J/A+AS/97/587 JHK photometry of Galactic center stars (Ruelas-Mayorga+ 1993)
Distribution and studies of the infrared stellar population in the Galaxy.
V. Other clear regions around the galactic centre.
Ruelas-Mayorga R.A., Teague P.F.
<Astron. Astrophys. Suppl. Ser. 97, 587 (1993)>
=1993A&AS...97..587R 1993A&AS...97..587R (SIMBAD/NED BibCode)
ADC_Keywords: Populations, stellar; Photometry, infrared ; Infrared sources
Keywords: Galaxy: centre - galaxy: stellar content
Abstract:
We present K-counts and JHK detailed photometry for a number of stars
with K≤+9.0 in three clear regions near the galactic centre. These
regions are all located approximately at l∼0.0 and at latitudes
b~-3.5,-4.0 and 4.5 respectively. Their Cumulative Counts Functions
(CCF's) are formed, and with the aid of an exponential disk model for
the Galaxy they are separated into disk and bulge CCF. As for the case
in Baade's Window (BW) (Ruelas-Mayorga & Teague, 1992A&AS...95..379R 1992A&AS...95..379R)
the disk is dominant at bright magnitudes whereas the bulge
dominates at the faint end of the CCF. The slope of the bulge CCF is
steeper than that for the disk in all three cases corroborating the
result obtained for BW. The two colour JHK diagram and the K vs J-K
diagram for the three regions show that the stellar population in
these areas is similar to that studied in BW by us and by Frogel &
Whitford (1987ApJ...320..199F 1987ApJ...320..199F). An average value of E(J-K)∼0.42mag for
the reddening is obtained, which is somewhat larger than that found
for BW (0.27). Finally it is shown that at K≤+9.0, the disk
population may be accounted for by those sources with J-K≤+1.6
whereas the bulge population presents values for J-K in excess
of +1.6.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 55 16 Cumulative Counts Functions (CCF) values
table2 93 69 Observed values for the JHK photometry of
sources in regions R1, R2 and R3
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See also:
J/A+AS/93/61 : IR Stellar Population in Baade's window (Ruelas-Mayorga+ 1992)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 2 A2 --- Region Region (1)
4- 7 F4.1 mag Kmagup K magnitude up to which the number of
sources has been measured
9- 11 I3 --- Nsources Cumulative number of sources observed
13- 19 F7.2 --- Corr Corrected number of observed sources
21- 28 F8.2 ct/deg+2 Ndisk Number of sources per square degree (N)
in the disk
30- 34 F5.3 [ct/deg+2] logNdisk LogNdisk
36- 40 F5.3 [ct/deg+2] logNdisk2 Model-predicted logarithm of Ndisk (2)
42- 45 F4.2 [ct/deg+2] logNbulge logarithm of N for the bulge component
47- 50 F4.2 [ct/deg+2] logNbulge(BW) logarithm of N derived from the Baade
Window bulge CCF and the r1/4 law
52- 55 F4.2 [ct/deg+2] logMean logarithm of the mean of
logNbulge and logNbulge(BW)
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Note (1): R1: (l,b)=(0.0,-3.5); R2: (l,b)=(0.0,-4.0), R3: (l,b)=(0-0,-4.5)
Note (2): Disk parameters:
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Region Area Ro a(abs) h(abs) aK
deg2 kpc kpc kpc mag/kpc
----------------------------------------------
R1 0.03857 8.75 4.0 0.1 0.046
R2 0.01563 8.75 4.0 0.1 0.056
R3 0.05143 8.75 4.0 0.1 0.053
----------------------------------------------
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 2 A2 --- Region Region designation
4- 11 A8 --- Object Object designation
13- 14 I2 h RAh Right ascension (1950)
16- 17 I2 min RAm Right ascension (1950)
19- 22 F4.1 s RAs Right ascension (1950)
24 A1 --- DE- Declination
25- 26 I2 deg DEd Declination (1950)
28- 29 I2 arcmin DEm Declination (1950)
31- 32 I2 arcsec DEs Declination (1950)
34- 38 F5.2 mag Jmag J magnitude
40- 43 F4.2 mag e_Jmag ? rms uncertainty on Jmag (1)
45- 48 F4.2 mag Hmag H magnitude
50- 53 F4.2 mag e_Hmag ? rms uncertainty on Hmag (1)
55- 58 F4.2 mag Kmag K magnitude
60- 63 F4.2 mag e_Kmag ? rms uncertainty on Kmag (1)
65- 68 F4.2 mag J-H J-H colour index
70- 73 F4.2 mag e_J-H ? rms uncertainty in J-H
75- 78 F4.2 mag H-K H-K colour index
80- 83 F4.2 mag e_H-K ? rms uncertainty in H-K
85- 88 F4.2 mag J-K J-K colour index
90- 93 F4.2 mag e_J-K ? rms uncertainty in J-K
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Note (1): When no error is shown, the observational error is 0.02 mag or smaller
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History: Prepared via OCR at CDS.
References:
Ruelas-Mayorga, Paper II., 1991RMxAA..22...43R 1991RMxAA..22...43R
Ruelas-Mayorga & Teague, Paper III., 1992A&AS...93...61R 1992A&AS...93...61R, Cat. J/A+AS/93/61
Ruelas-Mayorga & Teague, Paper IV., 1992A&AS...95..379R 1992A&AS...95..379R
(End) James Marcout, Patricia Bauer [CDS] 19-Jun-1997