 ISOGAL-P J174146.5-282259 AB? 17 41 46.4198424815 -28 22 59.417819461       15.85   ~ 6 0
24 2MASS J17415470-2826596 NIR 17 41 54.6974910570 -28 26 59.659665042         16.76 ~ 1 0
25 ISOGAL-P J174154.7-282659 V*? 17 41 54.7 -28 26 59           ~ 2 0
26 2MASS J17415719-2834236 NIR 17 41 57.20 -28 34 23.6         16.73 ~ 1 0
27 2MASS J17420509-2833465 NIR 17 42 05.0919089437 -28 33 46.649880518         15.46 ~ 1 0
28 HD 160706 * 17 42 32.9524343280 -28 18 47.454587730   9.93 8.28     G3Ib/II 10 0
29 [RHI84] 10-416 * 17 42 37.4657061087 -28 25 31.177089109     14.60   10.26 M6.5 2 0
30 IRAS 17395-2825 * 17 42 40.4001580584 -28 26 25.634502738         13.23 ~ 1 0
31 2MASS J17425497-2836593 NIR 17 42 54.9795936590 -28 36 59.241553492           ~ 2 0
32 TYC 6839-270-1 * 17 42 56.2140342669 -28 20 36.997848202   12.89 10.41     ~ 2 0
33 2MASS J17430791-2828016 NIR 17 43 07.91 -28 28 01.7           ~ 1 0
34 2MASS J17430901-2837039 NIR 17 43 09.0100484290 -28 37 03.921022224           ~ 2 0
35 2MASS J17431348-2837004 NIR 17 43 13.4876327497 -28 37 00.464049445           ~ 2 0
36 ISOGAL-P J174323.6-285349 AB* 17 43 23.4588262410 -28 53 50.212402710           O-rich 6 0
37 TYC 6840-472-1 * 17 43 25.8609411250 -28 23 59.889147350   11.87 11.03   9.14 ~ 1 0
38 [RHI84] 10-443 * 17 43 26.3892747653 -28 27 59.306924836     12.20     M2: 2 0
39 2MASS J17432661-2827590 NIR 17 43 26.6651056635 -28 27 58.952039954           ~ 1 0
40 [RHI84] 10-464 AB? 17 43 46.8182914018 -28 40 17.758969438     19.00     M6: 5 0
41 [RHI84] 10-463 * 17 43 48.3143288593 -28 28 13.026600037     18.50   12.32 M6.5 2 0
42 IRAS 17407-2840 AB* 17 43 54.0011755165 -28 41 28.512039178           O-rich 4 0
43 IRAS 17407-2829 IR 17 43 56.9 -28 30 44           ~ 3 0
44 2MASS J17435704-2830432 NIR 17 43 57.0495688120 -28 30 43.289037631           ~ 1 0
45 2MASS J17435893-2827521 NIR 17 43 58.9432224757 -28 27 52.159530097         14.07 ~ 1 0
46 HD 316221 * 17 44 13.6590908496 -28 48 50.159966038   11.32 9.94     K0 3 0
47 2MASS J17443976-2830568 NIR 17 44 39.7581449976 -28 30 56.774884310           ~ 1 0
48 2MASS J17444369-2825027 NIR 17 44 43.6936571702 -28 25 02.737768880           ~ 1 0
49 2MASS J17445251-2826479 NIR 17 44 52.5172633718 -28 26 47.947625043         14.39 ~ 1 0
50 2MASS J17445945-2843238 NIR 17 44 59.4499466586 -28 43 23.877211999         13.75 ~ 1 0
51 [RHI84] 10-515 * 17 45 04.1292764981 -28 53 41.237798211     12.90     M2 3 0
52 2MASS J17452448-2826434 NIR 17 45 24.4852521608 -28 26 43.365629235           ~ 1 0
53 2MASS J17452968-2829325 NIR 17 45 29.6851680553 -28 29 32.573848266           ~ 2 0
54 ISOGAL-P J174532.3-283338 AB* 17 45 32.2423126529 -28 33 42.845653345           O-rich 6 0
55 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12299 0
56 2MASS J17460150-2828035 NIR 17 46 01.5108836000 -28 28 03.676589649           ~ 2 0
57 NAME Galactic Bulge reg ~ ~           ~ 3622 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-17:13:12

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