1998A&A...336..925W

Query : 1998A&A...336..925W

1998A&A...336..925W - Astronomy and Astrophysics, volume 336925-941 (1998/8-3)

Infrared monitoring of OH/IR stars near the Galactic Center.

WOOD P.R., HABING H.J. and McGREGOR P.J.

Abstract (from CDS):

We have monitored 102 fields of size 1'x1' within ∼0.7° of the Galactic Center for 1200 days in the K band. Each field was centered on one of the OH/IR stars found by Lindqvist et al. (1992A&AS...92...43L) Infrared colours J-K, H-K and K-L were also obtained. Periods have been determined for 80 known OH/IR stars, including 5 from Sjouwerman (1997, PhD Thesis, Chalmers Univiersity of Technology) and a further 29 previously unknown long-period variables (LPVs) of large (>0.5mag) K amplitude. The overall period distribution of the variables extends from ∼200 days to ∼1100 days and it is dominated by LPVs with P<600 days. The existence of LPVs with P<300 days indicates the presence of sub-solar metallicity, old, low mass stars near the Galactic Center. These old LPVs have luminosities equal to those of similar LPVs elsewhere in the Galaxy. However, the LPVs with P>300 days near the Galactic Center have lower luminosities and higher wind expansion velocities vexp at a given period than similar stars in the Galactic bulge or solar vicinity, indicating that the metal abundance of Galactic Center stars is ∼2-4 times solar. Another consequence of the observed low luminosities of the Galactic Center LPVs is that the (Mbol, logP) and (K, logP) relations must be metallicity dependent, at least for metallicities of solar or above. The maximum periods and luminosities of Galactic Center LPVs exceed those of bulge LPVs suggesting that there are AGB stars near the Galactic Center which are more massive than any stars in the bulge. AGB masses up to ∼4M☉ are relatively common, with a few AGB stars having masses up to ∼7M☉. There should be ∼1000 main-sequence precursors in the same volume for each of these massive AGB stars. The high expansion velocity (vexp>18km/s) OH/IR stars are separated from the lower expansion velocity OH/IR stars in the (Mbol, logP) diagram: this separation suggests that the stars with higher vexp have higher metallicity, as well as being younger. The overall results suggest that ongoing star formation and metal enrichment have occurred near the Galactic Center.

Abstract Copyright: ∼

Journal keyword(s): stars: AGB and post-AGB - stars: late-type - stars: oscillations - stars: mass-loss - Galaxy: center

Nomenclature: Tables 1, 3: [WHM98] NNN-NNN N=81+29.

