Access to Astronomical Catalogues

← Click to display the menu
J/AJ/110/2788       JHK photometry for Galactic bulge stars (Tiede+ 1995)

Implications of new JHK photometry and a deep infrared luminosity function for the galactic bulge. Tiede G.P., Frogel J.A., Terndrup D.M. <Astron. J. 110, 2788 (1995)> =1995AJ....110.2788T (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, infrared Description: We present deep near-IR photometry for Galactic bulge stars in Baade's Window, (l, b)=(1.0deg, -3.9deg), and another minor axis field at (l, b)=(0deg, -6deg). We combine our data with previously published photometry and construct a luminosity function over the range 5.5=<K0=<16.5, deeper than any previously published. The slope of this luminosity function and the magnitude of the tip of the first ascent giant branch are consistent with theoretical values derived from isochrones with appropriate age and metallicity. We use the relationship between [Fe/H] and the giant branch slope derived from near-IR observations of metal-rich globular clusters by Kuchinski et al. (1995AJ....109.1131K) to calculate the mean metallicity for several bulge fields along the minor axis. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 43 172 BW4a data table4.dat 56 509 BW4b data table5.dat 43 131 BW6 data table6.dat 49 40 Summary of the BW4 artificial frame tables.tex 151 1203 LaTeX version of the tables
See also: J/ApJ/353/494 : JHKL photometry on Galactic bulge M Giants (Frogel+, 1990) Byte-by-byte Description of file: table3.dat table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Id Identification number 5- 9 F5.1 pix Xpos X position 11- 15 F5.1 pix Ypos Y position 17- 22 F6.3 mag K0 K0 magnitude 24- 29 F6.3 mag (J-K)0 ? (J-K)0 color index 31- 36 F6.3 mag (H-K)0 ? (H-K)0 color index 38- 43 A6 --- Note Notes
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Id Identification number 5- 9 F5.1 pix Xpos X position 11- 15 F5.1 pix Ypos Y position 17- 22 F6.3 mag K0 K0 magnitude 24- 29 F6.3 mag (J-K)0 ? (J-K)0 color index 31- 36 F6.3 mag (H-K)0 ? (H-K)0 color index 38- 43 F6.3 mag V0 ? V0 magnitude 45- 49 F5.3 mag (V-I)0 ? (V-I)0 color index 51- 56 A6 --- Note Notes
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 F5.2 mag Kmag0 K magnitude range: lower limit 6 A1 --- --- [-] 7- 11 F5.2 mag Kmag1 K magnitude range: upper limit 13- 15 I3 --- NInput Number of stars Input 17- 18 I2 --- NDetect Number of stars Detected 20- 24 F5.1 % Complet Percent complete 26- 30 F5.3 mag DKmag ? Absolute average K magnitude difference 32- 36 F5.3 mag e_DKmag ? rms uncertainty on DKmag 38- 43 F6.3 mag DMag ? Mean difference 45- 49 F5.3 mag e_DMag ? rms uncertainty on DMag
Table 1: Field coordinates and adopted reddening values ------------------------------------------------------------- Field RA (1950) DE A(K) E(H-K) E(J-K) A(V) E(V-I) ------------------------------------------------------------- BW4a 18 00 12 -29 59 54 0.14 0.09 0.26 BW4b 18 00 33 -30 02 36 0.14 0.09 0.26 1.46 0.65 BW6 18 08 41 -31 51 55 0.12 0.08 0.22 Table 2: Journal of observations -------------------------------------------------- Field # of frame x Exposure Calibration (sec) Uncertainty J H K J H K -------------------------------------------------- BW4b 5 x 3 5 x 3 5 x 3 0.005 0.004 0.004 BW4a 4 x 3 5 x 3 5 x 3 0.030 0.029 0.061 BW4a 5 x 1 0.052 BW4b 5 x 3 5 x 3 5 x 3 0.056 0.048 0.097 BW4b 5 x 3 5 x 3 4 x 3 0.046 0.051 0.045 BW4b 9 x 60 18 x 30 41 x 20 0.028 0.051 0.037 BW4b 10 x 60 29 x 20 0.034 0.016 BW4b 18 x 20 0.031 BW6 10 x 10 10 x 10 3 x 10 0.024 0.021 0.028 BW6 15 x 150 15 x 150 50 x 45 0.041 0.038 0.042 Table 7: Giant branch slopes (solutions to (J-K)=b+a x K) and derived [Fe/H] --------------------------------------------------------------- Field Intercept Slope [Fe/H] |b| --------------------------------------------------------------- Liller 1 -0.135 ± 0.009 0.26 ± 0.38 0.20 Terzan 2 3.200 ± 0.180 -0.127 ± 0.014 0.07 ± 0.42 2.30 BW3 1.972 ± 0.123 -0.108 ± 0.013 -0.42 ± 0.33 2.70 BW4 2.001 ± 0.052 -0.113 ± 0.005 -0.28 ± 0.16 3.90 BW6 1.867 ± 0.065 -0.098 ± 0.007 -0.65 ± 0.18 6.00 BW8 1.733 ± 0.092 -0.082 ± 0.010 -1.05 ± 0.30 8.00 BW10 1.766 ± 0.135 -0.086 ± 0.014 -0.96 ± 0.37 10.25 BW12 1.937 ± 0.105 -0.108 ± 0.011 -0.40 ± 0.27 12.50 --------------------------------------------------------------- Table 8. Metallicity for various latitudes. ------------------------------------------------------------- Mean metallicities <[Fe/H]> from: --------------------------------------------- Field |b| This Terndrup Frogel Tyson McWilliam Average study (1988) (1990) (1991) (1994) ------------------------------------------------------------- Liller 1 0.20 0.26 0.26 error 0.38 0.38 Terzan 2 2.30 0.07 0.07 error 0.42 0.42 BW3 2.70 -0.42 0.20 -0.41 -0.21 error 0.33 0.20 0.76 0.17 BW4 3.90 -0.28 -0.17 0.04 -0.19 -0.27 -0.17 error 0.16 0.13 0.22 0.70 0.40 0.09 BW6 6.00 -0.65 -0.40 -0.09 0.21 -0.23 error 0.18 0.09 0.16 0.60 0.07 BW8 8.00 -1.05 -0.60 -0.02 -0.74 -0.60 error 0.30 0.11 0.23 1.00 0.09 BW10 10.25 -0.96 -0.88 -0.20 -0.38 -0.61 error 0.37 0.12 0.21 0.71 0.10 BW12 12.50 -0.40 -0.22 -1.02 -0.55 error 0.27 0.22 0.54 0.16 BW17 17.30 -1.35 -1.35 error 0.30 0.30 ------------------------------------------------------------- Slope -0.060 -0.113 -0.038 -0.094 -0.071 error 0.033 0.004 0.010 0.019 0.017 ------------------------------------------------------------- Notes on columns: Terndrup (1988): <[Fe/H]> values have been lowered by -0.15 to correct to R0=8.0Kpc (as suggested in Terndrup 1988) Frogel et al. (1990): <[Fe/H]> values had the 30% correction applied as suggested in Frogel et al. (1990). Tyson (1991): Tyson (1991) calibrated his values using a subset of the bulge stars from Rich (1988). McWilliam & Rich (1994) has since recalibrated these stars, lowering the average [Fe/H] by -0.32. This correction was applied to the values from Tyson (1991). Average: The Average is an unweighted mean since the uncertainties from the studies were not calculated identically. The uncertainty in the Average is the formal standard deviation in the mean. Slope: This line contains Slope in dex/degree. Slopes and associated uncertainties were calculated by least squares fits through the data points. The Average is a least squares fit through all of the data points combined. Table 9: Studies determining Y (Helium abundance) for bulge stars ----------------------------------------------------------------------------- Reference Y Notes ----------------------------------------------------------------------------- This Study 0.30 ±0.03 Without first ascent bump correction (R' method) 0.27 ±0.03 With first ascent bump correction (R' method) Terndrup (1988) 0.32 ±0.05 Including blue HB stars (R method) 0.30 ±0.05 Excluding blue HB stars (R method) Minniti (1995) 0.28 ±0.02 Including an AGB Correction (R' method) Renzini (1994) 0.30 - 0.35 (Rc method) Davidge (1991) ∼0.12 Davidge only reports an R and R' value not a Y. ----------------------------------------------------------------------------- Courtesy: Glenn Tiede References: Frogel J.A. et al., 1990, ApJ 353, 494 =Cat J/ApJ/353/494 McWilliam A. & Rich R.M., 1994, ApJS 91, 749 =1994ApJS...91..749M Rich R.M., 1988, AJ 95, 828 =1988AJ.....95..828R Terndrup D.M., 1988, AJ 96, 884 =1988AJ.....96..884T Tyson N.D., 1991, ApJ 373, L1 =1991ApJ...373L...1T
(End) Patricia Bauer [CDS] 07-Aug-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact