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J/AJ/126/1362       Century Survey Galactic Halo Project. I. (Brown+, 2003)

The Century Survey Galactic Halo Project. I. Stellar spectral analysis. Brown W.R., Allende Prieto C., Beers T.C., Wilhelm R., Geller M.J., Kenyon S.J., Kurtz M.J. <Astron. J. 126, 1362 (2003)> =2003AJ....126.1362B
ADC_Keywords: Milky Way ; Stars, blue ; Photometry ; Abundances, [Fe/H] ; Radial velocities Keywords: Galaxies: halo - Galaxy: stellar content - stars: abundances - stars: horizontal-branch Abstract: The Century Survey Galactic Halo Project is a photometric and spectroscopic survey from which we select relatively blue stars (V-R<0.30mag) as probes of the Milky Way halo. The survey strip spans the range of Galactic latitude 35°<b<88°, allowing us to study the nature of populations of stars and their systematic motions as a function of Galactic latitude. One of our primary goals is to use blue horizontal-branch stars to trace potential star streams in the halo, and to test the hierarchical model for the formation of the Galaxy. In this paper we discuss spectroscopy and multipassband photometry for a sample of 764 blue stars in the Century Survey region. Our sample consists predominantly of A- and F-type stars. We describe our techniques for determination of radial velocities, effective temperatures, metallicities, and surface gravities. Based on these measurements, we derive distance estimates by comparison with a set of calibrated isochrones. We devote special attention to the classification of blue horizontal-branch stars, and compare the results obtained from the application of the techniques of Kinman et al. 1994, Cat. J/AJ/108/1722, Wilhelm et al. (1999, Cat. J/AJ/117/2308), and Clewley et al. (2002MNRAS.337...87C). We identify 55 blue horizontal-branch stars. Our large sample of stars also uncovers a number of unusual objects, including three carbon-enhanced stars, a late B-type star located 0.8kpc above the Galactic plane, and a DZ white dwarf. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 34 33 Comparison with Kinman et al. (1994, Cat. J/AJ/108/1722) table4.dat 96 130 The Blue Horizontal Branch (BHB) Selection table5.dat 105 33 The BHB standards table6.dat 93 34 Unusual objects table7.dat 105 737 Photometry table8.dat 57 737 Spectroscopic Measurements table9.dat 60 737 Stellar Parameters
See also: J/AJ/130/1097 : Century Survey Galactic Halo Project. II. (Brown+, 2005) J/AJ/108/1722 : Blue horizontal branch stars (Kinman+ 1994) J/AJ/117/2308 : Spectroscopy of hot stars in the halo (Wilhelm+, 1999) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Stellar identification (G1) 14- 17 F4.2 mag BJA0 This work's BJA_0_ spectrophotometric index (1) 19- 22 F4.1 0.1nm L0 ? This work's lambda_0_ parameter (2) 25- 28 F4.2 mag K-BJA0 Kinman et al. (1994, <J/AJ/108/1722>) BJA0 spectrophotometric index (1) 30- 33 F4.1 0.1nm K-L0 Kinman et al. (1994, <J/AJ/108/1722>) λ0 parameter (2)