Simbad objects: 123

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Number of rows : 123
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 OH 359.508+00.179 OH* 17 43 44.73864 -29 15 44.6328           O-rich 9 0
2 OH 359.513+00.174 OH* 17 43 46.72704 -29 15 38.4444           O-rich 10 0
3 OH 359.889+00.361 OH* 17 43 56.93616 -28 50 30.8040           O-rich 8 0
4 OH 359.748+00.274 OH* 17 43 57.04536 -29 00 28.3572           O-rich 7 0
5 OH 359.487+00.081 OH* 17 44 04.69392 -29 19 53.8428           O-rich 6 0
6 OH 359.4+00.0 OH* 17 44 06.89688 -29 24 16.7796           O-rich 18 1
7 [WHM98] 3-7 Mi* 17 44 07.48 -29 24 45.9           ~ 3 0
8 OH 000.0+00.3 OH* 17 44 14.95464 -28 45 06.0228           O-rich 15 1
9 IRAS 17411-2843 OH* 17 44 19.22928 -28 44 21.7824           O-rich 12 1
10 OH 359.943+00.260 OH* 17 44 28.16184 -28 50 55.9032           O-rich 12 0
11 OH 359.437-00.051 OH* 17 44 28.36752 -29 26 33.7092           O-rich 6 0
12 OH 359.800+00.165 OH* 17 44 30.11016 -29 01 14.3364           O-rich 11 0
13 [WHM98] 41-1 Mi? 17 44 31.34928 -29 01 03.7272           ~ 2 0
14 OH 359.496-00.036 OH* 17 44 33.40968 -29 23 06.1800           O-rich 5 0
15 [WHM98] 7-10 Mi* 17 44 33.858 -29 23 06.73           ~ 4 0
16 OH 359.675+00.069 OH* 17 44 34.32672 -29 10 38.5932           O-rich 24 0
17 OH 359.825+00.153 OH* 17 44 36.48192 -29 00 19.7892           O-rich 13 0
18 [WHM98] 8-10 Mi* 17 44 37.496 -29 23 05.02           ~ 3 0
19 OH 359.502-00.054 OH* 17 44 38.51640 -29 23 22.3440           O-rich 4 0
20 OH 359.598+00.000 OH* 17 44 39.66624 -29 16 46.3764           O-rich 12 0
21 OH 359.765+00.082 OH* 17 44 44.43144 -29 05 37.9176           O-rich 13 0
22 OH 359.890+00.155 OH* 17 44 45.02784 -28 56 57.8004           O-rich 8 0
23 OH 359.760+00.072 OH* 17 44 45.96000 -29 06 13.6296           O-rich 10 0
24 OH 359.755+00.061 OH* 17 44 47.93760 -29 06 49.9284           O-rich 11 0
25 [WHM98] 27-1 Mi* 17 44 51.209 -29 09 22.13           ~ 4 0
26 OH 359.719+00.025 OH* 17 44 51.25032 -29 09 45.3096           O-rich 9 0
27 OH 359.669-00.019 OH* 17 44 54.15768 -29 13 44.8752           O-rich 11 0
28 OH 359.974+00.162 OH* 17 44 55.61736 -28 52 27.0336           O-rich 15 0
29 OH 359.576-00.091 OH* 17 44 57.74424 -29 20 42.4176           O-rich 10 0
30 [WHM98] 78-23 LP* 17 45 02.358 -28 50 54.57           ~ 6 0
31 OH 359.778+00.010 OH* 17 45 03.20016 -29 07 12.6408           O-rich 15 0
32 OH 000.018+00.156 OH* 17 45 03.27792 -28 50 22.8048           O-rich 11 0
33 OH 359.640-00.084 OH* 17 45 05.28600 -29 17 13.4160           O-rich 9 0
34 [WHM98] 18-18 Mi* 17 45 06.353 -29 17 05.10           ~ 5 0
35 OH 359.837+00.030 OH* 17 45 06.89688 -29 03 33.3972           O-rich 16 0
36 [WHM98] 48-3 LP? 17 45 08.03 -29 03 42.6           ~ 5 0
37 OH 359.902+00.061 OH* 17 45 08.83752 -28 59 16.6812           O-rich 11 0
38 OH 359.636-00.108 OH* 17 45 10.39488 -29 18 12.2616           O-rich 11 0
39 OH 000.200+00.233 OH* 17 45 11.45352 -28 38 38.5332           O-rich 12 0
40 OH 000.173+00.211 OH* 17 45 12.45192 -28 40 44.3892           O-rich 10 0
