1999MNRAS.308..127G

Query : 1999MNRAS.308..127G

1999MNRAS.308..127G - Mon. Not. R. Astron. Soc., 308, 127-139 (1999/September-1)

ISOGAL survey of Baade's Windows in the mid-infrared.

GLASS I.S., GANESH S., ALARD C., BLOMMAERT J.A.D.L., GILMORE G., LLOYD EVANS T., OMONT A., SCHULTHEIS M. and SIMON G.

Abstract (from CDS):

The ISOGAL mid-infrared survey of areas close to the Galactic plane aims to determine the stellar content of those areas, and its possible bearing on the history of the Galaxy. The NGC 6522 and Sgr I Baade's Windows of low obscuration towards the inner parts of the Galactic bulge represent ideal places in which to calibrate and understand the ISOGAL colour-magnitude diagrams, which are more difficult to interpret in heavily reddened fields.

The survey observations were made with the ISOCAM instrument of the ISO satellite. The filter bands chosen were LW2 (∼7µm) and LW3 (∼15µm).

The results presented here show that most of the detected objects are late M-type giants on the asymptotic giant branch (AGB), with a cut-off for those earlier than M3-M4. The most luminous members of these two bulge fields at 7µm are the Mira variables. However, it is evident that they represent the end of a sequence of increasing 15-µm dust emission which commences with M giants of an earlier sub-type.

In observations of late-type M giants, the ISOCAM 15-µm band is mainly sensitive to the cool silicate or aluminate dust shells which overwhelm the photospheric emission. However, in ordinary M-giant stars, the 7-µm band is not strongly affected by dust emission and may be influenced instead by absorption. The ν2 band of water at 6.25µm and the SiO fundamental at 7.9µm are likely contributors to this effect. Miras are more luminous at 7µm and have redder K0-[7] colours than other M giants. Their [7]-[15] colours are consequently bluer than might be expected by extrapolating from warmer M giants.

A group of late-M stars has been found that vary little or not at all, but have infrared colours typical of well-developed dust shells. Their luminosities are similar to those of 200-300 day Miras, but they have slightly redder [7]-[15] colours which form an extension of the ordinary M-giant sequence. They may belong to the class of red semi-regular variables.

The Mira dust shells show a mid-infrared [7]-[15] colour-period relation.

In these two fields there is no component of high-luminosity late-type variables obscured at K and shorter wavelengths such as is seen in the Magellanic Clouds. The upper limit of long-period variable (LPV) periods in these fields remains at approximately 700d.


Abstract Copyright: 1999 RAS

Journal keyword(s): stars: AGB and post-AGB - stars: variables: other - Galaxy: centre - Galaxy: stellar content - - infrared: stars

Nomenclature: Table 2: [GGA99] NGC 6522 NNN N=33 among 497 = ISOGAL-P JHHMMSS.s+DDMMSS N=33. Table 3: [GGA99] Sgr I NNN N=64 among 696 = ISOGAL-P JHHMMSS.s+DDMMSS N=64.

CDS comments: Notes to Tables 2 and 3: B = stars classified by Blanco, 1986 (not BMB).