Note (1): Quantifies the size of the Balmer jump (Kinman et al., 1994, Cat. J/AJ/108/1722). Note (2): Measures the slope of the Balmer jump (Kinman et al., 1994, Cat. J/AJ/108/1722). In units of Angstroems.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CHSS] 6- 8 I3 --- CHSS CHSS number (G2) 12- 15 F4.1 --- SpType Spectral type from this work 17- 19 F3.1 --- e_SpType Error in SpType 21- 24 F4.2 mag BJA0 The BJA0 spectrophotometric index 26- 29 F4.2 mag e_BJA0 Error in BJA0 31 I1 --- BHB1 Classified as BHB by the modified Kinman et al. (1994, Cat. J/AJ/108/1722) method (2) 33- 36 I4 K Teff Effective temperature 38- 41 I4 K e_Teff Error in Teff 43- 45 F3.1 [cm/s2] log(g) Log of the surface gravity 47- 49 F3.1 [cm/s2] e_log(g) Error in log(g) 51 I1 --- BHB2 Classified as BHB by the Wilhelm et al. (1999, Cat. J/AJ/117/2308) method (2) 53- 57 F5.2 mag B-V The (B-V)0 color 59- 62 F4.2 mag e_B-V Error in B-V 64- 67 F4.1 0.1nm D0.15 D0.15 value from the Sersic profile fit 69- 71 F3.1 0.1nm e_D0.15 Error in D0.15 73 I1 --- BHB3 Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) D0.15-color method (2) 75- 78 F4.2 --- c The power of the Sersic profile fit 80- 83 F4.2 --- e_c Error in c 85- 88 F4.1 0.1nm b Scale length of the Sersic profile fit in Angstroms 90- 92 F3.1 0.1nm e_b Error in b 94 I1 --- BHB4 Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) Scale width - Shape method (2) 96 I1 --- Tot Sum of the four BHB classification methods (3)
Note (2): Classified as BHB: 1 = yes; 0 = no. Note (3): We consider the stars selected by three or more of the four methods as BHB stars.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Stellar identification (G1) (1) 12- 15 F4.1 --- SpType Spectral type from this work 17- 19 F3.1 --- e_SpType Error in SpType 21- 24 F4.2 mag BJA0 The BJA0 spectrophotometric index 26- 29 F4.2 mag e_BJA0 Error in BJA0 31 I1 --- BHB1 Classified as BHB by the modified Kinman et al. (1994, Cat. J/AJ/108/1722) method (2) 33- 36 I4 K Teff Effective temperature 38- 41 I4 K e_Teff Error in Teff 43- 45 F3.1 [cm/s2] log(g) Log of the surface gravity 47- 49 F3.1 [cm/s2] e_log(g) Error in log(g) 51 I1 --- BHB2 Classified as BHB by the Wilhelm et al. (1999, Cat. J/AJ/117/2308) method (2) 53- 57 F5.2 mag B-V The (B-V)0 color 59- 62 F4.2 mag e_B-V Error in B-V 64- 67 F4.1 0.1nm D0.15 D0.15 value from the Sersic profile fit 69- 71 F3.1 0.1nm e_D0.15 Error in D0.15 73 I1 --- BHB3 Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) D0.15-color method (2) 75- 78 F4.2 --- c The power of the Sersic profile fit 80- 83 F4.2 --- e_c Error in c 85- 88 F4.1 0.1nm b Scale length of the Sersic profile fit in Angstroms 90- 92 F3.1 0.1nm e_b Error in b 94 I1 --- BHB4 Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) Scale width - Shape method (2) 96 I1 --- Tot Sum of the four BHB classification methods (3) 98-105 A8 --- Class Classification
Note (1): Name as in table3.dat Note (2): Classified as BHB: 1 = yes; 0 = no. Note (3): We consider the stars selected by three or more of the four methods as BHB stars.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CHSS] 6- 8 I3 --- CHSS CHSS number (G2) 10- 16 A7 --- Class Classificiation 18- 19 I2 h RAh Right ascension (J2000.0) 21- 22 I2 min RAm Right ascension (J2000.0) 24- 27 F4.1 s RAs Right ascension (J2000.0) 29 A1 --- DE- Declination sign (J2000.0) 30- 31 I2 deg DEd Declination (J2000.0) 33- 34 I2 arcmin DEm Declination (J2000.0) 36- 37 I2 arcsec DEs Declination (J2000.0) 39- 43 F5.2 mag Vmag ? V magnitude 45- 49 F5.3 mag e_Vmag ? rms uncertainty on Vmag 51- 55 F5.2 mag V-R ? V-R colour index 57- 60 F4.2 mag e_V-R ? rms uncertainty on V-R 62- 66 F5.2 mag Jmag ? J magnitude 68- 71 F4.2 mag e_Jmag ? rms uncertainty on Jmag 73- 77 F5.2 mag J-H ? J-H colour index 79- 82 F4.2 mag e_J-H ? rms uncertainty on J-H 84- 88 F5.2 mag H-K ? H-K colour index 90- 93 F4.2 mag e_H-K ? rms uncertainty on H-K