41 OH 359.716-00.070 OH* 17 45 12.91632 -29 12 54.6732           O-rich 9 0
42 OH 359.763-00.042 OH* 17 45 13.06800 -29 09 36.3276           O-rich 13 0
43 OH 359.681-00.095 OH* 17 45 13.85256 -29 15 28.6524           O-rich 12 0
44 OH 359.803-00.021 OH* 17 45 13.87752 -29 06 55.4040           O-rich 9 0
45 OH 359.797-00.025 OH* 17 45 14.26896 -29 07 20.7516           O-rich 13 0
46 [WHM98] 34-63 Mi* 17 45 14.41 -29 09 18.5           ~ 8 0
47 OH 359.684-00.104 OH* 17 45 16.42752 -29 15 37.6128           O-rich 9 0
48 OH 359.652-00.131 OH* 17 45 18.04320 -29 18 03.9060           O-rich 7 0
49 [WHM98] 60-1 Mi* 17 45 18.299 -28 58 39.31           O-rich 8 0
50 OH 359.924+00.034 OH* 17 45 18.93840 -28 58 57.5436           O-rich 12 0
51 OH 359.711-00.100 OH* 17 45 19.33680 -29 14 05.7876           O-rich 15 0
52 OH 000.221+00.168 OH* 17 45 29.01792 -28 39 38.5344           O-rich 9 0
53 OH 359.634-00.195 Mi* 17 45 30.45336 -29 21 00.0000           O-rich 7 0
54 [WHM98] 13-15 Mi* 17 45 31.92264 -29 25 00.2640           ~ 4 0
55 OH 359.888-00.051 OH* 17 45 33.22896 -29 03 29.1924           O-rich 9 0
56 OH 359.6-00.2 OH* 17 45 33.515 -29 25 08.51           O-rich 13 1
57 OH 000.083+00.064 OH* 17 45 34.25280 -28 49 55.9992           O-rich 10 0
58 OH 359.855-00.078 OH* 17 45 34.78560 -29 06 02.6784           O-rich 18 0
59 OH 359.955-00.031 OH* 17 45 37.90920 -28 59 26.4516           O-rich 13 0
60 OH 359.911-00.059 OH* 17 45 38.29896 -29 02 32.0352           O-rich 5 0
61 OH 359.918-00.056 OH* 17 45 38.46048 -29 02 03.9408           O-rich 16 0
62 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
63 OH 359.947-00.046 OH? 17 45 40.281 -29 00 16.34           O-rich 3 0
64 OH 359.94-00.05 OH* 17 45 40.61208 -29 00 55.5084           O-rich 23 0
65 OH 359.946-00.047 OH* 17 45 40.63 -29 00 23.5           O-rich 65 0
66 OH 359.932-00.059 OH* 17 45 41.39208 -29 01 26.7636           O-rich 10 0
67 OH 359.932-00.063 OH* 17 45 42.10968 -29 01 37.6896           O-rich 18 0
68 OH 359.965-00.043 OH* 17 45 42.34752 -28 59 17.8116           O-rich 8 0
69 [WHM98] 69-1 Mi* 17 45 42.884 -28 59 02.27           O-rich 9 0
70 OH 359.970-00.049 OH* 17 45 44.31912 -28 59 13.2720           O-rich 15 0
71 OH 000.352+00.175 OH* 17 45 46.56648 -28 32 39.5016           O-rich 7 0
72 OH 359.814-00.162 OH* 17 45 48.48240 -29 10 45.1992           O-rich 11 0
73 OH 359.986-00.061 OH* 17 45 49.40544 -28 58 49.4400           O-rich 28 0
74 OH 359.999-00.061 OH* 17 45 51.27024 -28 58 07.4316           O-rich 8 0
75 OH 000.189+00.052 OH* 17 45 51.90744 -28 44 51.4680           O-rich 17 0
76 OH 359.768-00.207 OH* 17 45 52.62048 -29 14 30.4188           O-rich 8 0
77 [WHM98] 36-3 Mi? 17 45 53.170 -29 14 40.62           ~ 2 0
78 [WHM98] 72-57 Mi* 17 45 53.35 -29 00 33.6           ~ 5 0
79 [WHM98] 75-6 AB* 17 45 53.40 -28 58 13.1           O-rich 6 0
80 OH 000.38+00.13 OH* 17 45 54.18120 -28 31 45.9984           O-rich 17 0
81 OH 359.977-00.087 OH* 17 45 54.31368 -29 00 02.7576           O-rich 16 0
82 [WHM98] 72-2 LP* 17 45 54.66 -28 59 53.5           ~ 5 0
