2011A&A...532A.101R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST01:13:41

2011A&A...532A.101R - Astronomy and Astrophysics, volume 532A, 101-101 (2011/8-1)

Lunar occultations of 184 stellar sources in two crowded regions toward the Galactic Bulge.

RICHICHI A., CHEN W.P., FORS O. and WANG P.F.

Abstract (from CDS):

Lunar occultations (LO) provide a unique combination of high angular resolution and sensitivity at near-infrared wavelenghts. At the ESO Very Large Telescope, it is possible to achieve about 1 milliarcsecond (mas) resolution and detect sources as faint as K≃12mag. We have taken advantage of a passage of the Moon over two crowded and reddened regions in the direction of the inner part of the Galactic bulge to obtain a high number of occultation light curves over two half nights. Our goal was to detect and characterize new binary systems, and to investigate highly extincted and relatively unknown infrared sources in search of circumstellar shells and similar peculiarities. Our target list included a significant number of very late-type stars, but the majority of the sources was without spectral classification. An LO event requires the sampling of the light curve at millisecond rates to permit a detailed study of the diffraction fringes. For this, we used the so-called burst mode of the ISAAC instrument at the Melipal telescope. Our observing efficiency was ultimately limited by overheads for telescope pointing and data storage to about one event every three minutes. We could record useful light curves for 184 sources. Of these, 24 were found to be binaries or multiples, all previously unknown. The projected separations are as small as 7.5mas, and the magnitude differences as high as ΔK=6.5mag. Additionally we could also establish for the first time the resolved nature of at least two more stars, along with an indication of circumstellar emission. We were also able to put upper limits on the angular size of about 165 unresolved stars, an information that combined with previous and future observations will be very helpful in establishing a list of reliable calibrators for long baseline interferometers. Many of the newly detected companions are beyond the present capabilities of other high angular resolution techniques, but some could be followed up by long baseline interferometry or adaptive optics. From estimates of the stellar density we conclude that statistically the influence of chance alignments appears to be negligible. We infer that most cases are probably giant-dwarf pairs.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/532/A101): table2.dat table3.dat>

Simbad objects: 186

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Number of rows : 186

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 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
2 2MASS J18012777-2538123 * 18 01 27.7690202463 -25 38 12.379131051           ~ 2 0
3 2MASS J18014156-2539527 * 18 01 41.5583742299 -25 39 52.802828911           ~ 2 0
4 IRAS 17586-2536 * 18 01 45.6122374337 -25 36 01.471616182           ~ 2 0