Simbad objects: 107

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Number of rows : 107
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Sgr I Window reg 17 56 -29.0           ~ 71 0
2 [GGA99] Sgr I 32 AB* 17 58 36.2968024968 -29 08 04.486529688       14.72   ~ 3 0
3 [GGA99] Sgr I 45 AB* 17 58 39.0185686392 -29 05 24.139812012       15.70   ~ 3 0
4 [GGA99] Sgr I 61 AB* 17 58 41.6519662128 -29 03 53.484941124     17.693 14.8 12.434 ~ 6 0
5 [GGA99] Sgr I 65 AB* 17 58 41.9024790360 -29 06 50.878821348       15.32   ~ 5 0
6 [GGA99] Sgr I 69 AB* 17 58 42.3995887176 -29 10 29.391947868     18.642 16.10 13.300 ~ 5 0
7 TLE Sgr I 65 Mi* 17 58 43.7489654880 -29 07 13.199985012     17.524   12.51 ~ 12 0
8 [GGA99] Sgr I 112 AB* 17 58 47.8346991336 -29 10 04.518381216       15.51   ~ 5 0
9 [GGA99] Sgr I 117 AB* 17 58 48.5743577544 -29 07 45.002746416     18.171 15.20 12.936 ~ 7 0
10 [GGA99] Sgr I 129 AB* 17 58 50.1794988096 -29 04 55.738919604     17.546 15.15 12.514 ~ 7 0
11 [GGA99] Sgr I 167 AB* 17 58 54.6505802928 -28 58 33.104498160       13.87 10.338 ~ 5 0
12 HD 316852 * 17 58 54.9122149848 -29 01 20.015905692   11.11 10.15     K0 3 0
13 [GGA99] Sgr I 170 AB* 17 58 55.0440587144 -29 06 28.246836495     19.896 16.21 13.824 ~ 6 0
14 [GGA99] Sgr I 180 AB* 17 58 55.6801571424 -28 58 42.756319380     18.635   13.489 ~ 3 0
15 [GGA99] Sgr I 187 AB* 17 58 56.2209660720 -29 00 51.340736448     19.550 16.46 13.318 ~ 6 0
16 [GGA99] Sgr I 189 AB* 17 58 56.4233569032 -29 02 14.767458144           ~ 2 0
17 [GGA99] Sgr I 200 AB* 17 58 57.2189293344 -29 12 17.728958232     18.636 15.88 13.142 ~ 5 0
18 [GGA99] Sgr I 206 AB* 17 58 57.6607857552 -29 01 15.918596688     18.513 15.35 12.869 ~ 6 0
19 TLE Sgr I 79 Mi* 17 59 00.9943562496 -28 58 23.133413964         13.53 ~ 13 0
20 [GGA99] Sgr I 291 AB* 17 59 04.5390426408 -29 07 45.878690100     19.029 15.43 13.131 ~ 6 0
21 [GGA99] Sgr I 303 AB* 17 59 05.5945692048 -29 02 35.163610584     18.787 16.15 13.206 ~ 5 0
22 [GGA99] Sgr I 328 AB* 17 59 07.2305487312 -29 10 25.614009372       14.02   ~ 6 0
23 [GGA99] Sgr I 338 AB* 17 59 08.1758905176 -29 08 57.188838660     17.270 15.01 12.405 ~ 6 0
24 [GGA99] Sgr I 351 RG* 17 59 09.3915508584 -29 09 04.948745076       11.35   ~ 2 0
25 [GGA99] Sgr I 352 AB* 17 59 09.4244387760 -29 08 26.282973012     16.036 15.20 11.821 ~ 7 0
26 TLE Sgr I 53 Mi* 17 59 10.3044107424 -29 01 30.351852732         13.14 O-rich 15 0
27 [GGA99] Sgr I 365 AB* 17 59 10.4616545184 -29 04 57.916625268     17.454 15.25 12.423 ~ 6 0
28 [GGA99] Sgr I 375 AB* 17 59 10.8727510632 -29 03 15.901163064     18.647 16.50 12.949 ~ 6 0
29 [GGA99] Sgr I 400 AB* 17 59 13.5034854384 -28 58 12.483169068       13.55   ~ 4 0
30 [GGA99] Sgr I 401 AB* 17 59 13.5277625664 -29 11 14.858085696       13.48   ~ 4 0
31 TLE Sgr I 87 Mi* 17 59 13.5422593632 -28 58 53.311121544     18.089   14.98 ~ 12 0
32 [GGA99] Sgr I 405 AB* 17 59 13.8386828256 -29 09 52.616071296     18.529 16.28 13.174 ~ 6 0
33 [GGA99] Sgr I 410 AB* 17 59 14.2405890432 -29 13 36.534377532       13.26   ~ 5 0
34 [GGA99] Sgr I 416 AB* 17 59 14.7485599128 -29 11 30.824473236     18.019 15.86 13.032 ~ 7 0