83 OH 000.274+00.086 OH* 17 45 56.08416 -28 39 27.4644           O-rich 7 0
84 [WHM98] 70-5 AB* 17 45 58.89 -29 01 12.5           O-rich 5 0
85 OH 000.007-00.088 OH* 17 45 58.90128 -28 58 35.0220           O-rich 11 0
86 OH 000.053-00.062 OH* 17 45 59.47152 -28 55 23.6316           M5-M9III-V 18 0
87 OH 000.129-00.020 OH* 17 46 00.25392 -28 50 11.7780           O-rich 14 0
88 OH 359.97-00.12 OH* 17 46 00.92304 -29 01 23.2428           O-rich 22 0
89 OH 000.134-00.023 OH* 17 46 01.60032 -28 50 00.6072           O-rich 13 0
90 OH 000.217+00.023 OH* 17 46 02.86392 -28 44 20.6736           O-rich 10 0
91 [WHM98] 103-7 Mi* 17 46 04.79 -28 44 00.2           ~ 4 0
92 [WHM98] 51-85 V* 17 46 06.3 -29 09 30           ~ 2 0
93 OH 359.803-00.248 OH* 17 46 07.26240 -29 13 58.9548           O-rich 7 0
94 OH 000.113-00.060 OH* 17 46 07.42968 -28 52 16.8384           O-rich 12 0
95 OH 359.873-00.209 OH* 17 46 08.09184 -29 09 14.5836           O-rich 10 0
96 OH 359.996-00.144 OH* 17 46 10.31472 -29 00 51.4440           O-rich 7 0
97 [WHM98] 74-2 LP* 17 46 10.375 -29 00 43.39           ~ 7 0
98 OH 000.349+00.053 OH* 17 46 14.47536 -28 36 39.5388           O-rich 12 0
99 OH 000.241-00.014 OH* 17 46 14.96208 -28 44 17.3400           O-rich 12 0
100 OH 000.225-00.055 OH* 17 46 22.11192 -28 46 22.6092           O-rich 12 0
101 OH 000.036-00.182 OH* 17 46 24.86688 -29 00 01.4076           O-rich 12 0
102 OH 000.180-00.098 OH* 17 46 25.84272 -28 50 00.1536           O-rich 12 0
103 [WHM98] 94-4 AB* 17 46 28.014 -28 53 38.34           O-rich 5 0
104 OH 000.138-00.136 OH* 17 46 28.70808 -28 53 19.4856           O-rich 17 0
105 OH 000.452+00.046 OH* 17 46 30.71448 -28 31 32.8080           O-rich 7 0
106 OH 000.336-00.027 OH* 17 46 31.22688 -28 39 48.6756           O-rich 8 0
107 [WHM98] 121-6 Mi? 17 46 31.279 -28 31 06.41           ~ 2 0
108 OH 000.395+00.008 OH* 17 46 31.68048 -28 35 41.0532           O-rich 7 0
109 OH 000.265-00.078 OH* 17 46 33.11640 -28 45 00.7200           O-rich 9 1
110 OH 359.7-00.4 OH* 17 46 35.60496 -29 21 51.4188           O-rich 13 1
111 OH 000.453+00.026 OH* 17 46 35.62944 -28 32 08.0052           O-rich 5 0
112 [WHM98] 122-11 Mi* 17 46 37.317 -28 32 25.61           ~ 5 0
113 [WHM98] 39-1 Mi* 17 46 37.64064 -29 19 28.3332           ~ 4 0
114 OH 359.8-00.4 OH* 17 46 38.12064 -29 19 30.6768           O-rich 15 1
115 OH 000.447-00.006 OH* 17 46 42.29064 -28 33 26.1324           K1.5-M9III-V 10 0
116 OH 000.261-00.143 OH* 17 46 47.80680 -28 47 15.1620           O-rich 10 0
117 OH 000.307-00.176 OH* 17 47 02.16864 -28 45 55.7892           O-rich 7 0
118 [WHM98] 49-3 Mi? 17 47 19.516 -29 20 31.51           ~ 2 0
119 OH 000.437-00.179 OH* 17 47 21.28272 -28 39 22.8420           O-rich 6 0
120 OH 359.851-00.533 OH* 17 47 21.33648 -29 20 24.4752           O-rich 4 0
121 OH 000.536-00.130 OH* 17 47 24.01584 -28 32 42.9324           O-rich 7 0
122 OH 000.523-00.206 OH* 17 47 39.64992 -28 35 46.7808           O-rich 6 0
123 [WHM98] 126-1 Mi? 17 47 39.974 -28 35 24.04           ~ 2 0

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