5 2MASS J18015392-2534372 * 18 01 53.9337101532 -25 34 37.285301069           ~ 2 0
6 2MASS J18015464-2529273 * 18 01 54.6526811184 -25 29 27.379056051           ~ 2 0
7 2MASS J18015800-2549077 * 18 01 58.001 -25 49 07.71           ~ 2 0
8 2MASS J18020084-2543076 * 18 02 00.8552541160 -25 43 07.710072841           ~ 1 0
9 2MASS J18020469-2553488 * 18 02 04.6954391497 -25 53 48.858160404           ~ 2 0
10 2MASS J18022315-2530237 * 18 02 23.1553063696 -25 30 23.848697699           ~ 2 0
11 HD 314951 ** 18 02 26.3687724126 -25 55 37.327112918   11.14 9.77     K5 2 0
12 IRAS 17594-2539 ** 18 02 31.8329545624 -25 39 06.772654823           ~ 1 0
13 2MASS J18024042-2549567 * 18 02 40.4219065766 -25 49 56.774400609           ~ 1 0
14 2MASS J18024090-2552007 * 18 02 40.9137749773 -25 52 00.848576673           ~ 1 0
15 2MASS J18024492-2535538 * 18 02 44.9273623997 -25 35 53.967484753           ~ 2 0
16 2MASS J18025652-2532392 ** 18 02 56.5232004704 -25 32 39.331430022           ~ 1 0
17 2MASS J18030392-2542136 * 18 03 03.9272847503 -25 42 13.652133351           ~ 2 0
18 2MASS J18030504-2536574 * 18 03 05.0539227524 -25 36 57.450396834           ~ 2 0
19 2MASS J18030533-2532570 * 18 03 05.3443658666 -25 32 57.025278807           ~ 1 0
20 2MASS J18030699-2543447 * 18 03 07.0000035449 -25 43 44.800726696           ~ 2 0
21 2MASS J18030885-2527400 * 18 03 08.8465427224 -25 27 39.948227492           ~ 2 0
22 2MASS J18030887-2535164 * 18 03 08.872 -25 35 16.43           ~ 2 0
23 IRAS 18002-2538 * 18 03 21.5972040752 -25 38 36.857283441   15.97 13.65 13.10 9.54 ~ 2 0
24 IRAS 18003-2526 ** 18 03 26.570 -25 26 10.38           ~ 3 0
25 2MASS J18032661-2538323 * 18 03 26.6158070038 -25 38 32.314336064           ~ 2 0
26 2MASS J18033221-2541506 * 18 03 32.215 -25 41 50.67           ~ 2 0
27 IRAS 18004-2547 mul 18 03 33.4 -25 47 41           ~ 2 1
28 2MASS J18033362-2547375 * 18 03 33.6325822997 -25 47 37.483045979         13.26 ~ 2 0
29 2MASS J18033401-2525313 * 18 03 34.0109731974 -25 25 31.345993498           ~ 2 0
30 2MASS J18033459-2544130 * 18 03 34.6013865522 -25 44 13.064155101           ~ 2 0
31 2MASS J18033522-2523185 ** 18 03 35.2292770863 -25 23 18.391803375           ~ 1 0
32 IRAS 18006-2533 * 18 03 46.3128241304 -25 33 15.328796848           ~ 2 0
33 2MASS J18035200-2547316 * 18 03 52.0005955524 -25 47 31.491191761           ~ 2 0
34 2MASS J18035693-2539570 * 18 03 56.9290771342 -25 39 57.089799385           ~ 2 0
35 2MASS J18040356-2523142 ** 18 04 03.5636156398 -25 23 14.277437025           ~ 1 0
36 2MASS J18040728-2539532 ** 18 04 07.2860451842 -25 39 53.261211518           ~ 1 0
37 IRAS 18010-2544 mul 18 04 11.9 -25 44 23           ~ 1 1
38 2MASS J18041207-2544225 * 18 04 12.0656716854 -25 44 21.824366539           ~ 1 0
39 2MASS J18041209-2544257 * 18 04 12.0955548099 -25 44 25.777881264           ~ 1 0
40 HD 315063 * 18 04 15.3097414887 -25 25 32.874870707   11.12 9.42     K5 2 0
41 2MASS J18042112-2533526 * 18 04 21.1263194797 -25 33 52.755580355           ~ 2 0
