2016A&A...588A.148H


Query : 2016A&A...588A.148H

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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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3747 0
2 HD 84937 PM* 09 48 56.0992891997 +13 44 39.326709913 8.49 8.68 8.32 7.97 7.70 F8Vm-5 756 0
3 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 803 0
4 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 896 0
5 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1771 0
6 NGC 6397 162 HS* 17 40 38.4613882368 -53 38 31.347142908   13.06 13.23     sdOp 40 1
7 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1892 1
8 Cl* NGC 6397 SAW V31 BY* 17 40 42.567 -53 40 27.93   16.41 15.95 16.10   ~ 12 0

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2022.09.24-18:47:15

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