Search Publications
Distance and stellar parameter estimations of solar-like stars from the LAMOST spectroscopic survey
Luo, A. -Li; Shen, Yue-Yue
Context. The Gaia mission has opened up a new era for the precise astrometry of stars, thus revolutionizing our understanding of the Milky Way. However, beyond a few kiloparseconds from the Sun, parallax measurements become less reliable, and even within 2 kpc, there still exist stars with large uncertainties. Aims. Our aim was to determine the di…
Stellar population astrophysics with the TNG. Abundance analysis of nearby red giants and red clump stars: Combining high-resolution spectroscopy and asteroseismology
Miglio, Andrea; Bragaglia, Angela; Lucatello, Sara +4 more
Context. Asteroseismology, a powerful approach for obtaining internal structure and stellar properties, requires surface temperature and chemical composition information to determine mass and age. High-resolution spectroscopy is a valuable technique for precise stellar parameters (including surface temperature) and for an analysis of the chemical …
Using CSST and ejecta-wind interaction in type II-P supernovae to constrain the wind-mass loss of red supergiant stars
Chen, Xuefei; Dessart, Luc; Luo, Jingxiao +1 more
The properties of H-rich, type II-plateau supernova (SN II-P) progenitors remain uncertain, and this is primarily due to the complexities associated with red supergiant (RSG) mass loss. Recent studies have suggested that the interaction of the ejecta with a standard RSG wind should produce unambiguous signatures in the optical (e.g., a broad, boxy…
The diversity of spectral shapes of hydrogen Lyman lines and Mg II lines in a quiescent prominence
Heinzel, P.; Gunár, S.; Schwartz, P. +1 more
Context. Broad sets of spectroscopic observations comprising multiple lines represent an excellent opportunity for diagnostics of the properties of the prominence plasma and the dynamics of their fine structures. However, they also bring significant challenges when they are compared with synthetic spectra provided by radiative transfer modeling. <…
Spectroscopic survey of faint planetary-nebula nuclei: VI. Seventeen hydrogen-rich central stars
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
We present an analysis of 17 H-rich central stars of planetary nebulae (PNe) observed in our spectroscopic survey of nuclei of faint Galactic PNe carried out at the 10-m Hobby-Eberly Telescope. Our sample includes ten O(H) stars, four DAO white dwarfs (WDs), two DA WDs, and one sdOB star. The spectra were analyzed by means of NLTE model atmosphere…
Gaia Data Release 3. Summary of the content and survey properties
Prusti, T.; Mazeh, T.; Zucker, S. +453 more
Context. We present the third data release of the European Space Agency's Gaia mission, Gaia DR3. This release includes a large variety of new data products, notably a much expanded radial velocity survey and a very extensive astrophysical characterisation of Gaia sources.
Aims: We outline the content and the properties of Gaia DR3, providing…
JADES NIRSpec Spectroscopy of GN-z11: Lyman-α emission and possible enhanced nitrogen abundance in a z = 10.60 luminous galaxy
Chevallard, Jacopo; Maseda, Michael V.; Parlanti, Eleonora +60 more
We present JADES JWST/NIRSpec spectroscopy of GN-z11, the most luminous candidate z > 10 Lyman break galaxy in the GOODS-North field with MUV = −21.5. We derive a redshift of z = 10.603 (lower than previous determinations) based on multiple emission lines in our low and medium resolution spectra over 0.7 − 5.3 µm. We significan…
Gaia Data Release 3. Properties and validation of the radial velocities
Smith, M.; Gosset, E.; Caffau, E. +47 more
Context. Gaia Data Release 3 (Gaia DR3) contains the second release of the combined radial velocities. It is based on the spectra collected during the first 34 months of the nominal mission. The longer time baseline and the improvements of the pipeline made it possible to push the processing limit from GRVS = 12 in Gaia DR2 to GRVS…
Gaia Data Release 3. Stellar multiplicity, a teaser for the hidden treasure
Prusti, T.; Mazeh, T.; Zucker, S. +448 more
Context. The Gaia DR3 catalogue contains, for the first time, about 800 000 solutions with either orbital elements or trend parameters for astrometric, spectroscopic, and eclipsing binaries, and combinations of these three.
Aims: With this paper, we aim to illustrate the huge potential of this large non-single-star catalogue.
Methods: Us…
GA-NIFS: A massive black hole in a low-metallicity AGN at z ∼ 5.55 revealed by JWST/NIRSpec IFS
Pérez-González, Pablo G.; Charlot, Stéphane; Carniani, Stefano +20 more
We present rest-frame optical data of the compact z = 5.55 galaxy GS_3073 obtained using the integral field spectroscopy mode of the Near-InfraRed Spectrograph on board the James Webb Space Telescope. The galaxy's prominent broad components in several hydrogen and helium lines (though absent in the forbidden lines) and v detection of a large equiv…