SIMBAD references

2016A&A...588A.148H - Astronomy and Astrophysics, volume 588A, 148-148 (2016/4-1)

MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397.

HUSSER T.-O., KAMANN S., DREIZLER S., WENDT M., WULFF N., BACON R., WISOTZKI L., BRINCHMANN J., WEILBACHER P.M., ROTH M.M. and MONREAL-IBERO A.

Abstract (from CDS):

Aims. We demonstrate the high multiplex advantage of crowded field 3D spectroscopy with the new integral field spectrograph MUSE by means of a spectroscopic analysis of more than 12000 individual stars in the globular cluster NGC 6397.
Methods. The stars are deblended with a point spread function fitting technique, using a photometric reference catalogue from HST as prior, including relative positions and brightnesses. This catalogue is also used for a first analysis of the extracted spectra, followed by an automatic in-depth analysis via a full-spectrum fitting method based on a large grid of PHOENIX spectra.
Results. We analysed the largest sample so far available for a single globular cluster of 18 932 spectra from 12 307 stars in NGC 6397. We derived a mean radial velocity of vrad=17.84±0.07km/s and a mean metallicity of [Fe/H]=-2.120±0.002, with the latter seemingly varying with temperature for stars on the red giant branch (RGB). We determine Teff and [Fe/H] from the spectra, and log g from HST photometry. This is the first very comprehensive Hertzsprung-Russell diagram (HRD) for a globular cluster based on the analysis of several thousands of stellar spectra, ranging from the main sequence to the tip of the RGB. Furthermore, two interesting objects were identified; one is a post-AGB star and the other is a possible millisecond-pulsar companion.

Abstract Copyright: © ESO, 2016

Journal keyword(s): methods: data analysis - techniques: imaging spectroscopy - planets and satellites: fundamental parameters - stars: atmospheres - pulsars: general - globular clusters: individual: NGC 6397

VizieR on-line data: <Available at CDS (J/A+A/588/A148): sources.dat list.dat fits/* >

Nomenclature: [HKD2016] NNNNNNNN N=2758 among (Nos 11000001-24000582).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 8

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2021.06.13-18:34:45

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