35 [GGA99] Sgr I 421 AB* 17 59 15.2960585400 -29 01 38.910254808       11.86   ~ 3 0
36 HD 316849 * 17 59 16.6951631664 -29 00 11.594816784   10.89 9.67     K0 13 0
37 [GGA99] Sgr I 446 AB* 17 59 17.6120487072 -28 58 40.835047116     16.646   11.998 ~ 3 0
38 [GGA99] Sgr I 452 AB* 17 59 18.0050997984 -29 14 34.095108264       12.94   ~ 3 0
39 [GGA99] Sgr I 453 AB* 17 59 18.1199936592 -29 01 23.974388580       13.87   ~ 4 0
40 [GGA99] Sgr I 455 AB* 17 59 18.3427431936 -29 05 05.873969796     16.625 15.64 11.858 ~ 6 0
41 [GGA99] Sgr I 457 AB* 17 59 18.4029577080 -29 06 08.440134336     19.122 16.34 13.394 ~ 6 0
42 [GGA99] Sgr I 478 AB* 17 59 20.5746410352 -29 15 07.985362428     17.461 15.34 12.734 ~ 5 0
43 [GGA99] Sgr I 488 AB* 17 59 21.8901434928 -29 12 30.541848696       14.34   ~ 5 0
44 TLE Sgr I 54 Mi* 17 59 23.1903790680 -29 02 16.340487324     19.508   11.94 ~ 18 0
45 TLE Sgr I 39 Mi* 17 59 23.5256401872 -29 12 37.738222488     18.728   13.11 ~ 11 0
46 [GGA99] Sgr I 522 AB* 17 59 24.3074489088 -29 13 59.607749316       13.20   ~ 5 0
47 [GGA99] Sgr I 524 AB* 17 59 24.4491477336 -29 12 37.973928780     18.814 15.88 13.127 ~ 7 0
48 [GGA99] Sgr I 529 AB* 17 59 25.1541614688 -29 03 37.986534468     19.452 16.43 13.646 ~ 6 0
49 [GGA99] Sgr I 540 AB* 17 59 26.2749784248 -29 07 07.393482012       14.38   ~ 6 0
50 [GGA99] Sgr I 541 AB* 17 59 26.3502367200 -29 02 18.377918844     17.886 15.46 12.658 ~ 6 0
51 [GGA99] Sgr I 550 AB* 17 59 27.3279531216 -29 03 10.903572468     19.154   13.314 ~ 5 0
52 [GGA99] Sgr I 556 AB* 17 59 27.7579917192 -29 05 31.369383600     18.235 15.71 12.904 ~ 6 0
53 TLE Sgr I 55 Mi* 17 59 29.6384139312 -29 03 20.594000700     19.216   13.29 ~ 14 0
54 [GGA99] Sgr I 581 AB* 17 59 30.4675906512 -29 09 51.946602012       10.98   ~ 3 0
55 [GGA99] Sgr I 585 AB* 17 59 30.9874744488 -29 08 59.196743304     19.197 16.13 13.439 ~ 6 0
56 [GGA99] Sgr I 601 AB* 17 59 32.6884733832 -29 07 36.216011064       14.56   ~ 3 0
57 HD 316847 * 17 59 33.9082189632 -29 02 38.363555760   11.08 9.74     A2 4 0
58 [GGA99] Sgr I 613 AB* 17 59 34.3240001592 -29 07 03.568512828     18.459   13.217 ~ 5 0
59 [GGA99] Sgr I 626 AB* 17 59 35.9876818968 -29 09 16.684150248       14.76   ~ 5 0
60 [GGA99] Sgr I 633 AB* 17 59 36.8950683024 -29 08 35.622841200     18.067 15.48 12.730 ~ 6 0
61 [GGA99] Sgr I 681 AB* 17 59 44.9839655376 -29 04 43.999206060     17.414   12.435 ~ 4 0
62 TLE Sgr I 57 Mi* 17 59 45.8825944248 -29 03 20.738436660     14.633 13.42 11.965 M3 15 0
63 [GGA99] Sgr I 686 AB* 17 59 46.9811877024 -29 02 27.408949512     17.049   12.433 ~ 4 0
64 TLE Sgr I 56 Mi* 17 59 48.0271289976 -29 03 50.933249712     17.251   11.424 ~ 15 0
65 [GGA99] Sgr I 692 AB* 17 59 49.1740187472 -29 02 48.237800460     18.077   12.839 ~ 3 0
66 [GGA99] NGC 6522 1 RG* 18 02 28.0314898800 -30 00 37.681159140   12.60 10.93 10.35   ~ 1 0
67 TLE NGC 6522 9 Mi* 18 02 34.7847285048 -29 59 58.886317140     19.056   12.455 ~ 16 0
68 V* V1358 Sgr Mi* 18 02 35.0949209040 -29 58 55.828337088       14.11   ~ 7 0
69 [GGA99] NGC 6522 26 AB* 18 02 39.2382437952 -29 56 37.182112512       11.36   ~ 2 0
70 [GGA99] NGC 6522 41 AB* 18 02 42.8905958784 -30 03 36.138030120     19.435 16.88 13.836 ~ 5 0