42 2MASS J18043001-2531141 * 18 04 30.0176899909 -25 31 14.229766185           ~ 2 0
43 2MASS J18043026-2541466 * 18 04 30.2673496777 -25 41 46.658843102           ~ 2 0
44 2MASS J18043132-2527356 * 18 04 31.3492451176 -25 27 35.645418087           ~ 2 0
45 2MASS J18044287-2544318 * 18 04 42.8785054506 -25 44 31.922720388           ~ 2 0
46 2MASS J18044594-2527198 * 18 04 45.9365005644 -25 27 19.875460625           ~ 2 0
47 HD 164972 * 18 04 48.4877422576 -25 36 20.515410668   7.70 7.19     F2/3II 21 0
48 2MASS J18045257-2528135 * 18 04 52.5780848096 -25 28 13.580505605           ~ 2 0
49 IRAS 18018-2524 * 18 04 53.7116319997 -25 24 22.620973335       15.04 10.48 ~ 1 0
50 2MASS J18050733-2543282 ** 18 05 07.3497893519 -25 43 28.318892204           ~ 1 0
51 2MASS J18050977-2543351 ** 18 05 09.779 -25 43 35.18           ~ 1 0
52 IRAS 18021-2529 * 18 05 10.9178490181 -25 29 25.747746440           ~ 2 0
53 IRAS 18022-2525 * 18 05 20.393 -25 24 57.31           ~ 2 0
54 2MASS J18052602-2523384 * 18 05 26.0249912066 -25 23 38.427111821           ~ 2 0
55 2MASS J18052646-2520179 * 18 05 26.4604456102 -25 20 17.905779396           ~ 2 0
56 2MASS J18053347-2537524 * 18 05 33.4726958630 -25 37 52.448717219           ~ 2 0
57 2MASS J18053438-2540309 ** 18 05 34.3908178248 -25 40 31.169323311           ~ 1 0
58 IRAS 18026-2543 * 18 05 42.1301906268 -25 43 19.680474469           ~ 1 0
59 Ve 4-66 ** 18 05 43.7292002758 -25 14 23.442995787     13.5 13.06   M8+: 8 0
60 2MASS J18054382-2537288 * 18 05 43.8333380102 -25 37 28.881938203           ~ 2 0
61 IRAS 18026-2540 * 18 05 44.9097586439 -25 40 39.863087840           ~ 1 0
62 MC79 1-187 S* 18 05 55.7542859367 -25 40 08.142587794       11.43   S3*4 5 0
63 IRC -30355 * 18 06 01.7577192715 -25 26 09.815841299   12.20 11.00     M6 5 0
64 2MASS J18061354-2515305 * 18 06 13.5508860983 -25 15 30.450494362           ~ 2 0
65 2MASS J18061707-2523008 * 18 06 17.0549629880 -25 23 00.640858124           ~ 2 0
66 IRAS 18033-2525 * 18 06 24.396 -25 25 35.39           ~ 1 0
67 IRAS 18034-2509 * 18 06 29.60424 -25 09 21.1968           ~ 2 0
68 2MASS J18063098-2509319 * 18 06 30.9877014356 -25 09 31.866253397           ~ 1 0
69 2MASS J18063720-2514416 * 18 06 37.1836588938 -25 14 42.146840804           ~ 1 0
70 IRAS 18035-2529 OH* 18 06 37.750 -25 29 27.73           ~ 8 0
71 IRAS 18037-2515 * 18 06 47.8860526542 -25 14 55.665377276           ~ 4 0
72 2MASS J18064977-2537355 * 18 06 49.7776962647 -25 37 35.598982619           ~ 2 0
73 HD 315192 * 18 06 50.9144427123 -25 29 56.202801444   11.65 9.95     M0 2 0
74 2MASS J18065490-2530316 * 18 06 54.8939729087 -25 30 31.764366540           ~ 2 0
75 2MASS J18071147-2509208 * 18 07 11.4719089494 -25 09 20.812089317           ~ 2 0
76 HD 315178 Em* 18 07 13.9899068700 -25 16 47.405970190 10.92 10.96 10.38 10.19   B8 14 0
77 2MASS J18071918-2524448 * 18 07 19.1728852820 -25 24 44.786502947           ~ 2 0
78 IRAS 18042-2517 * 18 07 20.6172814571 -25 17 19.021408884           ~ 6 0
79 HD 165517 Be* 18 07 27.2510510575 -25 06 16.494746489 8.42 9.30 9.10 9.16   B0Ia(n) 37 0
