2013A&A...560A..74D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST23:23:18

2013A&A...560A..74D - Astronomy and Astrophysics, volume 560A, 74-74 (2013/12-1)

Revisited fluorine abundances in the globular cluster M 22.

DE LAVERNY P. and RECIO-BLANCO A.

Abstract (from CDS):

Fluorine is a fairly good tracer of formation histories of multiple stellar populations in globular clusters as already revealed by several studies. Large variations in fluorine abundance in red giant stars of the globular cluster M 22 have been recently reported by two different groups. Futhermore, one of these studies claims that the abundance of fluorine is anti-correlated with sodium abundances in this cluster, leading to strong conclusions on the chemical history of M 22. To validate this important finding, we re-examine the F abundance determinations of some of the previously studied stars. We have reanalysed some high-resolution VLT/CRIRES spectra of RGB stars found in M 22 in order to re-estimate their fluorine abundance from the spectral synthesis of the HF line at 2.336µm. Unlike what has been previously estimated, we show that only upper limits or doubtful fluorine abundances with large uncertainties in M 22 RGB stars can be derived. This is caused by an incorrect identification of continuum fluctuations as the HF signature combined with a wrong correction of the stellar radial velocity. Such continuum fluctuations could be the consequences of telluric residuals that are still present in the analysed spectra. Therefore, no definitive conclusions on the chemical pollution caused by the M 22 first stellar generation can presently be drawn from the fluorine content of this cluster.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M 22 - stars: abundances

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1751 1
2 Cl* NGC 6656 SAN 1 * 18 35 37.7194197632 -23 46 43.345277364   14.5 13.687     ~ 3 0
3 NGC 6656 3052 * 18 36 10.1882767604 -23 54 22.152554850   13.2488 11.5217   9.6761 ~ 33 0
4 NGC 6656 3015 * 18 36 15.6177474637 -23 55 01.582871876   13.057 11.362   9.484 ~ 12 0
5 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1175 0
6 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 882 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-23:23:18

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