Access to Astronomical Catalogues

← Click to display the menu
J/A+A/493/913       Abundances of 9 HB stars in NGC 6352       (Feltzing+, 2009)

Stellar abundances and ages for metal-rich Milky Way globular clusters. Stellar parameters and elemental abundances for 9 HB stars in NGC 6352. Feltzing S., Primas F., Johnson R.A. <Astron. Astrophys. 493, 913 (2009)> =2009A&A...493..913F
ADC_Keywords: Clusters, globular ; Stars, horizontal branch ; Abundances Keywords: Galaxy: globular clusters: individual: NGC 6352 - stars: horizontal-branch - stars: abundances Abstract: Metal-rich globular clusters provide important tracers of the formation of our Galaxy. Moreover, and not less important, they are very important calibrators for the derivation of properties of extra-galactic metal-rich stellar populations. Nonetheless, only a few of the metal-rich globular clusters in the Milky Way have been studied using high-resolution stellar spectra to derive elemental abundances. Additionally, Rosenberg et al. identified a small group of metal-rich globular clusters that appeared to be about 2 billion years younger than the bulk of the Milky Way globular clusters. However, it is unclear if like is compared with like in this dataset as we do not know the enhancement of alpha-elements in the clusters and the amount of alpha-elements is well known to influence the derivation of ages for globular clusters. We present a study of elemental abundances for alpha and iron-peak elements for nine HB stars in the metal-rich globular cluster NGC 6352. The elemental abundances are based on high-resolution, high signal-to-noise spectra obtained with the UVES spectrograph on VLT. The elemental abundances have been derived using standard LTE calculations and stellar parameters have been derived from the spectra themselves by requiring ionizational as well as excitational equilibrium. We find that NGC 6352 has [Fe/H]=-0.55, is enhanced in the alpha-elements to about +0.2dex for Ca, Si, and Ti relative to Fe. For the iron-peak elements we find solar values. Based on the spectroscopically derived stellar parameters we find that an E(B-V)=0.24 and (m-M). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 61 9 Data for our sample abun.dat 26 143 Elemental abundances for the nine stars in NGC 6352 ew.dat 32 3222 Measured equivalent widths for 13 elements
See also: J/AJ/110/652 : VI photometry in NGC 6352 (Fullton+ 1995) J/A+AS/129/237 : G and K dwarfs abundances (Feltzing+ 1998) J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003) J/A+A/415/155 : Oxygen abundances in the Galactic disk (Bensby+, 2004) J/A+A/433/185 : Detailed abundance analysis of 102 F & G dwarfs (Bensby+ 2005) J/A+A/467/665 : Manganese abundances in the Galactic disk (Feltzing+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- --- [NGC 6352] 10- 11 I2 --- Seq [01/09] Star number, as in Fig. 1 13 A1 --- --- [A] 14- 16 I3 --- ALC ? Alcaino (1971A&A....11....7A) number, Cl* NGC 6352 ALC NNN in Simbad 18 A1 --- --- [H] 19- 21 I3 --- HH ? Hartwick & Hesser (1972ApJ...175...77H) number, NGC 6352 NNN in Simbad 23- 32 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) (1) 34- 43 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1) 45- 49 F5.2 mag Vmag HST V555 magnitude 51- 54 F4.2 mag V-I HST V555-I814 colour index 56- 61 F6.3 mag Kmag 2MASS K magnitude
Note (1): Positions from 2MASS (Skrutskie et al., 2006AJ....131.1163S).
Byte-by-byte Description of file: abun.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq [01/09]? Star number, as in Fi.g 1 3- 6 A4 --- n_Seq [Mean Med] Mean or Median abundance for all stars 8- 11 A4 --- El Element and ionizational stage (I for neutral, II for singly ionized) 13- 17 F5.2 [Sun] Abund Abundance of the element 19- 22 F4.2 [Sun] sigma ? The associate line-to-line scatter (1) 24- 26 I3 --- NLine ? Number of lines used in the determination of the abundance
Note (1): Note that this is the line-to-line scatter. The error in the mean for the abundance is hence sigma/sqrt(NLine).
Byte-by-byte Description of file: ew.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq [01/09] Star number, as in Fig. 1 4- 7 A4 --- El Element and ionizational stage (I for neutral, II for singly ionized) 9- 15 F7.2 0.1nm Lambda Wavelength for the line, in Angstrom 17- 20 F4.2 eV Chi Excitation energy of the lower level 22- 26 F5.2 --- log(gf) Oscillator strengths used in the abundance analysis 28- 32 F5.1 0.1pm EW Equivalenth widths
Acknowledgements: Sofia Feltzing, sofia(at)astro.lu.se
(End) Sofia Feltzing [Lund Obs., Sweden], Patricia Vannier [CDS] 23-Oct-2008
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

catalogue service

© UDS/CNRS

Contact