80 2MASS J18072731-2532426 * 18 07 27.3177082032 -25 32 42.765648529           ~ 2 0
81 HD 165530 ** 18 07 34.6330721325 -25 34 11.572452928   9.33 8.40 7.94   G6/8III+AV 8 0
82 IRAS 18045-2524 * 18 07 43.4771767893 -25 24 28.790595977           ~ 2 0
83 IRAS 18047-2533 Mi* 18 07 49.5250900003 -25 32 39.237666540     20.400   13.239 ~ 3 0
84 2MASS J18081328-2523474 * 18 08 13.2869155789 -25 23 47.342534552           ~ 1 0
85 2MASS J18081825-2521370 * 18 08 18.2441736927 -25 21 36.950733137           ~ 1 0
86 OGLE BLG-LPV-217134 Mi* 18 08 27.5219450574 -25 18 29.456169979         15.298 ~ 2 0
87 IRAS 18054-2524 Mi* 18 08 34.2391079808 -25 23 30.752788776         16.548 ~ 3 0
88 V* V3792 Sgr bL* 18 08 54.0426253343 -25 28 22.986951481   6.70 6.71     B3/5IV 54 0
89 CD-25 12793B * 18 08 54.9426398038 -25 28 17.197785866   8.82 8.76     B9IV 12 0
90 2MASS J18541928-2358016 * 18 54 19.2835611732 -23 58 01.626592191           ~ 2 0
91 CD-24 14823 * 18 54 38.7536255746 -24 03 21.960384259   12.18 10.93     ~ 1 0
92 TYC 6860-1491-1 ** 18 54 53.1975 -23 57 03.641   11.734 10.598     ~ 2 0
93 2MASS J18550100-2408394 * 18 55 01.0046353302 -24 08 39.450448528           ~ 2 0
94 2MASS J18550303-2355559 * 18 55 03.0220791158 -23 55 55.990626072           ~ 2 0
95 TYC 6860-1664-1 * 18 55 07.5504969250 -23 54 13.551548485   12.19 11.23     ~ 2 0
96 TYC 6860-1711-1 * 18 55 07.8095602522 -24 03 56.409406548   13.14 11.08     ~ 2 0
97 HD 175159 * 18 55 09.9796030800 -24 01 05.640453489   11.21 9.86     K1(III) 5 0
98 2MASS J18551118-2413072 * 18 55 11.1941035496 -24 13 07.103939475           ~ 2 0
99 2MASS J18552223-2412461 ** 18 55 22.2352067547 -24 12 46.193175595           ~ 1 0
100 2MASS J18552401-2349283 ** 18 55 24.0213310367 -23 49 28.333715732           ~ 1 0
101 2MASS J18553233-2412387 ** 18 55 32.3397698371 -24 12 38.602986427           ~ 1 0
102 2MASS J18553293-2359253 * 18 55 32.9292300284 -23 59 25.651304421           ~ 2 0
103 2MASS J18553706-2411230 * 18 55 37.0739035517 -24 11 23.189817755           ~ 2 0
104 2MASS J18553777-2349547 * 18 55 37.7755511767 -23 49 54.865199105           ~ 2 0
105 2MASS J18554220-2415597 * 18 55 42.2046510787 -24 15 59.752502826           ~ 2 0
106 2MASS J18554320-2411418 * 18 55 43.2013331901 -24 11 41.865341235           ~ 2 0
107 2MASS J18554874-2401474 * 18 55 48.7427904518 -24 01 47.488340932           ~ 2 0
108 2MASS J18554945-2400538 * 18 55 49.4519542685 -24 00 53.826676130           ~ 2 0
109 2MASS J18555632-2400073 * 18 55 56.3340909975 -24 00 07.385581115           ~ 1 0
110 2MASS J18555737-2354145 * 18 55 57.3660519406 -23 54 14.559370805           ~ 2 0
111 2MASS J18555913-2403339 * 18 55 59.1382905700 -24 03 33.940742370           ~ 2 0
112 2MASS J18561672-2345402 * 18 56 16.7205335565 -23 45 40.217487113           ~ 1 0
113 2MASS J18561680-2406431 * 18 56 16.8069642505 -24 06 43.222597989           ~ 2 0
114 2MASS J18561788-2358243 * 18 56 17.8837290699 -23 58 24.399789374           ~ 1 0
115 2MASS J18562006-2357173 * 18 56 20.0703519571 -23 57 17.406273414           ~ 2 0
