J/ApJ/636/821 Abundances of Baade's Window K giants (Fulbright+, 2006)
Abundances of Baade's Window giants from Keck HIRES spectra.
I. Stellar parameters and [Fe/H] values.
Fulbright J.P., McWilliam A., Rich R.M.
<Astrophys. J., 636, 821-841 (2006)>
=2006ApJ...636..821F 2006ApJ...636..821F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, giant ; Spectroscopy ; Abundances, peculiar
Keywords: Galaxy: abundances - Galaxy: bulge stars: abundances
Abstract:
We present the first results of a new abundance survey of the Milky
Way bulge based on Keck HIRES spectra of 27 K giants in the Baade's
Window (l=1°,b=-4°) field. The spectral data used in this
study are of much higher resolution and signal-to-noise ratio than
previous optical studies of Galactic bulge stars. The [Fe/H] values of
our stars, which range between 1.29 and +0.51, were used to
recalibrate large low-resolution surveys of bulge stars. Our best
value for the mean [Fe/H] of the bulge is -0.10±0.04. This mean
value is similar to the mean metallicity of the local disk and
indicates that there cannot be a strong metallicity gradient inside
the solar circle. The metallicity distribution of stars confirms that
the bulge does not suffer from the so-called G dwarf problem. This
paper also details the new abundance techniques necessary to analyze
very metal-rich K giants, including a new Fe line list and regions of
low blanketing for continuum identification.
Description:
The observations of Baade's Window stars reported here were taken with
the HIRES spectrograph on the Keck I telescope between 1998 and 2001.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 88 44 Star list
table3.dat 32 159 Final line list
table4.dat 37 53 Line list
table5.dat 52 208 Continuum regions
table6.dat 38 6688 Equivalent width measurements
--------------------------------------------------------------------------------
See also:
J/AJ/89/636 : Giant M stars in Baade's Window (Blanco+, 1984)
J/AJ/110/1774 : K giants in Baade's window (Terndrup+ 1995)
J/AJ/112/171 : K Giants in Baade's Window. II (Sadler+ 1996)
J/MNRAS/246/54 : Late-type giants in Baade's window (Sharples+ 1990)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- Star Star name
22- 23 I2 h RAh ? Simbad Hour of Right Ascension (J2000.0)
25- 26 I2 min RAm ? Simbad Minute of Right Ascension (J2000.0)
28- 31 F4.1 s RAs ? Simbad Second of Right Ascension (J2000.0)
33 A1 --- DE- Simbad Sign of the Declination (J2000.0)
34- 35 I2 deg DEd ? Simbad Degree of Declination (J2000.0)
37- 38 I2 arcmin DEm ? Simbad Arcminute of Declination (J2000.0)
40- 41 I2 arcsec DEs ? Simbad Arcsecond of Declination (J2000.0)
43- 48 F6.3 mag Bmag ? Simbad B band magnitude
50- 55 F6.3 mag Vmag ? Simbad V band magnitude
57- 65 A9 --- SpType Simbad MK spectral type
68- 88 A21 --- SName Simbad name
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 0.1nm lambda Wavelength in Angstroms
9- 13 A5 --- Ion Ion designation
15- 18 F4.2 eV EP Excitation potential
20- 24 F5.1 0.1pm EWaBoo ? Measured α Boo equivalent width (1)
26- 30 F5.1 0.1pm EWSun ? Measured solar equivalent width (1)
32 A1 --- Qual [A-E] A subjective quality assessment of the line
(A the highest quality and E the lowest)
--------------------------------------------------------------------------------
Note (1): In milli-Angstroms.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm lambda Wavelength in Angstroms
10- 13 A4 --- Ion Ion designation
15- 19 F5.3 eV EP Excitation potential
21- 26 F6.3 [-] log(gf) Log of the oscillator strength
28- 32 F5.1 0.1pm EW Measured solar equivalent width (1)
34- 37 A4 --- Ref Reference(s) (2)
--------------------------------------------------------------------------------
Note (1): In milli-Angstroms.
Note (2): References as follows:
1 = Bard & Kock (1994A&A...282.1014B 1994A&A...282.1014B) and
Bard et al. (1991A&A...248..315B 1991A&A...248..315B)
2 = Blackwell et al. (1982MNRAS.199...43B 1982MNRAS.199...43B, 1982MNRAS.201..595B 1982MNRAS.201..595B,
1984A&A...132..236B 1984A&A...132..236B, 1986MNRAS.220..549B 1986MNRAS.220..549B, 1995A&A...296..217B 1995A&A...296..217B)
3 = O'Brian et al. (1991, J. Opt. Soc. Am. B, 8, 1185)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.3 0.1nm lambdaS Starting wavelength in Angstroms
10- 17 F8.3 0.1nm lambdaE Ending wavelength in Angstroms
19- 24 F6.4 --- FSun Mean relative solar flux value
26- 31 F6.4 --- F(aBoo) Mean relative α Boo (HR 5340) flux value
33- 38 F6.4 --- F(muLeo) Mean relative µ Leo (HR 3905) flux value
40- 45 F6.4 --- F(I-025) Mean relative Cl* NGC 6522 I-025 flux value
47- 52 F6.4 --- F(IV-003) Mean relative Cl* NGC 6522 IV-003 flux value
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 20 A20 --- Star Star name
22- 28 F7.2 --- lambda Wavelength in Angstroms
30- 34 A5 --- Ion Ion designation
36- 38 I3 0.1pm EW ? Star equivalent width for Ion (mÅ)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jul-2008