The Metallicity and Reddening of Stars in the Inner Galactic Bulge

42 Pages·0.33 MB·English

by  Jay A. Frogel

Table 1. Log of Observations
Field Center (2000)
Subfield Name or Offset Date J Exposures K Exposures Notes
h m s ◦ ′ ′′
c1a (g0.0-0.8) 17 48 16.6 −29 2137 920714 5×30 sec 5×(1,10 sec)
′′ ′′ ′′
c1a2 5×1 5×1 repeat 1a
′′ ′′
9 c1a3 920715 5×1 5×1 repeat 1a
′′ ′
9 c1b 1 N 920714 5×(1,30) 5×(1,10)
9 c1b2 ′′ ′′ ′′ 5×1 5×1 repeat 1b
1

n c2a (g359.7-0.2) 17 45 24.8 -29 15 48 930706 5×5; 10×60 5×(1,20)
a c2b ′′ 1′ N ′′ 5×(5,60) 5×1
J

2
c3a (g0.2+0.1) 17 45 06.0 -28 41 18 930707 5×(5,60) 5×(1,3)
2
′′ ′ ′′
c3b 1 N 5×5 5×(1,3)

1
v g0-1.3a 17 50 43.5 -29 36 27 920714 5×(1,30) 5×(1,10)
8 g0-1.3b 5.1s W ′′ ′′ 5×(1,30) 5×(1,10)
2
3
g0-1.8a 17 52 42.3 -29 51 45 920714 5×(1,30) 5×(1,10)
1
s ′′ ′′
0 g0-1.8b 5 W 5×(1,30) 5×(1,10)
9
9 g0-2.3a 17 54 41.8 -30 06 56 920714 5×(1,30) 5×(1,10)
/ s ′′ ′′
h g0-2.3b 5 W 5×(1,30) 5×(1,10)
p
- g0-2.8a 17 56 41.9 -30 22 00 920714 5×(1,30) 5×(1,10)
o
′′ ′′
r g0-2.8a2 920715 5×1 5×1 Repeat -2.8a
t s ′′
s g0-2.8b 5.3 W 920714 5×(1,30) 5×(1,10)
a g0-2.8b2 ′′ ′′ 920715 5×(1,10) 5×(1,10)
: ′′ ′′ ′′
v g0-2.8c2 70 N of b 5×1 5×1 g0-2.8c not usable
i g0-2.8d2 0s E-W ′′ ′′ 5×(1,10) 5×(1,10) there is no g0-2.8d
X
r
a g1-1.3a 17 53 03.5 -28 44 50 920715 5×(1,30) 5×(1,10)
g2-1.3a 17 55 21.4 -27 53 06 920715 5×(1,30) 5×(1,10)
s ′′
g2-1.3b 5 E 920718 5×(1,10) 5×(1,10)
g3-1.3a 17 57 37.2 -27 01 13 920718 5×(1,30) 5×(1,10)
s ′′ ′′
g3-1.3b 5.2 E 5×(1,10) 5×(1,10)
g4-1.3a 17 59 51.0 -26 09 14 920718 5×(1,30) 5×(1,10)
s ′′ ′′
g4-1.3b 5.3 W 5×(1,10) 5×(1,10)
′′ ′′ ′′
g4-1.3c 70 S of b 5×1 5×1
s ′′ ′′
g4-1.3d 0 E-W 5×1 5×1
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Table 2. Reddening
Error Lower K
Subfield AK E(J −K) hAKi σ in Mean Limit
(1) (2) (3) (4) (5) (6) (7)
c1a 1.06±0.07 1.71±0.12 11.70
c1a2 1.00±0.08 1.62±0.12 11.77
9 c1a3 1.05±0.13 1.69±0.22 —
9
c1b 1.03±0.09 1.67±0.14 12.10
9
c1b2 1.02±0.09 1.65±0.15 1.03 0.02 0.04 11.40
1

