2011ApJ...742L..28C


Query : 2011ApJ...742L..28C

2011ApJ...742L..28C - Astrophys. J., 742, L28 (2011/December-1)

On a new theoretical calibration of the Stromgren hk metallicity index: NGC 6522 as a first test case.

CALAMIDA A., BONO G., CORSI C.E., IANNICOLA G., RIPEPI V., ANTHONY-TWAROG B., TWAROG B., ZOCCALI M., BUONANNO R., CASSISI S., FERRARO I., GRUNDAHL F., PIETRINFERNI A. and PULONE L.

Abstract (from CDS):

We present a new theoretical calibration of the Strömgren metallicity index hk using α-enhanced evolutionary models transformed into the observational plane by using atmosphere models with the same chemical mixture. We apply the new metallicity-index-color (MIC) relations to a sample of 85 field red giants (RGs) and find that the difference between photometric estimates and spectroscopic measurements is on average smaller than 0.1 dex with a dispersion of σ= 0.19 dex. The outcome is the same if we apply the MIC relations to a sample of eight RGs in the bulge globular cluster NGC 6522, but the standard deviation ranges from 0.26 (hk, v - -y) to 0.49 (hk, u - -y). The difference is mainly caused by a difference in photometric accuracy. The new MIC relations based on the Ca - -y color provide metallicities systematically more metal-rich than the spectroscopic ones. We found that the Ca band is affected by Ca abundance and possibly by chromospheric activity.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: evolution

Simbad objects: 15

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Number of rows : 15
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 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 956 0
2 HD 7595 SB* 01 15 29.5309284011 -28 15 53.574087229   10.99 9.73     K0/1III 33 0
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1290 0
4 HD 35179 * 05 22 21.0081621823 -14 23 50.065028141   10.46 9.48     G8IV 34 0
5 HD 44007 Pe* 06 18 48.5271098810 -14 50 43.424752212   8.85 8.06 7.69   G5(IV)wF3/5 174 0
6 HD 55496 Pe* 07 12 11.3777515932 -22 59 00.610613637   9.30 8.40     G(II)wp(Ba) 67 1
7 HD 84903 Pe* 09 47 19.2014975287 -41 27 04.199082703   9.10 8.04     GwA/F(V) 76 0
8 BD+04 2466 PM* 11 26 49.1890409114 +03 51 51.646284678   11.22 10.67 10.45   KIIvw 70 0
9 BD-01 2582 Pe* 11 53 37.3233658419 -02 00 36.726031369   10.29 9.60     CEMP-s 98 0
10 HD 135148 SB* 15 13 17.4566658985 +12 27 25.536244668   10.87 9.39 8.97   CEMP-s 89 0
11 NAME Baade Window reg 18 03.5 -30 01           ~ 561 3
12 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 479 1
13 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1262 0
14 CD-62 1346 Pe* 21 06 02.9221670307 -61 33 44.645933103   10.55 9.85 9.56 9.027 CEMP-s 53 0
15 NAME Galactic Bar reg ~ ~           ~ 988 0

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2021.08.04-15:21:45

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