116 2MASS J18563747-2408447 * 18 56 37.4738889736 -24 08 44.785638734           ~ 2 0
117 2MASS J18563774-2410374 * 18 56 37.7463454164 -24 10 37.664033305           ~ 2 0
118 2MASS J18564563-2354023 * 18 56 45.6290454001 -23 54 02.347109845           ~ 2 0
119 2MASS J18564695-2349245 * 18 56 46.9488627839 -23 49 24.507092230           ~ 1 0
120 2MASS J18564920-2400465 * 18 56 49.2123700159 -24 00 46.565261745           ~ 2 0
121 TYC 6860-945-1 * 18 56 53.8746757136 -23 55 14.650990243   12.74 12.08     ~ 2 0
122 2MASS J18565536-2344580 ** 18 56 55.3724128483 -23 44 58.238999753           ~ 1 0
123 2MASS J18565615-2346249 * 18 56 56.1483331656 -23 46 24.921172460           ~ 2 0
124 TYC 6860-909-1 * 18 57 02.6219969816 -24 10 28.366247945   12.72 11.69     ~ 1 0
125 2MASS J18570282-2358475 * 18 57 02.8326598846 -23 58 47.576671339           ~ 2 0
126 2MASS J18570432-2351321 * 18 57 04.3198994151 -23 51 32.174003553           ~ 2 0
127 HD 175601 * 18 57 09.2260187273 -23 51 58.357328666   10.67 10.38 10.29   A1V 8 0
128 HD 175601B * 18 57 09.4596066678 -23 52 07.716575595   11.09 10.56     A(3)V 4 0
129 IRAS 18543-2352 * 18 57 25.0687422674 -23 48 19.269168218           ~ 2 0
130 IRAS 18544-2406 * 18 57 28.5516316783 -24 02 40.200328121           ~ 1 0
131 2MASS J18573272-2343187 * 18 57 32.7250999476 -23 43 18.712184982           ~ 2 0
132 2MASS J18573657-2405454 * 18 57 36.5774213312 -24 05 45.459948453           ~ 1 0
133 2MASS J18574519-2354457 * 18 57 45.2044006902 -23 54 45.672241968           ~ 2 0
134 2MASS J18574575-2349490 * 18 57 45.7576884276 -23 49 49.062362038     11.301     ~ 3 0
135 2MASS J18575364-2400373 * 18 57 53.6459127102 -24 00 37.298825836           ~ 1 0
136 2MASS J18575391-2345582 * 18 57 53.9086162595 -23 45 58.317032282           ~ 2 0
137 HD 175791 ** 18 58 02.761317 -23 37 08.27458   11.17 10.69     G0V 4 0
138 2MASS J18580488-2403296 * 18 58 04.8832489149 -24 03 29.632200743           ~ 2 0
139 IRAS 18551-2344 * 18 58 09.3978115878 -23 40 44.772813018           ~ 2 0
140 2MASS J18580978-2343262 * 18 58 09.7811589347 -23 43 26.295558669           ~ 2 0
141 2MASS J18580998-2355311 * 18 58 09.9862674529 -23 55 31.132046852           ~ 2 0
142 2MASS J18581647-2340114 * 18 58 16.4709448773 -23 40 11.688289236           ~ 2 0
143 HD 175851 * 18 58 16.6145385659 -23 43 55.595452645   10.76 10.26     F2V 4 0
144 2MASS J18581996-2334007 * 18 58 19.9655608826 -23 34 00.797249716           ~ 2 0
145 TYC 6860-1121-1 PM* 18 58 21.6574536941 -23 38 40.657566335   11.91 11.17     ~ 2 0
146 2MASS J18583937-2332312 * 18 58 39.3653866730 -23 32 31.194738626           ~ 2 0
147 IRAS 18558-2354 * 18 58 54.5402740718 -23 49 51.943064781           ~ 2 0
148 TYC 6873-682-1 * 18 58 54.8042950582 -23 29 08.641050567   12.37 11.83     ~ 2 0
149 2MASS J18585553-2329395 * 18 58 55.5393035663 -23 29 39.587362221           ~ 2 0
150 2MASS J18585736-2342464 * 18 58 57.3569932105 -23 42 46.312757355           ~ 2 0
151 2MASS J18585782-2351145 * 18 58 57.8228048466 -23 51 14.573989547           ~ 2 0