n
c2a 2.11±0.15 3.42±0.24 11.60
a
J c2b 2.19±0.17 3.54±0.28 2.15 0.06 0.11 11.60

2
2 c3a 1.94±0.14 3.13±0.23 11.70
c3b 1.82±0.15 2.95±0.24 1.88 0.08 0.10 —

1
v
g0-1.3a 0.51±0.06 0.82±0.09 —
8
2 g0-1.3b 0.47±0.06 0.76±0.09 0.49 0.03 0.04 —
3
1 g0-1.8a 0.35±0.05 0.57±0.07 —
0
g0-1.8b 0.33±0.05 0.53±0.09 0.34 0.01 0.04 —
9
9
/ g0-2.3a 0.27±0.06 0.44±0.09 —
h
g0-2.3b 0.27±0.04 0.44±0.07 0.27 0.00 0.04 —
p
-
o g0-2.8a 0.38±0.05 0.62±0.08 —
r g0-2.8a2 0.39±0.07 0.63±0.11 —
t
s g0-2.8b 0.38±0.06 0.62±0.09 —
a
: g0-2.8b2 0.41±0.05 0.66±0.08 —
v
g0-2.8c2 0.43±0.08 0.69±0.14 —
i
X g0-2.8d2 0.41±0.06 0.66±0.09 0.40 0.02 0.03 —
r
a
g1-1.3a 0.43±0.06 0.70±0.10 0.43 — 0.06 —
g2-1.3a 0.46±0.07 0.74±0.12 —
g2-1.3b 0.50±0.07 0.81±0.11 0.48 0.03 0.05 —
g3-1.3a 0.56±0.10 0.91±0.16 —
g3-1.3b 0.59±0.07 0.95±0.11 0.58 0.02 0.06 —
g4-1.3a 0.59±0.10 0.95±0.16 —
g4-1.3b 0.55±0.10 0.89±0.16 —
g4-1.3c 0.57±0.19 0.92±0.30 —
g4-1.3d 0.48±0.20 0.78±0.33 0.55 0.05 0.08 —
1

Table 3. Giant Branch Slopes and Metallicity
9 GB Error
9 Subfield N Slopea Intercept [Fe/H] h[Fe/H]i σ in Mean
9
(1) (2) (3) (4) (5) (6) (7) (8)
1

n c1a3 66 −0.133±0.042 2.225±0.310 0.12±0.57
a
c1b 47 −0.108±0.022 1.970±0.220 −0.22±0.30 -0.15 0.24 0.46
J

2
g0-1.3a 97 −0.116±0.008 2.028±0.092 −0.11±0.11
2
g0-1.3b 93 −0.112±0.009 2.001±0.098 −0.17±0.12 -0.14 0.04 0.12

1
v g0-1.8a 59 −0.111±0.010 1.992±0.106 −0.18±0.14
8
g0-1.8b 58 −0.119±0.011 2.073±0.129 −0.07±0.15 -0.13 0.08 0.14
2
3
1 g0-2.3a 56 −0.117±0.013 2.044±0.149 −0.10±0.18
0 g0-2.3b 37 −0.092±0.012 1.737±0.140 −0.44±0.16 -0.28 0.24 0.17
9
9
g0-2.8a2 48 −0.092±0.015 1.764±0.176 −0.44±0.20
/
h g0-2.8b2 47 −0.118±0.013 2.067±0.151 −0.09±0.18
p g0-2.8c2 50 −0.096±0.021 1.798±0.234 −0.39±0.29
-
g0-2.8d2 50 −0.105±0.013 1.913±0.148 −0.26±0.18 -0.26 0.16 0.18
o
r
t
s g1-1.3a 82 −0.100±0.009 1.855±0.100 −0.33±0.12 -0.33 — 0.12
a
:
v g2-1.3a 68 −0.085±0.014 1.686±0.158 −0.53±0.19
i g2-1.3b 67 −0.112±0.011 2.001±0.123 −0.17±0.15 -0.31 0.26 0.17
X
r
a g3-1.3a 65 −0.117±0.018 2.048±0.209 −0.10±0.25
g3-1.3b 56 −0.159±0.016 2.519±0.176 0.47±0.22 0.22 0.40 0.23
g4-1.3a 62 −0.097±0.018 1.821±0.201 −0.37±0.25
g4-1.3b 34 −0.148±0.020 2.406±0.221 0.32±0.27 -0.06 0.49 0.18
aGB slope ≡∆(J −K)/∆K.
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arXiv:astro-ph/9901328v1 22 Jan 1999
.
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Table 4. Metallicity and Latitude
Giant Branch
a b
Field b Slope h[Fe/H]i
c1 -0.8 — −0.15±0.46
g013 -1.3 — −0.14±0.12
g018 -1.8 — −0.13±0.14
g023 -2.3 — −0.28±0.14
g028 -2.8 — −0.26±0.18
Liller 1 -0.20 −0.135±0.009 0.15±0.12
Terzan 2 -2.30 −0.127±0.014 0.04±0.19
BW3 -2.70 −0.108±0.013 −0.22±0.18
BW4 -3.90 −0.113±0.005 −0.15±0.07
BW6 -6.00 −0.098±0.007 −0.36±0.10
BW8 -8.00 −0.082±0.010 −0.58±0.14
BW10 -10.25 −0.086±0.014 −0.52±0.19
aGiant branch slopes from Tiede et al. (1995)
bTiede et al. (1995) values have been recalculated
with Equation 3.
2