J/A+A/572/A88 Measured equivalent widths for Fornax RGB stars (Lemasle+, 2014)
VLT/FLAMES spectroscopy of red giant branch stars in the Fornax dwarf
spheroidal galaxy.
Lemasle B., de Boer T., Hill V., Tolstoy E., Irwin M., Jablonka P.,
Venn K., Battaglia G., Starkenburg E., Shetrone M., Letarte B., Francois P.,
Helmi A., Primas F., Kaufer A., Szeifert T.
<Astron. Astrophys. 572, A88 (2014)>
=2014A&A...572A..88L 2014A&A...572A..88L
ADC_Keywords: Abundances ; Galaxies, nearby ; Stars, late-type ;
Equivalent widths
Keywords: stars: abundances - galaxies: individual: Fornax - galaxies: evolution
Abstract:
Fornax is one of the most massive dwarf spheroidal galaxies in the
Local Group. The Fornax field star population is dominated by
intermediate age stars but star formation was going on over almost its
entire history. It has been proposed that Fornax experienced a minor
merger event. Despite recent progress, only the high metallicity end
of Fornax field stars ([Fe/H]>-1.2dex) has been sampled in larger
number via high resolution spectroscopy. We want to better understand
the full chemical evolution of this galaxy by better sampling the
whole metallicity range, including more metal poor stars. We use the
VLT-FLAMES multi-fibre spectrograph in high-resolution mode to
determine the abundances of several alpha, iron-peak and
neutron-capture elements in a sample of 47 individual Red Giant Branch
stars in the Fornax dwarf spheroidal galaxy. We combine these
abundances with accurate age estimates derived from the age
probability distribution from the colour-magnitude diagram of Fornax.
Similar to other dwarf spheroidal galaxies, the old, metal-poor stars
of Fornax are typically alpha-rich while the young metal-rich stars
are alpha-poor. In the classical scenario of the time delay between
Type II (SNe II) and Type Ia Supernovae (SNe Ia), we confirm that SNe
Ia started to contribute to the chemical enrichment at [Fe/H] between
-2.0 and -1.8dex. We find that the onset of SNe Ia took place between
12-10Gyrs ago. The high values of [Ba/Fe], [La/Fe] reflect the
influence of SNe Ia and AGB stars in the abundance pattern of the
younger stellar population of Fornax. Our findings of low [alpha/Fe]
and enhanced [Eu/Mg] are compatible with an initial mass function that
lacks the most massive stars and with star formation that kept going
on throughout the whole history of Fornax. We find that massive stars
kept enriching the interstellar medium in alpha-elements, although
they were not the main contributor to the iron enrichment.
Description:
List of all the absorption lines (Wavelength, element), their atomic
parameters (excitation potential, log gf) and their measured
equivalent widths (EW, in mAngstroms), measured by DAOSPEC in 47
Fornax RGB stars.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea3.dat 93 58 Positional, photometric and kinematic data for
our targets
table7.dat 307 154 Equivalent widths for 37 stars
table3.dat 53 47 Atmospheric parameters Teff, logg, Vt and [Fe/H]
for stars in our sample
tablea5.dat 91 141 Individual abundances for the RGB stars in our
sample
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See also:
J/AJ/127/840 : VRI photometry of Fornax red giants (Pont+, 2004)
J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006)
J/A+A/467/1025 : JHK photometry of Fornax red giant branch (Gullieuszik+ 2007)
J/A+A/572/A82 : Abundances in outer parts of Fornax dSph (Hendricks+, 2014)
J/MNRAS/394/795 : AGB stars in Fornax dwarf spheroidal galaxy (Whitelock+ 2009)
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [Fnx-]
5- 11 A7 --- Name Name (rgbNNNN or Fnx-memNNNN, for
RGB Fornax members or other members)
13 I1 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 42 F6.3 mag Bmag ?=- CTIO/MOSAIC B magnitude
44- 49 F6.3 mag Vmag [18.1/18.9] CTIO/MOSAIC V magnitude
51- 56 F6.3 mag Imag ?=- CTIO/MOSAIC (or ESO/WFI) I magnitude
58- 63 F6.3 mag Jmag ?=- ESO VISTA J magnitude
65- 70 F6.3 mag Hmag ?=- ESO VISTA H magnitude
72- 77 F6.3 mag Kmag ?=- ESO VISTA Ks magnitude
79- 82 F4.1 km/s RV [4/84] Radial velocity
84- 87 F4.2 km/s e_RV rms uncertainty on RV
89- 93 A5 --- EW Name of the column in table7 with
equivalent widths for this source
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 8 F7.2 0.1nm lambda Wavelength
10- 12 A3 --- El Element
14- 18 F5.3 eV EP Excitation potential
20- 25 F6.3 --- loggf Oscillator strength
27- 31 F5.1 0.1pm m0514 ? Equivalent width (mÅ) for Fnx-mem0514
33- 37 F5.1 0.1pm m0522 ? Equivalent width (mÅ) for Fnx-mem0522
39- 43 F5.1 0.1pm m0532 ? Equivalent width (mÅ) for Fnx-mem0532
45- 49 F5.1 0.1pm m0539 ? Equivalent width (mÅ) for Fnx-mem0539
51- 55 F5.1 0.1pm m0543 ? Equivalent width (mÅ) for Fnx-mem0543
57- 61 F5.1 0.1pm m0556 ? Equivalent width (mÅ) for Fnx-mem0556
63- 67 F5.1 0.1pm m0572 ? Equivalent width (mÅ) for Fnx-mem0572
69- 73 F5.1 0.1pm m0574 ? Equivalent width (mÅ) for Fnx-mem0574
75- 79 F5.1 0.1pm m0584 ? Equivalent width (mÅ) for Fnx-mem0584
81- 85 F5.1 0.1pm m0595 ? Equivalent width (mÅ) for Fnx-mem0595
87- 91 F5.1 0.1pm m0598 ? Equivalent width (mÅ) for Fnx-mem0598
93- 97 F5.1 0.1pm m0604 ? Equivalent width (mÅ) for Fnx-mem0604
99-103 F5.1 0.1pm m0606 ? Equivalent width (mÅ) for Fnx-mem0606
105-109 F5.1 0.1pm m0607 ? Equivalent width (mÅ) for Fnx-mem0607
111-115 F5.1 0.1pm m0612 ? Equivalent width (mÅ) for Fnx-mem0612
117-121 F5.1 0.1pm m0613 ? Equivalent width (mÅ) for Fnx-mem0613
123-127 F5.1 0.1pm m0626 ? Equivalent width (mÅ) for Fnx-mem0626
129-133 F5.1 0.1pm m0629 ? Equivalent width (mÅ) for Fnx-mem0629
135-139 F5.1 0.1pm m0631 ? Equivalent width (mÅ) for Fnx-mem0631
141-145 F5.1 0.1pm m0633 ? Equivalent width (mÅ) for Fnx-mem0633
147-151 F5.1 0.1pm m0634 ? Equivalent width (mÅ) for Fnx-mem0634
153-157 F5.1 0.1pm m0638 ? Equivalent width (mÅ) for Fnx-mem0638
159-163 F5.1 0.1pm m0647 ? Equivalent width (mÅ) for Fnx-mem0647
165-169 F5.1 0.1pm m0654 ? Equivalent width (mÅ) for Fnx-mem0654
171-175 F5.1 0.1pm m0664 ? Equivalent width (mÅ) for Fnx-mem0664
177-181 F5.1 0.1pm m0675 ? Equivalent width (mÅ) for Fnx-mem0675
183-187 F5.1 0.1pm m0678 ? Equivalent width (mÅ) for Fnx-mem0678
189-193 F5.1 0.1pm m0682 ? Equivalent width (mÅ) for Fnx-mem0682
195-199 F5.1 0.1pm m0704 ? Equivalent width (mÅ) for Fnx-mem0704
201-205 F5.1 0.1pm m0712 ? Equivalent width (mÅ) for Fnx-mem0712
