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J/A+A/422/527       Metal-poor star uvby-beta photometry. X.   (Schuster+, 2004)

uvby-beta photometry of high-velocity and metal-poor stars. X. Stars of very low metal abundance: observations, reddenings, metallicities, classifications, distances, and relative ages. Schuster W.J., Beers T.C., Michel R., Nissen P.E., Garcia G. <Astron. Astrophys. 422, 527 (2004)> =2004A&A...422..527S
ADC_Keywords: Stars, high-velocity ; Stars, metal-deficient ; Photometry, uvby, beta ; Abundances, [Fe/H] Keywords: stars: abundances - stars: distances - stars: fundamental parameters - ISM: dust, extinction - Galaxy: evolution - Galaxy: halo Abstract: (uvby) and H-beta photometry has been obtained for an additional 411 very metal-poor stars selected from the HK survey, and used to derive basic parameters such as interstellar reddenings, metallicities, photometric classifications, distances, and relative ages. Description: Table 1 lists the Stroemgren (uvby) and H-beta photometry observed at the San Pedro Martir observatory, Mexico, plus the number of independent uvby and H-beta observations and Notes concerning the observing conditions, stellar types, and photometric variability. Table 2 contains the Stroemgren (uvby) photometry observed at the La Silla, Chile, observatory, plus the number of independent uvby observations and Notes concerning possible photometric variability. Table 3 gives a list of the 497 very metal poor stars with their positions, both equatorial and Galactic; broadband V and B-V photometry, where available; the reddenings in the stellar directions obtained by interpolation in the maps of Schlegel, Finkbeiner, & Davis (1998ApJ...500..525S); our final adopted reddening according to Eq. 1; the resulting dereddened B-V; also B-V dereddened according to the intrinsic-color calibration of Schuster & Nissen (1989, Cat. II/180); and finally asterisks in the final two columns which indicate the stars that are CH-star candidates according to Fig. 5, and those that are photometric outliers as seen in Figs. 1 and 4, respectively. Table 4 contains the cross-identifications for a number of the very metal poor stars; these are stars identified as very-metal-poor in more than one of the overlapping fields from the HK survey. Table 5 gives the dereddened values V0, (b-y)0, m0, and c0 for our uvby photometry, the reddening excesses for (b-y) and (B-V), and the photometric classification according to our c0,(b-y)0 diagram, Fig. 6. Table 6 shows the line-strength indices from the HK survey. KP is the index that measures the strength of the CaII K line; HP2 and HG2 measure the strengths of the Balmer lines H-delta and H-gamma, respectively; GP measures the strength of the CH G-band. Table 7 lists the [Fe/H] values from our different calibration procedures with the adopted mean in column 6 and Notes in column 7. Table 8 contains observed and derived quantities for the probable metal-rich BS (Am) stars. Table 9 gives the photometric absolute magnitudes and stellar distances for the 497 very-metal-poor stars; stellar distances are given from both the BV and uvby photometries. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 78 245 uvby-β data from SPM table2.dat 78 177 uvby data from La Silla table3.dat 83 497 Coordinates, BV photometry, reddening excesses, (B-V)0's, and Notes table4.dat 31 53 Cross-Identifications of VMP Stars table5.dat 61 507 Dereddened photometry, Reddening Excesses, and Photometric Classifications table6.dat 31 497 Line-strength indices from the HK survey table7.dat 41 497 [Fe/H] values from different methods, plus adopted average table8a.dat 68 10 Metal-rich BS (Am) stars - observed quantities table8b.dat 59 10 Metal-rich BS (Am) stars - derived quantities table9.dat 69 497 Photometric absolute magnitudes and distances of the VMP stars
