2015A&A...574A..80V


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.14CEST18:28:12

2015A&A...574A..80V - Astronomy and Astrophysics, volume 574A, 80-80 (2015/2-1)

High-resolution CRIRES spectra of Terzan 1: a metal-poor globular cluster toward the inner bulge.

VALENTI E., ORIGLIA L., MUCCIARELLI A. and RICH R.M.

Abstract (from CDS):

Containing the oldest stars in the Galaxy, globular clusters toward the bulge can be used to trace its dynamical and chemical evolution. In the bulge direction, there are ∼50 clusters, but only about 20% have been subject of high-resolution spectroscopic investigations. So far, the sample observed at high resolution spans a moderate-to-high metallicity regime. In this sample, however, very few are located in the innermost region (RGC≤1.5 Kpc and |l, b|≤5°). To constrain the chemical evolution enrichment of the innermost region of Galaxy, accurate abundances and abundance patterns of key elements based on high-resolution spectroscopy are necessary. Here we present the results we obtained for Terzan1, a metal-poor cluster located in the innermost bulge region. Using the near-infrared spectrograph CRIRES at ESO/VLT, we obtained high-resolution (R≃50000) H-band spectra of 16 bright giant stars in the innermost region (r≤60'') of Terzan 1. Full spectral synthesis techniques and equivalent width measurements of selected lines, isolated and free of significant blending and/or contamination by telluric lines, allowed accurate chemical abundances and radial velocities to be derived. Fifteen out of 16 observed stars are likely cluster members, with an average heliocentric radial velocity of +57±1.8km/s and mean iron abundance of [Fe/H]=-1.26±0.03dex. For these stars we measured some [α/Fe] abundance ratios, finding average values of [O/Fe]=+0.39±0.02dex, [Mg/Fe]=+0.42±0.02dex, [Si/Fe]=+0.31±0.04dex, and [Ti/Fe]=+0.15±0.04dex The α enhancement (≃+0.4dex) found in the observed giant stars of Terzan 1 is consistent with previous measurements on other, more metal-rich bulge clusters, which suggests a rapid chemical enrichment.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: abundances - stars: Population II - globular clusters: individual: Terzan 1 - infrared: stars

Nomenclature: Tables 1-2: [VOM2015] NN (Nos 1-16).

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GCl 66.1 GlC 17 30 38.90 -31 35 44.0           ~ 101 0
2 [VOM2015] 8 * 17 35 45.4594 -30 28 40.994           ~ 1 0
3 [VOM2015] 9 * 17 35 45.6336 -30 28 36.725           ~ 1 0
4 2MASS J17354592-3028451 * 17 35 45.9097712065 -30 28 45.060072730           ~ 2 0
5 Cl* Terzan 1 IBP 6 * 17 35 45.9944 -30 28 50.657     19.62     ~ 3 0
6 Cl* Terzan 1 IBP 5 * 17 35 46.3277 -30 29 17.106     18.66     ~ 3 0
7 [VOM2015] 11 * 17 35 46.8365 -30 28 33.017           ~ 1 0
8 Cl* Terzan 1 IBP 9 * 17 35 46.9840 -30 28 24.167     18.73     ~ 3 0
9 Cl* Terzan 1 IBP 7 * 17 35 47.0561 -30 28 41.182     19.15     ~ 3 0
10 [VOM2015] 10 * 17 35 47.3546 -30 28 27.426           ~ 1 0
11 [VOM2015] 15 * 17 35 47.5402 -30 28 42.827           ~ 1 0
12 ESO 455-23 GlC 17 35 47.80 -30 28 11.0           ~ 210 0
13 [VOM2015] 13 * 17 35 47.8822 -30 28 59.635           ~ 1 0
14 2MASS J17354811-3028511 LP? 17 35 48.1116790968 -30 28 51.235871476     18.51     ~ 4 0
15 Cl* Terzan 1 IBP 13 * 17 35 49.5484 -30 28 58.668     19.26     ~ 3 0
16 [VOM2015] 2 * 17 35 49.6351 -30 28 57.680           ~ 1 0
17 Cl* Terzan 1 IBP 16 * 17 35 49.7611 -30 28 45.822     19.45     ~ 3 0
18 Cl* Terzan 1 IBP 11 * 17 35 49.7611 -30 28 45.822     18.96     ~ 2 0
19 Cl* Terzan 1 IBP 12 * 17 35 49.7935 -30 28 49.206     19.07     ~ 3 0
20 NAME Galactic Bulge reg ~ ~           ~ 3604 0

    Equat.    Gal    SGal    Ecl

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