J/A+A/583/A69 NGC 6139 BV photometry (Bragaglia+, 2015)
NGC 6139: a normal massive globular cluster or a first-generation dominated
cluster? Clues from the light elements.
Bragaglia A., Carretta E., Sollima A., Donati P., D'Orazi V., Gratton R.G.,
Lucatello S., Sneden C.
<Astron. Astrophys. 583, A69 (2015)>
=2015A&A...583A..69B 2015A&A...583A..69B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, UBV ; Abundances
Keywords: stars: abundances - stars: atmospheres - stars: Population II -
Galaxy: general - globular clusters: general -
globular clusters: individual: NGC 6139
Abstract:
Information on globular clusters (GC) formation mechanisms can be
gathered by studying the chemical signature of the multiple
populations that compose these stellar systems. In particular, we
investigate the anti-correlations among O, Na, Al, and Mg to explore
the influence of cluster mass and environment on GCs in the Milky Way
and in extragalactic systems. We present here the results obtained on
NGC 6139, which, on the basis of its horizontal branch morphology, has
been proposed to be dominated by first-generation stars. In our
extensive study based on high-resolution spectroscopy, the first for
this cluster, we found a metallicity of
[Fe/H]=-1.579±0.015±0.058 (rms=0.040dex, 45 bona fide member
stars) on the UVES scale defined by our group. The stars in NGC 6139
show a chemical pattern normal for GCs, with a rather extended Na-O
(and Mg-Al) anticorrelation. NGC 6139 behaves as expected from its
mass and contains a large portion (about two thirds) of
second-generation stars.
Description:
We retrieved from the ESO archive some B and V filter frames acquired
(under program 68.D-0265) with the Wide Field Imager (WFI) at the 2.2m
ESO-MPG telescope, which has a FoV of about 30' side.
NGC 6139 was observed with the multi-object spectrograph FLAMES at
VLT. We used the GIRAFFE high-resolution setups HR11, HR13, and HR21
(R=24200, 22500, 16200, respectively), which contain two Na doublets,
the [OI] line at 6300Å, and the Al doublet at 8772Å, plus several
Mg lines.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phottab.dat 79 50711 Photometric catalogue
tablea1.dat 83 48 Information on the member stars observed
tablea2.dat 70 64 Information on non-member stars on the basis of
RV or metallicity, all observed with GIRAFFE
tablea3.dat 64 45 Adopted atmospheric parameters and derived
metallicity for confirmed member stars
tablea4.dat 71 45 Light-element abundances for confirmed member
stars
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See also:
J/PAZh/22/764 : Photometry of the globular cluster NGC 6139 (Samus+, 1996)
J/A+A/540/A27 : Spectroscopy in Galactic globular clusters (Saviane+, 2012)
Byte-by-byte Description of file: phottab.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 12 F6.3 s RAs Right ascension (J2000)
14 A1 --- DE- Declination sign (J2000)
15- 16 I2 deg DEd Declination (J2000)
18- 19 I2 arcmin DEm Declination (J2000)
21- 25 F5.2 arcsec DEs Declination (J2000)
27- 32 F6.3 mag Bmag B magnitude
34- 38 F5.3 mag e_Bmag rms uncertainty on Bmag
40- 45 F6.3 mag Vmag V magnitude
47- 51 F5.3 mag e_Vmag rms uncertainty on Vmag
53- 58 F6.3 --- chiBmag chi on Bmag (DAOPHOT-II)
60- 65 F6.3 --- shaBmag Sharpness parameter on Bmag (DAOPHOT-II)
67- 72 F6.3 --- chiVmag chi on Vmag (DAOPHOT-II)
74- 79 F6.3 --- shaVmag Sharpness parameter on Vmag (DAOPHOT-II)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID ID for spectra (tNNNNN)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
33- 38 F6.3 mag Vmag V magnitude
40- 45 F6.3 mag Bmag B magnitude
47- 52 F6.3 mag Kmag ? 2MASS K magnitude
54- 60 F7.2 km/s HRV ? Heliocentric radial velocity
62- 66 F5.2 km/s e_HRV ? rms uncertainty on HRV
68 A1 --- Type [UG] UVES (U) or GIRAFFE (G)
70- 83 A14 --- Notes Note (1)
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Note (1): AGB indicates a probable AGB star.
RV(num)=xx indicates the RV of star num in Saviane et al.
(2012, Cat. J/A+A/540/A27).
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID ID for spectra (tNNNNN)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
33- 38 F6.3 mag Vmag V magnitude
40- 45 F6.3 mag Bmag B magnitude
47- 52 F6.3 mag Kmag ? 2MASS K magnitude
54- 60 F7.2 km/s HRV Heliocentric radial velocity
62- 66 F5.2 km/s e_HRV Error on HRV
68- 70 A3 --- Note [RV met] Discarded by RV or metallicity
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID ID for spectra (tNNNNN)
9- 12 I4 K Teff Temperture
14- 17 F4.2 [cm/s2] logg Surface gravity
19- 23 F5.2 [-] [A/H] Model metallicity
25- 28 F4.2 km/s Vt Microturbulent velocity
30- 32 I3 --- o_FeI Number of FeI lines
34- 39 F6.3 [-] [Fe/H]I Neutral Fe abundance
41- 45 F5.3 [-] e_[Fe/H]I rms uncertainty on [Fe/H]I
47- 49 I3 --- o_FeII Number of FeII lines
51- 56 F6.3 [-] [Fe/H]II Ionised Fe abundance
58- 62 F5.3 [-] e_[Fe/H]II ? rms uncertainty on [Fe/H]II
64 A1 --- Type UVES (U) or GIRAFFE (G)
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID ID for spectra (tNNNNN)
8 I1 --- o_O ? Number of O lines
10 A1 --- l_[O/Fe] [l] Limit flag on [O/Fe]
11- 16 F6.3 [-] [O/Fe] ? Abundance ratio [O/Fe]
18- 22 F5.3 [-] e_[O/Fe] ? rms for O
24 I1 --- o_Na Number of Na lines
26- 31 F6.3 [-] [Na/Fe] Abundance ratio [Na/Fe]
33- 37 F5.3 [-] e_[Na/Fe] ? rms for Na
39 I1 --- o_Mg Number of Mg lines
41- 46 F6.3 [-] [Mg/Fe] Abundance ratio [Mg/Fe]
48- 52 F5.3 [-] e_[Mg/Fe] ? rms for Mg
54 I1 --- o_Al Number of Al lines
56- 61 F6.3 [-] [Al/Fe] Abundance ratio [Al/Fe]
63- 67 F5.3 [-] e_[Al/Fe] ? rms for Al
69 A1 --- Type [U/G] UVES (U) or GIRAFFE (G)
71 A1 --- Pop [PI] Population (1)
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Note (1): Population (according to Carretta et al., 2009A&A...505..117C 2009A&A...505..117C)
as follows:
P = primordial (first generation)
I = intermediate (second generation, with intermediate modified composition)
E = extreme (second generation with extreme modified composition - they are
not present in NGC6139)
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Acknowledgements:
Angela Bragaglia, angela.bragaglia(at)oabo.inaf.it
(End) Patricia Vannier [CDS] 14-Sep-2015