71 HD 317010 * 18 02 43.5001431864 -30 02 52.304247492   11.902 9.931 9.91 8.534 K7 6 0
72 BMB 7 AB* 18 02 51.1743428400 -30 00 13.689199116     17.481 15.14 12.528 M7 8 0
73 [GGA99] NGC 6522 110 AB* 18 02 56.0575202112 -29 55 34.779475416     18.135 15.20 12.726 ~ 6 0
74 BMB 20 AB* 18 02 56.6977072848 -29 55 46.221927924     15.811 15.37 12.082 M6 6 0
75 V* V1388 Sgr Mi* 18 02 56.8570074744 -30 04 18.324553584           M6 8 0
76 [GGA99] NGC 6522 128 AB* 18 02 57.4694034504 -29 51 25.099523064           ~ 4 0
77 BMB 28 AB* 18 02 59.5106064264 -30 02 54.446390664     17.816 16.12 12.767 M7 20 0
78 V* V1398 Sgr AB* 18 03 01.0519787472 -30 01 42.560456088       14.72   M8.5III: 11 0
79 [GGA99] NGC 6522 170 AB* 18 03 02.2046976096 -29 58 06.891677436         10.000 ~ 5 0
80 V* V1404 Sgr Mi* 18 03 03.3171882120 -29 57 30.467126808     17.331   12.070 M9 24 0
81 BMB 46 AB* 18 03 05.2531454352 -29 55 15.956604192     17.902 15.51 12.738 M7 11 0
82 BMB 41 AB* 18 03 05.5672252224 -30 04 52.517676396           M6 2 0
83 BMB 51 AB* 18 03 06.2214817896 -29 52 04.353178692     18.768 16.42 13.567 M7 8 0
84 BMB 52 Mi* 18 03 07.7731086312 -30 00 34.966064268     19.511   13.507 M9 7 0
85 TLE NGC 6522 403 Mi* 18 03 08.5263105312 -30 05 26.503703736           M8 14 0
86 BMB 56 AB* 18 03 08.5934842608 -30 00 38.965093128     16.912   12.935 M6 3 0
87 BMB 62 AB* 18 03 09.3566557680 -29 52 33.883343400     15.772   12.451 M6 4 0
88 BMB 61 AB* 18 03 09.8217931320 -29 55 06.327766992           M7 5 0
89 TLE NGC 6522 238 Mi* 18 03 11.4697346352 -29 57 47.102808924     18.058   12.564 M7 16 1
90 BMB 64 AB* 18 03 12.5130411576 -30 04 29.569712628     17.534 15.23 12.507 M7 8 0
91 BMB 67 AB* 18 03 13.2780411384 -30 00 56.507661072     19.004 16.41 13.290 M8 8 0
92 BMB 70 AB* 18 03 15.1249190016 -30 07 30.162575640     17.988   12.890 M6.5 5 0
93 BMB 82 AB* 18 03 18.2669846712 -29 56 32.460088596     18.227   14.356 M6 4 0
94 BMB 86 AB* 18 03 18.4002756504 -29 53 46.921692264     17.642 15.81 12.938 M9 11 0
95 BMB 93 AB* 18 03 22.3326595992 -30 02 56.374086516       14.51 11.138 M6 15 0
96 BMB 100 AB* 18 03 24.9645356472 -30 06 56.544758136     16.880 16.23 13.498 M6 4 0
97 BMB 119 AB* 18 03 28.3558256976 -29 55 45.350833404     18.406 16.02 13.141 M9 11 0
98 BMB 120 AB* 18 03 29.3267875297 -29 59 40.031676689     18.710 16.01 13.013 M7 12 0
99 BMB 118 AB* 18 03 30.0431992392 -30 06 23.684345316     16.751 15.16 13.313 M6 5 0
100 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
101 BMB 129 AB* 18 03 31.2078045552 -30 01 01.832192292         10.795 M6.5 12 0
102 BMB 142 AB* 18 03 34.0675295688 -29 59 58.793817012     17.986 15.30 12.574 M8 15 0
103 NGC 6522 GlC 18 03 34.08 -30 02 02.3           ~ 569 0
104 [GGA99] NGC 6522 441 AB* 18 03 35.7266516736 -30 03 02.108212596       13.80 11.298 ~ 3 0
105 BMB 152 AB* 18 03 36.9244400928 -30 01 47.407721952         12.996 M9 10 0
106 BMB 179 AB* 18 03 46.0387736088 -29 59 12.732737244     17.710 15.41 12.479 M7 17 0
107 V* V1460 Sgr AB* 18 03 50.8492165152 -29 56 18.392088264       15.45   M6.5 11 0

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