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CHSS] 6- 8 I3 --- CHSS CHSS number (G2) 11- 12 I2 h RAh Hour of Right Ascension (J2000) 14- 15 I2 min RAm Minute of Right Ascension (J2000) 17- 20 F4.1 s RAs Second of Right Ascension (J2000) 21 A1 --- DE- Sign of Declination (J2000) 22- 23 I2 deg DEd Degree of Declination (J2000) 25- 26 I2 arcmin DEm Arcminute of Declination (J2000) 28- 29 I2 arcsec DEs Arcsecond of Declination (J2000) 32- 36 F5.2 mag Vmag ? The V band magnitude 38- 42 F5.3 mag e_Vmag ? The error in Vmag 45- 49 F5.2 mag V-R ? The (V-R) color 51- 54 F4.2 mag e_V-R ? The error in V-R 57- 61 F5.2 mag B-V The (B-V)_0_ color (2) 64- 67 F4.2 mag E(B-V) The E(B-V) reddening value (3) 70- 74 F5.2 mag Jmag ? The J band magnitude (4) 76- 79 F4.2 mag e_Jmag ? The error in Jmag (4) 82- 86 F5.2 mag J-H ? The (J-H) band color (4) 88- 91 F4.2 mag e_J-H ? The error in J-H (4) 94- 98 F5.2 mag H-K ? The (H-K) band color (4) 100-103 F4.2 mag e_H-K ? The error in H-K (4)
Note (2): Predicted from Balmer line strengths. Note (3): From Schlegel et al. (1998ApJ...500..525S), reduced according to our distance estimate. Note (4): From the 2MASS Second Data Release, B/2mass, See Cat. II/241.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CHSS] 6- 8 I3 --- CHSS CHSS number (G2) 11- 15 F5.2 --- KP KP (Ca II) index (pseudo-equivalent width) 18- 22 F5.2 --- HP2 HP2 (Hδ) index (pseudo-equivalent width) 25- 29 F5.2 --- HG2 ? HG2 (Hγ) index (pseudo-equivalent width) 32- 35 F4.2 --- GP ? The GP (G-band) index (pseudo-equivalent width) 38- 41 F4.1 --- SpType Estimated spectral Type (coded B0=10, A0=20, ...) 43- 45 F3.1 --- e_SpType Error in SpType 47- 52 F6.1 km/s RV Radial velocity 54- 57 F4.1 km/s e_RV The error in RV
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CHSS] 6- 8 I3 --- CHSS CHSS number (G2) 10 A1 --- f_CHSS [b] Flag on CHSS (2) 12- 15 I4 K Teff Effective temperature 18- 21 F4.2 [cm/s2] log(g) Log of the surface gravity 24- 28 F5.2 [Sun] [Fe/H]GA ? [Fe/H] metallicity from the genetic algorithm (3) 30- 34 F5.2 [Sun] [Fe/H]KP ? [Fe/H] metallicity from the KP index (3) 36- 40 F5.2 [Sun] [Fe/H]EC ? [Fe/H] metallicity from the equivalent widths/chi-square spectral match procedure (3) 42- 46 F5.2 [Sun] [Fe/H] ? Final average log [Fe/H] metallicity (3) 47 A1 --- u_[Fe/H] Uncertainty flag on [Fe/H] 49- 53 F5.2 kpc Dist ? Estimated distance 55- 59 F5.2 mag VMAA ? Absolute V band magnitude (4)
Note (2): Note on CHSS: b = observed in non-photometric conditions and thus have increased uncertainty in the Dis column. Note (3): Ratio relative to the Sun. Note (4): Corrected for reddening and given the estimated distance. Where there is no V photometry, the 2MASS J magnitude and the mean (V-J) color are used for the measured spectral type to estimated VMag.
Global notes: Note (G1): In Simbad, RR7 NNN = [KSK94] RR 7 NNN SA57 NNN = [KSK94] SA 57 NNN Note (G2): The designation CHSS stands for Century Halo Star Survey and is chosen to be unique from previous surveys.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Oct-2003
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

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