2023A&A...671A.171W


Query : 2023A&A...671A.171W

2023A&A...671A.171W - Astronomy and Astrophysics, volume 671A, 171 (2023/3-1)

PySME Spectroscopy Made Easier.

WEHRHAHN A., PISKUNOV N. and RYABCHIKOVA T.

Abstract (from CDS):

Context. The characterization of exoplanets requires the reliable determination of the fundamental parameters of their host stars. Spectral fitting plays an important role in this process. For the majority of stellar parameters, matching synthetic spectra to the observations provides a robust and unique solution for the fundamental parameters, such as effective temperature, surface gravity, abundances, radial and rotational velocities, among others.
Aims. Here, we present a new software package for fitting high-resolution stellar spectra that is easy to use, available for common platforms, and free from commercial licenses. We call it PySME. It is based on the proven Spectroscopy Made Easy package, later referred to as IDL SME or “original” SME.
Methods. The IDL (Interactive Data Language) part of the original SME code has been rewritten in Python, but we kept the efficient C++ and FORTRAN code responsible for molecular-ionization equilibrium, opacities, and spectral synthesis. In the process we updated some components of the optimization procedure to offer more flexibility and better analysis of the convergence. The result is a more modern package with the same functionality as the original SME.
Results. We applied PySME to a few stars of different spectral types and compared the derived fundamental parameters with the results from IDL SME and other techniques. We show that PySME works at least as well as the original SME.

Abstract Copyright: © The Authors 2023

Journal keyword(s): techniques: spectroscopic - methods: data analysis - methods: numerical - stars: fundamental parameters - stars: solar-type

VizieR on-line data: <Available at CDS (J/A+A/671/A171): pysme.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 10069 SB* 01 37 25.0332798696 -45 40 40.374717456   9.74 9.30     F6IV/V 230 1
2 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 1934 1
3 * rho01 Cnc EB* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1123 1
4 * rho01 Cnc B PM* 08 52 40.8627422125 +28 18 58.821345244   14.80   12.814   M4.5V 150 0
5 HD 102195 PM* 11 45 42.2928676296 +02 49 17.324140440       7.6   K0V 143 1
6 HD 130322 PM* 14 47 32.7262287384 -00 16 53.307811560   8.82 8.04     K0V 276 1
7 HD 148816 PM* 16 30 28.4586254384 +04 10 41.602836534 7.75 7.81 7.28 6.82 6.49 F7V 310 0
8 HD 179949 BY* 19 15 33.2300695008 -24 10 45.671448072   6.772 6.237     F8V 405 1
9 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 897 1
10 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 516 0

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