152 2MASS J18591262-2346443 * 18 59 12.6266495593 -23 46 44.438507935           ~ 1 0
153 2MASS J18591792-2350546 * 18 59 17.9221155368 -23 50 54.711275280           ~ 2 0
154 TYC 6873-584-1 * 18 59 24.0806481716 -23 41 42.647752075   14.21 11.28     ~ 2 0
155 2MASS J18592411-2335094 * 18 59 24.1201471836 -23 35 09.515298270           ~ 1 0
156 2MASS J18593194-2355053 * 18 59 31.9501848770 -23 55 05.347560771           ~ 2 0
157 2MASS J18593674-2346506 * 18 59 36.7543162897 -23 46 50.672586989           ~ 1 0
158 V* AR Sgr RV* 18 59 42.1482760072 -23 42 26.572531974   10.43 9.61     G4 24 0
159 2MASS J18595396-2334060 * 18 59 53.9650900636 -23 34 06.075270734           ~ 2 0
160 2MASS J18595823-2339176 * 18 59 58.2343660072 -23 39 17.584764562           ~ 2 0
161 2MASS J18595891-2331159 * 18 59 58.9155603412 -23 31 15.861362557           ~ 1 0
162 TYC 6873-739-1 * 19 00 04.4422028935 -23 26 07.491287580   12.66 11.64     ~ 2 0
163 2MASS J19000813-2343368 * 19 00 08.1389217854 -23 43 36.784606828           ~ 1 0
164 2MASS J19001313-2340112 ** 19 00 13.1453605718 -23 40 11.261855656           ~ 1 0
165 2MASS J19001505-2348245 * 19 00 15.0603005560 -23 48 24.504490872           ~ 2 0
166 2MASS J19001602-2349574 ** 19 00 16.0293920440 -23 49 57.523618776           ~ 1 0
167 TYC 6873-1159-1 * 19 00 29.0838986421 -23 40 46.689353916   11.93 11.14     ~ 2 0
168 2MASS J19002919-2323136 * 19 00 29.2019993785 -23 23 13.698699044           ~ 1 0
169 2MASS J19003871-2330374 * 19 00 38.7165688171 -23 30 37.525117238           ~ 2 0
170 CD-23 14943 * 19 00 42.6221791543 -23 26 33.308251852   11.73 10.45     ~ 2 0
171 2MASS J19004442-2339386 * 19 00 44.4395024197 -23 39 38.695579528           ~ 2 0
172 TYC 6873-625-1 * 19 00 47.9744145588 -23 24 05.646614556   12.80 11.29     ~ 2 0
173 HD 176364 * 19 00 50.7542060216 -23 17 22.230539211   10.36 9.36     G8IV 5 0
174 2MASS J19005121-2333311 * 19 00 51.2081123228 -23 33 31.216771279           ~ 1 0
175 TYC 6873-1177-1 ** 19 01 08.8541591508 -23 17 36.933549147   11.96 11.34     ~ 1 0
176 2MASS J19011187-2323074 ** 19 01 11.8714737689 -23 23 07.489271403           ~ 1 0
177 2MASS J19011673-2332578 * 19 01 16.7410950597 -23 32 57.913287870           ~ 2 0
178 2MASS J19012148-2332350 * 19 01 21.4887785112 -23 32 35.164625642           ~ 1 0
179 2MASS J19012308-2342339 * 19 01 23.0819819217 -23 42 34.117458735           ~ 2 0
180 2MASS J19012789-2336241 * 19 01 27.9022839165 -23 36 24.142455393           ~ 2 0
181 TYC 6873-851-1 * 19 01 35.5684453630 -23 16 46.977396518   11.64 11.12     ~ 2 0
182 TYC 6873-564-1 * 19 01 40.6379394505 -23 32 31.424839364   12.88 11.49     ~ 2 0
183 TYC 6873-749-1 * 19 01 52.4298504297 -23 39 27.811251321   12.82 11.40     ~ 2 0
184 2MASS J19015719-2335001 * 19 01 57.2057825321 -23 35 00.200252306           ~ 2 0
185 2MASS J19021893-2330540 * 19 02 18.9355078355 -23 30 54.100926926           ~ 2 0
186 NAME Galactic Bulge reg ~ ~           ~ 3387 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-01:13:41

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