J/AJ/158/219 Phosphorus abundances in the Hyades and Galactic disk (Maas+, 2019)
Phosphorus abundances in the Hyades and Galactic disk.
Maas Z.G., Cescutti G., Pilachowski C.A.
<Astron. J., 158, 219 (2019)>
=2019AJ....158..219M 2019AJ....158..219M (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Abundances ; Stars, ages ;
Space velocities
Keywords: stellar abundances - Milky Way disk - open star clusters
Abstract:
We have measured phosphorus abundances in nine disk stars between
-1< [Fe/H]< -0.5 and in 12 members of the Hyades open cluster using two
P I lines at 1.06 µm. High-resolution infrared spectra were obtained
using Phoenix on Gemini South and abundances were determined by comparing
synthetic spectra to the observations. The average abundance for the dwarf
stars in our Hyades sample was <[P/Fe]≥-0.01±0.06 and
<[P/Fe]≥0.03±0.03 dex for the three giants. The consistency suggests
that abundances derived using the 1.06 µm P I lines are not subjected
to temperature- or luminosity-dependent systematic effects at high
metallicities. Our [P/Fe] ratios measured in disk stars are consistent
with chemical evolution models with P yields increased by a factor of 2.75.
We find that [P/O], [P/Mg], [P/Si], and [P/Ti] ratios are consistent with
the solar ratio over a range of -1.0<[Fe/H]<0.2 with the [P/Si] ratio
increasing by ∼0.1-0.2 dex at the lowest [Fe/H] ratios. Finally, the
evolution of [P/Fe] with age is similar to other α elements,
providing evidence that P is produced at the same sites.
Description:
Observations were performed using Phoenix (Hinkle et al.
1998SPIE.3354..810H 1998SPIE.3354..810H) on Gemini South as apart of proposal GS-2017B-Q-47.
Phoenix is a high-resolution infrared spectrometer capable of observing
between 1 and 5µm. The 4 pixel slit width was chosen to achieve
a resolution of R∼50000. To observe the P I features at 10581 Å and
10596 Å, we chose a central wavelength of 10593 Å, with a total
range of 50 Å. We only selected stars with known atmospheric parameters
since the spectral region covered by Phoenix contains too few
absorption lines to determine atmospheric parameters independently.
Objects:
----------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------
04 26 54.00 +15 52 00.0 Hyades = Cl Melotte 25
----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 81 50 Star age estimate
--------------------------------------------------------------------------------
See also:
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [HIP]
4- 9 I6 --- HIP [6949/113044] HIP number of object
11- 15 F5.2 [Sun] [Fe/H] [-0.91/0.28] Log Fe/H abundance ratio
17- 20 F4.2 [Sun] e_[Fe/H] [0.03/0.2] Mean uncertainty on [Fe/H]
22- 25 F4.1 Gyr Age [0.9/14.6] Age of star
27- 30 F4.1 Gyr e_Age [0.1/11.2] Lower 2σ uncertainty on Age
32- 35 F4.1 Gyr E_Age [2.9/15.1] Upper 2σ uncertainty on Age
37- 41 F5.2 [Sun] [P/Fe] [-0.12/0.5] Log P/Fe abundance ratio
43- 46 F4.2 [Sun] e_[P/Fe] [0.01/0.17] Mean uncertainty on [P/Fe]
48 I1 --- Ref [1/4] Reference for [P/Fe] and [Fe/H]
abundances (1)
50- 56 F7.2 km/s U [-130.4/84.86] U Galactic velocity component
58- 64 F7.2 km/s V [-101.21/15.87] V Galactic velocity component
66- 71 F6.2 km/s W [-81.68/69.7] W Galactic velocity component
73- 76 F4.2 --- P(Thin) [0/0.99] Thin disk membership probability
78- 81 F4.2 --- P(Thick) [0.01/0.96] Thick disk membership probability
--------------------------------------------------------------------------------
Note (1): Reference as follows:
1 = Caffau et al. (2019A&A...622A..68C 2019A&A...622A..68C);
2 = This work;
3 = Maas et al. (2017ApJ...841..108M 2017ApJ...841..108M);
4 = Caffau et al. (2011A&A...540A..33C 2011A&A...540A..33C).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 21-Jan-2020