The CARMENES search for exoplanets around M dwarfs Magnesium and silicon abundances of K7-M5.5 stars

被引：1
|
作者：
Tabernero, H. M. [1 ,2 ,3 ]
Shan, Y. [4 ,5 ]
Caballero, J. A. [6 ]
Duque-Arribas, C. [1 ,2 ]
Montes, D. [1 ,2 ]
Hernandez, J. I. Gonzalez [7 ,8 ]
Osorio, M. R. Zapatero [6 ]
Schweitzer, A. [9 ]
Henning, Th. [10 ]
Cortes-Contreras, M. [1 ,2 ]
Quirrenbach, A. [11 ]
Amado, P. J. [12 ]
Reiners, A. [4 ]
Ribas, I. [13 ,14 ]
Bergond, G. [15 ]
Morales, J. C. [13 ,14 ]
机构：
[1] Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra & Astrofis, Madrid 28040, Spain
[2] Univ Complutense Madrid, Fac Ciencias Fis, IPARCOS UCM Inst Fis Particulas & Cosmos UCM, Madrid 28040, Spain
[3] CSIC INTA, Ctr Astrobiol, Carretera Ajalvir Km 4, Torrejon De Ardoz 28850, Madrid, Spain
[4] Georg August Univ Gottingen, Inst Astrophys & Geophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany
[5] Univ Oslo, Ctr Planetary Habitabil, Dept Geosci, Sem Saelands Vei 2b, N-0315 Oslo, Norway
[6] CSIC INTA, Ctr Astrobiol, Camino Bajo Castillo S-N, Villanueva De La Canada 28691, Madrid, Spain
[7] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Tenerife, Spain
[8] Inst Astrofis Canarias, C Via Lactea S-N, San Cristobal la Laguna 38205, Tenerife, Spain
[9] Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
[10] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[11] Heidelberg Univ, Landessternwarte, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany
[12] Inst Astrofis Andalucia IAA CSIC, Glorieta Astron S-N, Granada 18008, Spain
[13] Inst Ciencies Espai CSIC, Campus UAB, C Can Magrans S-N, Cerdanyola Del Valles 08193, Spain
[14] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain
[15] Ctr Astron Hispano Aleman, Observ Calar Alto, Sierra Filabres, Gergal 04550, Almeria, Spain
来源：
ASTRONOMY & ASTROPHYSICS | 2024年 / 689卷
关键词：
methods: data analysis; techniques: spectroscopic; stars: abundances; stars: atmospheres; stars: fundamental parameters; stars: late-type; CONSTRAINING PLANET STRUCTURE; LOW-MASS STARS; HIGH-RESOLUTION; ELEMENTAL ABUNDANCES; CHEMICAL ABUNDANCES; TERRESTRIAL PLANETS; EXTRASOLAR PLANETS; STELLAR PARAMETERS; ATOMIC DIFFUSION; GALACTIC THIN;
D O I：
10.1051/0004-6361/202450054
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the abundances of magnesium (Mg) and silicon (Si) for 314 dwarf stars with spectral types in the interval K7.0-M5.5 (Teff range approximate to 4200-3050 K) observed with the CARMENES high-resolution spectrograph at the 3.5 m telescope at the Calar Alto Observatory. Our analysis employs the BT-Settl model atmospheres, the radiative transfer code Turbospectrum, and a state-of-the-art selection of atomic and molecular data. These Mg and Si abundances are critical for understanding both the chemical evolution and assembly of the Milky Way and the formation and composition of rocky planets. Our chemical abundances show a line-to-line scatter at the level of 0.1 dex for all studied spectral types. The typical error bar of our chemical abundance measurements is +/- 0.11 dex (Mg) and +/- 0.16 dex (Si) for all spectral types based on the comparison of the results obtained for stellar components of multiple systems. The derived abundances are consistent with the galactic evolution trends and observed chemical abundance distribution of earlier FGK-type stars in the solar neighbourhood. Besides, our analysis provides compatible abundances for stars in multiple systems. In addition, we studied the abundances of different galactic stellar populations. In this paper, we also explore the relation of the Mg and Si abundances of stars with and without known planets.
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页数：10
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