See also: II/180 : Metal-poor stars uvby-beta photometry. III. (Schuster+ 1989) J/A+AS/97/951 : Metal-poor stars uvby-beta photometry. VI. (Schuster+ 1993) J/A+AS/117/317 : Metal-poor stars uvby-beta photometry. VIII. (Schuster+ 1996) J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star designation 11- 16 F6.3 mag Vmag ? Johnson V magnitude 18- 23 F6.3 mag b-y Stroemgren colour index b-y 25- 30 F6.3 mag m1 Stroemgren metallicity index m1 32- 37 F6.3 mag c1 Stroemgren Balmer discontinuity index c1 39 I1 --- o_b-y Number of independent observations in uvby 41- 45 F5.3 mag Hbeta ? Hβ line index 47 I1 --- o_Hbeta ? Number of independent observations in Hbeta 49- 78 A30 --- Notes Notes (1)
Note (1): Notes: V,V? = variable(?) RG = red subgiant-giant fnt(r) = faint(er) st = star os = outside dph = diaphragm D,D? = double(?) wo = without excl = exclude obs = observation(s) contm = contaminated ocntr = offcenter js = just S = south
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 12 I2 h RAh Right ascension (J2000.0) 14- 15 I2 min RAm Right ascension (J2000.0) 17- 20 F4.1 s RAs Right ascension (J2000.0) 22 A1 --- DE- Declination sign (J2000.0) 23- 24 I2 deg DEd Declination (J2000.0) 26- 27 I2 arcmin DEm Declination (J2000.0) 29- 30 I2 arcsec DEs Declination (J2000.0) 32- 36 F5.1 deg GLON Galactic longitude 38- 42 F5.1 deg GLAT Galactic latitude 44- 48 F5.2 mag Vmag ? V magnitude 50- 54 F5.2 mag B-V ? B-V colour index 56- 60 F5.2 mag E(B-V)S Interstellar reddening from Schlegel et al., 1998ApJ...500..525S 62- 66 F5.2 mag E(B-V) Adopted interstellar reddening in (B-V) from Eq. 1 68- 72 F5.2 mag (B-V)0 ? De-reddened Johnson color index B-V 74- 78 F5.2 mag (B-V)0b ? Estimated de-reddened Johnson color index B-V, derived from (b-y)_0, Fig. 4 80 A1 --- CH [*] *: star is likely carbon enhanced, from Fig. 5 83 A1 --- OUT [*] *: star is considered a photometric outlier, from Figs. 1, 4
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 12- 20 A9 --- Name2 Second alternative name of star 23- 31 A9 --- Name3 Third alternative name of star
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 16 F6.3 mag V0 ? Visual magnitude corrected for interstellar absorption (1) 18- 23 F6.3 mag (b-y)0 De-reddened Stroemgren color index b-y (1) 25- 30 F6.3 mag m0 De-reddened Stroemgren metallicity index m1 (1) 32- 37 F6.3 mag c0 De-reddened Stroemgren Balmer discontinuity index c1 (1) 39- 44 F6.3 mag E(b-y) ? Stroemgren interstellar reddening estimate from intrinsic-color calibration of Schuster & Nissen (1989, Cat. II/180) 46- 49 F4.2 mag E(B-V) ? Adopted interstellar reddening in (B-V), from eq. 1 51- 61 A11 --- Class Photometric classification of star, Fig.6 (G1)
Note (1): V, b-y, m1 and c1 have been corrected for the effect of interstellar reddening if E(b-y)≥0.015 or E(B-V)≥0.02.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 14 F4.2 0.1nm KP ? Ca II K line index 16- 20 F5.2 0.1nm HP2 ? Balmer Hδ line index 22- 26 F5.2 0.1nm HG2 ? Balmer Hγ line index 28- 31 F4.2 0.1nm GP ? CH G-band line index
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 15 F5.2 [Sun] [Fe/H]K1 ? Metallicity based on KP, (B-V)0b (Beers et al., 1999, Cat. J/AJ/117/981) 17- 21 F5.2 [Sun] [Fe/H]A1 ? Metallicity based on KP, (B-V)0b, and an Artificial Neural Network 23- 27 F5.2 [Sun] [Fe/H]K2 ? Metallicity based on KP, (B-V)0 (Beers et al., 1999, Cat. J/AJ/117/981) 29- 33 F5.2 [Sun] [Fe/H]A2 ? Metallicity based on KP, (B-V)0, and an Artificial Neural Network 35- 39 F5.2 [Sun] [Fe/H] ? Final estimate of metallicity 41 I1 --- Notes [1/3]? Individual notes (1)