207-211 F5.1 0.1pm m0714 ? Equivalent width (mÅ) for Fnx-mem0714
213-217 F5.1 0.1pm m0715 ? Equivalent width (mÅ) for Fnx-mem0715
219-223 F5.1 0.1pm m0717 ? Equivalent width (mÅ) for Fnx-mem0717
225-229 F5.1 0.1pm m0732 ? Equivalent width (mÅ) for Fnx-mem0732
231-235 F5.1 0.1pm m0747 ? Equivalent width (mÅ) for Fnx-mem0747
237-241 F5.1 0.1pm m0754 ? Equivalent width (mÅ) for Fnx-mem0754
243-247 F5.1 0.1pm m0779 ? Equivalent width (mÅ) for Fnx-mem0779
249-253 F5.1 0.1pm r0507 ? Equivalent width (mÅ) for Fnx-rgb0507
255-259 F5.1 0.1pm r0509 ? Equivalent width (mÅ) for Fnx-rgb0509
261-265 F5.1 0.1pm r0522 ? Equivalent width (mÅ) for Fnx-rgb0522
267-271 F5.1 0.1pm r0539 ? Equivalent width (mÅ) for Fnx-rgb0539
273-277 F5.1 0.1pm r0553 ? Equivalent width (mÅ) for Fnx-rgb0553
279-283 F5.1 0.1pm r0556 ? Equivalent width (mÅ) for Fnx-rgb0556
285-289 F5.1 0.1pm r0561 ? Equivalent width (mÅ) for Fnx-rgb0561
291-295 F5.1 0.1pm r0574 ? Equivalent width (mÅ) for Fnx-rgb0574
297-301 F5.1 0.1pm r0590 ? Equivalent width (mÅ) for Fnx-rgb0590
303-307 F5.1 0.1pm r0596 ? Equivalent width (mÅ) for Fnx-rgb0596
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [Fnx-]
5- 11 A7 --- Name Name (rgbNNNN or Fnx-memNNNN, for
RGB Fornax members or other members)
13- 16 I4 K Teff Effective temperature
18- 21 F4.2 [cm/s2] logg Surface gravity
23- 26 F4.2 km/s Vt Microturbulent velocity
28- 32 F5.2 [-] [Fe/H] Metallicity
34 A1 --- l_Age Limt flag on Age
35- 39 F5.2 Gyr Age Age
41- 44 F4.2 Gyr e_Age ? rms uncertainty on Age
46- 47 I2 --- S/NH10 Signal-to-noise ratio (HR10 grating)
49- 50 I2 --- S/NH13 Signal-to-noise ratio (HR13 grating)
52- 53 I2 --- S/NH14 Signal-to-noise ratio (HR14 grating)
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Byte-by-byte Description of file: tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [Fnx-]
5- 11 A7 --- Name Name (rgbNNNN or Fnx-memNNNN, for
RGB Fornax members or other members)
13- 17 F5.2 [-] [FeI/H] Abundance [FeI/H]
19- 22 F4.2 [-] e_[FeI/H] rms uncertainty on [FeI/H]
24- 25 I2 --- o_[FeI/H] Number of lines used for [FeI/H]
27- 31 F5.2 [-] [FeII/H] ? Abundance [FeII/H]
33- 36 F4.2 [-] e_[FeII/H] ? rms uncertainty on [FeII/H]
38 I1 --- o_[FeII/H] ? Number of lines used for [FeII/H]
40- 44 F5.2 [-] [Na/H] ? Abundance [Na/H]
46- 49 F4.2 [-] e_[Na/H] ? rms uncertainty on [Na/H]
51 I1 --- o_[Na/H] ? Number of lines used for [Na/H]
53- 57 F5.2 [-] [Mg/H] ? Abundance [Mg/H]
59- 62 F4.2 [-] e_[Mg/H] ? rms uncertainty on [Mg/H]
64 I1 --- o_[Mg/H] ? Number of lines used for [Mg/H]
66- 70 F5.2 [-] [Si/H] ? Abundance [Si/H]
72- 75 F4.2 [-] e_[Si/H] ? rms uncertainty on [Si/H]
77 I1 --- o_[Si/H] ? Number of lines used for [Si/H]
79- 83 F5.2 [-] [Ca/H] ? Abundance [Ca/H]
85- 88 F4.2 [-] e_[Ca/H] ? rms uncertainty on [Ca/H]
90- 91 I2 --- o_[Ca/H] ? Number of lines used for [Ca/H]
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Acknowledgements:
Bertrand Lemasle, b.j.p.lemasle(at)uva.nl
History:
02-Dec-2014: First only-line version
15-Jan-2016: tables 3 and A5 added (from electronic version)
(End) B. Lemasle [API-UvA, The Netherlands], P. Vannier [CDS] 28-Oct-2014