2007AJ....134.1777T


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:09:36

2007AJ....134.1777T - Astron. J., 134, 1777-1789 (2007/November-0)

The uvbyHβ metallicity calibration for G and K dwarfs.

TWAROG B.A., VARGAS L.C. and ANTHONY-TWAROG B.J.

Abstract (from CDS):

The metallicity dependence of the primary indices of the uvby photometric system for cooler dwarfs (Te∼6500-5000 K) is investigated. The database for the analysis is composed of the overlap between a composite catalog of selected, high-dispersion spectroscopic abundances for 1801 stars on the metallicity scale of Valenti & Fischer and a merged catalog of high-precision uvbyHβ photometry for over 35,000 stars. While [Fe/H] for F dwarfs is best estimated from m1, with a modest dependence on c1 as expected, for hotter G dwarfs the pattern reverses, and c1 becomes the dominant index. For cooler G dwarfs and K stars, the c1 dominance continues, but a discontinuity appears such that stars between b-y=0.50 and 0.58 with [Fe/H]≥+0.25 have m1 and c1indices that classify them as subgiants, confirming an earlier result based on a much smaller sample. The reversal in the sensitivity to m1 and c1is traced, in part, to the metallicity sensitivity of the b-y index. Moreover, b-y grows larger in a nonlinear fashion for stars above solar metallicity, leading to an overestimate of the reddening for super-metal-rich stars from some standard intrinsic color relations. Based on successful tests using indices from synthetic spectra and the empirical trends among the observations, metallicity calibrations tied to Hβ rather than b-y have been derived for [Fe/H]≥-1.0, generating dispersions among the residuals ranging from 0.061 to 0.085 dex over the entire temperature range of interest. The new calibrations have the added advantage of being significantly less sensitive to errors in reddening than previous calibrations.

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Journal keyword(s): Stars: Abundances - Techniques: Photometric

Simbad objects: 28

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Number of rows : 28

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* GX And Er* 00 18 22.8849667932 +44 01 22.637271919   10.120   7.3   M2V 458 0
2 HD 1963 * 00 23 33.2252485656 -54 03 16.673726394   9.509 8.827     K0III 11 1
3 HD 8178 PM* 01 19 58.3028537001 -57 20 56.953653235   7.87 7.43     F3V 22 1
4 HD 8224 ** 01 20 27.94163 -57 20 18.6627           F7V 25 0
5 HD 13246 PM* 02 07 26.1252246821 -59 40 45.943903559   8.02 7.50     F7V 73 1
6 HD 17006 PM* 02 42 08.4438019607 -46 31 27.989431339   6.985 6.094     K1III 44 0
7 HD 25054 PM* 03 55 23.4436304579 -60 54 25.949944817   8.12 7.61     F6/7V 24 1
8 HD 25059 PM* 03 58 56.1792452868 +00 45 04.120506627       8.8   G3V 28 1
9 HD 31265 * 04 56 42.7128722936 +47 20 24.459934296   8.85 8.81     B9 10 1
10 HD 32065 PM* 04 57 07.4742601689 -58 04 10.694138971   7.18 6.82     F2V 24 1
11 V* AF Lep RS* 05 27 04.7631691589 -11 54 03.466187467   6.832 6.295     F8V(n)k: 211 0
12 HD 38114 PM* 05 44 51.0979633427 +32 23 27.085882888   9.12 8.13     G5 14 0
13 HD 45088 BY* 06 26 10.2539732357 +18 45 24.784795160 8.402 7.74   6.2   K2Ve 229 0
14 * ups Car B * 09 47 06.7499670895 -65 04 22.297884869   6.08 5.99     B7III 24 0
15 HD 85424 PM* 09 49 15.1770036842 -63 09 05.911853415   8.63 8.12     F5IV 20 1
16 HD 101085 * 11 37 28.0926612276 -63 40 58.751077281 8.40 8.61 8.36     B8IV 19 1
17 HD 108500 ** 12 28 16.87916 -61 45 56.5515 7.67 7.49 6.82     G3V 46 0
18 HD 110898 PM* 12 45 23.2658558363 +04 21 35.845761579   10.11   9.3   G3V 37 0
19 NGC 6253 OpC 16 59 05 -52 42.0     10.2     ~ 146 0
20 HD 167854 PM* 18 21 10.7103309701 -62 11 34.839974733   8.33 7.89     F5V 20 1
21 NGC 6791 OpC 19 20 53 +37 46.3   10.52 9.5     ~ 886 0
22 HD 182736 Er* 19 24 03.3794425774 +44 56 00.735214599   7.82 7.01     G8IV 62 0
23 HD 182028 * 19 27 25.6737777697 -66 07 19.096700806   8.76 8.68     A1V 6 1
24 * mu. Tel * 19 30 34.6119920104 -55 06 36.194394066   6.714 6.285     F5V 32 1
25 HD 206481 gD* 21 45 44.1117169225 -69 21 49.423715983   8.20 7.86     F2V 19 1
26 HD 218482 PM* 23 08 47.7597942154 -41 49 07.645262214   10.851 10.158 9.85   G6V 9 1
27 HD 221551 * 23 33 26.60014 -57 01 44.6363   9.06 8.60     F6/7V 23 2
28 HD 221552 * 23 33 30.2531734514 -57 03 13.179020635   8.17 7.77     F2/3V 22 1

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:09:36

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