Note (1): Individual notes: 1: Late-type star, CaII-K emission 2: Composite spectrum (Early + Late) 3: CD-38:245
Byte-by-byte Description of file: table8a.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 16 F6.3 mag VJmag Johnson V magnitude 18- 22 F5.3 mag b-y Stroemgren colour index b-y 24- 28 F5.3 mag m1 Stroemgren metallicity index m1 30- 34 F5.3 mag c1 Stroemgren Balmer discontinuity index c1 36- 40 F5.3 mag Hbeta Hβ line index 42- 46 F5.3 mag [c1] Reddening-free Balmer discontinuity index 48- 52 F5.3 mag [m1] Reddening-free metallicity index 54- 58 F5.2 mag Vmag ? Johnson broad-band V magnitude 60- 63 F4.2 mag B-V ? Johnson broad-band B-V colour index 65- 68 F4.2 mag U-B ? Johnson broad-band U-B colour index
Byte-by-byte Description of file: table8b.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 14 F4.2 mag E(B-V) Adopted interstellar reddening in (B-V) from Eq. 1 16- 19 F4.2 mag (B-V)0 De-reddened Johnson color index B-V 20 A1 --- u_(B-V)0 [)] Uncertainty flag on (B-V)0 22- 25 F4.2 mag (U-B)0 ? De-reddened Johnson color index U-B 27- 32 F6.3 mag V0 V magnitude corrected for interstellar absorption 34- 38 F5.3 mag (b-y)0 De-reddened Stroemgren color index b-y 40- 44 F5.3 mag m0 De-reddened Stroemgren metallicity index m1 46- 50 F5.3 mag c0 De-reddened Stroemgren Balmer discontinuity index c1 52- 53 A2 --- Class Photometric classification of star (G1) 55- 59 F5.2 [Sun] [Fe/H] ? Final estimate of metallicity
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name 11- 21 A11 --- Class Photometric classification of star (G1) 24- 29 F6.3 mag VMAG1 ? Estimated absolute magnitude, assuming primary classification (MS for TO stars, as listed for others) and UBV photometry 31- 36 F6.3 mag VMAG2 ? Estimated absolute magnitude, assuming secondary classification (SG or RG for TO stars) and UBV photometry 38- 42 I5 pc Dist1 ? Estimated distance, assuming primary classification (MS for TO stars, as listed for others) and UBV photometry 44- 48 I5 pc Dist2 ? Estimated distance, assuming secondary classification (SG or RG for TO stars) and UBV photometry 50- 54 I5 pc Dist ? Estimated distance based on Stroemgren photometry and indices 56- 69 A14 --- Notes Comments on individual stars
Global Notes: Note (G1): the photometric classes are as in Fig.6 of the paper: TO = turnoff stars; BS-TO = the blue-straggler-turnoff transition; BS = blue stragglers; MS = main sequence; SG = subgiant stars; RG = red giants (RG); RHB-AGB = red-horizontal-branch asymptotic-giant-branch transition; HB = horizontal branch; BHB = blue horizontal branch; SL-BHB = subluminous blue-horizontal-branch transition; SL = subluminous (SL) stars.
Acknowledgements: William Schuster References: Schuster at al., Paper I 1988A&AS...73..225S Schuster at al., Paper II 1989A&A...221...65S Schuster at al., Paper III 1989A&A...222...69S, Cat. II/180 Allen et al., Paper IV 1991A&A...244..280A Nissen et al., Paper V 1991A&A...251..457N Schuster et al. Paper VI 1993A&AS...97..951S, Cat. J/A+AS/97/951 Marquez et al., Paper VII 1994A&AS..108..341M Schuster et al., Paper VIII 1996A&AS..117..317S, Cat. J/A+AS/117/317 Schuster at al., Paper IX 1997A&A...319..796S Schuster at al., Paper XI 2006A&A...445..939S, Cat. J/A+A/445/939
(End) William Schuster [UNAM], Patricia Bauer [CDS] 29-Mar-2004
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