Fluorine Abundances in the Globular Cluster M4

Guerco, RafaelObserv Nacl, Rio De Janeiro, Brazil.,National Observatory Brazil (författare)

We present chemical abundances for the elements carbon, sodium, and fluorine in 15 red giants of the globular cluster M4, as well as six red giants of the globular cluster w Centauri. The chemical abundances were calculated in LTE via spectral synthesis. The spectra analyzed are high-resolution spectra obtained in the near-infrared region around 2.3 mu m with the Phoenix spectrograph on the 8.1 m Gemini South Telescope, the IGRINS spectrograph on the McDonald Observatory 2.7 m Telescope, and the CRIRES spectrograph on the ESO 8.2 m Very Large Telescope. The results indicate a significant reduction in the fluorine abundances when compared to previous values from the literature for M4 and w Centauri, due to a downward revision in the excitation potentials of the HF (1-0) R9 line used in the analysis. The fluorine abundances obtained for the M4 red giants are found to be anticorrelated with those of Na, following the typical pattern of abundance variations seen in globular clusters between distinct stellar populations. In M4, as the Na abundance increases by similar to+0.4 dex, the F abundance decreases by similar to-0.2 dex. A comparison with abundance predictions from two sets of stellar evolution models finds that the models predict somewhat less F depletion (similar to-0.1 dex) for the same increase of +0.4 dex in Na.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
globular clusters: individual (M4
w Centauri)
infrared: stars
stars: abundances
stars: atmospheres
techniques: spectroscopic
globular clusters: individual (M4, ω Centauri)
infrared: stars
stars: abundances
stars: atmospheres
techniques: spectroscopic

Cunha, KatiaObserv Nacl, Rio De Janeiro, Brazil.;Univ Arizona, Tucson, AZ 85719 USA.,National Observatory Brazil,University of Arizona (författare)
Smith, Verne V.Natl Opt Astron Observ, Tucson, AZ 85719 USA.,National Optical Astronomy Observatory (författare)
Pereira, Claudio B.Observ Nacl, Rio De Janeiro, Brazil.,National Observatory Brazil (författare)
Abia, CarlosUniv Granada, Dept Fis Teor & Cosmos, E-18071 Granada, Spain.,University of Granada (författare)
Lambert, David L.Univ Texas Austin, WJ McDonald Observ, Austin, TX 78712 USA.;Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.,University of Texas at Austin (författare)
de Laverny, PatrickUniv Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Nice, France.,Côte d'Azur Observatory (författare)
Recio-Blanco, AlejandraUniv Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Nice, France.,Côte d'Azur Observatory (författare)
Jönsson, HenrikLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)astr-hkj (författare)
Observ Nacl, Rio De Janeiro, Brazil.National Observatory Brazil (creator_code:org_t)

Av författaren/redakt...: Guerco, Rafael; Cunha, Katia; Smith, Verne V.; Pereira, Claudio ...; Abia, Carlos; Lambert, David L ...; visa fler...; de Laverny, Patr ...; Recio-Blanco, Al ...; Jönsson, Henrik; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.