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J/AJ/107/1577                  Halo red giants reddening (Anthony-Twarog+, 1994)

Reddening estimation for halo red giants using uvby photometry Anthony-Twarog B.J., Twarog B.A. <Astron. J. 107, 1577 (1994)> =1994AJ....107.1577A
ADC_Keywords: Photometry, uvby ; Stars, metal-deficient Abstract: Updated uvby observations for a larger sample of metal-deficient red giants are presented and combined with a select sample of data from the literature transformed to a common system. Using the reddening maps of Burstein & Heiles [AJ, 87, 1165 (1982)], new absolute magnitudes, distances, metallicities, and reddenings are derived for each star. The metallicities are determined with a revised calibration of the m1, (b-y) diagram based upon comparison to a compilation of recent spectroscopic abundances transformed to a common system. The photometric abundances agree very well with the spectroscopic; the dispersion among the residuals for 58 giants is ±0.16dex. The dereddened indices are used to show that for red giants with [Fe/H]←1.5, there is a well-defined relation in the c0, (b-y)0 diagram which exhibits only a weak dependence upon metallicity. Use of the standard relations allows one to obtain reddening estimates for normal halo field giants and globular clusters in the appropriate metallicity range. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 68 114 uvby photometry of metal-deficient giants table5a.dat 53 114 Derived parameters from table1
See also: J/AJ/109/2828 : CaII H and K filter photometry II. (Twarog+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Identification (1) 11- 16 F6.3 mag Vmag [6.7/14.2] Visual magnitude 18- 22 F5.3 mag e_Vmag Standard deviation in V (2) 24- 28 F5.3 mag b-y b-y color index on the Stromgren system 30- 34 F5.3 mag e_b-y Standard deviation in b-y (2) 36- 37 I2 --- o_b-y Number of observations for V and b-y (3) 39- 43 F5.3 mag m1 m1 index 45- 49 F5.3 mag e_m1 Standard deviation in m1 (2) 51- 55 F5.3 mag c1 c1 index 57- 61 F5.3 mag e_c1 Standard deviation in c1 (2) 63- 64 I2 --- o_c1 Number of observations for m1 and c1 (3) 66 I1 --- n_ID [1/2]? Note flag (1)
Note (1): Henry Draper, Durchmusterung, or other identification if n_ID is: 1 = Identification from Beers et al. 1992, Cat. J/AJ/103/198 2 = Identification from Beers et al. 1992, Cat. J/AJ/103/1987 is a brighter giant located near a potential metal-deficient program star; its approximate position is 23:24:00-02:55:58 (B1950). The actual program star proved to be too faint to produce reliable photometry. [Note added at CDS in July 2016: this star is 2MASS J23263267-0239363] Note (2): Errors listed for the magnitude and the indices are standard deviations for a single observation; the standard deviations have been set to 0.000 for stars with only one observation (in field o_b-y or o_c1). It should be emphasized that the probable photometric errors for the stars with V>13.0 and only one observation are significantly larger than implied by the brighter stars. Note (3): Because the stars were also included in the Caby photometric program (Anthony-Twarog et al. 1991, AJ, 101, 1902), many of the stars have a larger number of V and (b-y) (field N1) than m1 and c1 (field N2).
Byte-by-byte Description of file: table5a.dat
Bytes Format Units Label Explanations
1- 9 A9 --- ID Identification 11 A1 --- n_E(b-y) [ *] Note for derived reddening (4) 13- 17 F5.3 mag E(b-y) ? Reddening 20- 24 F5.2 mag Mv ? Absolute magnitude 26- 30 I5 pc R ? Distance 32 A1 --- l_[Fe/H] Limit flag for [Fe/H] 33- 37 F5.2 [Sun] [Fe/H] Metallicity 40- 44 F5.2 [Sun] [Fe/H]s ? Average spectroscopic abundance 48- 51 F4.2 [Sun] e_[Fe/H]s ? Dispersion in [Fe/H]s 53 I1 --- N ? Number of estimates included in [Fe/H]s
Note (4): An asterisk, '*', indicates that the derived reddening, E(b-y) is from comparisons to the standard c0,(b-y)0 relations, as described in Section 4.3 of the printed paper.
Addresses: Anthony-Twarog B.J. and Twarog B.A. anthony at Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045-2151 Origin: AAS CD-ROM series, Volume 2, 1994
(End) Lee Brotzman [ADS] 08-May-1994, Patricia Bauer [CDS] 24-Oct-1994
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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