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Precise Fourier parameters of Cepheid radial velocity curves: Towards refining the Hertzsprung progression models
Smolec, R.; Moskalik, P.; Gorynya, N. A. +3 more
Context. Radial velocity (RV) curves of Classical Cepheids allow precise determination of the resonant periods, which in turn help to constrain fundamental parameters of these stars. The RV curves of Cepheids are also useful for identifying their pulsation modes and for distance determination using the parallax-of-pulsation method. Aims. The prima…
The largest metallicity difference in twin systems: High-precision abundance analysis of the benchmark pair Krios and Kronos
Petrucci, R.; Jofré, E.; Jaque Arancibia, M. +7 more
Aims: We conducted a high-precision differential abundance analysis of the remarkable binary system HD 240429/30 (Krios and Kronos, respectively), whose difference in metallicity is one of the highest detected to date in systems with similar components (~0.20 dex). A condensation temperature TC trend study was performed to search f…
Quasar Sightline and Galaxy Evolution (QSAGE) - III. The mass-metallicity and fundamental metallicity relation of z ≈ 2.2 galaxies
Cullen, F.; Tejos, N.; Prochaska, J. X. +8 more
We present analysis of the mass-metallicity relation (MZR) for a sample of 67 [O III]-selected star-forming (SF) galaxies at a redshift range of z = 1.99-2.32 (zmed = 2.16) using Hubble Space Telescope Wide Field Camera 3 grism spectroscopy from the Quasar Sightline and Galaxy Evolution survey. Metallicities were determined using empiri…
Cataclysmic variables around the period-bounce: An eROSITA-enhanced multiwavelength catalog
Stelzer, Beate; Schwope, Axel; Muñoz-Giraldo, Daniela
Context. Cataclysmic variables (CVs) with degenerate donors that have evolved past the period minimum are predicted to make up a great portion of the CV population, namely, between 40% and 80%. However, either due to shortcomings in the models or the intrinsic faintness of these strongly evolved systems, only a few of these so-called "period-bounc…
Radial Distribution of Electron Quasi-thermal Noise in the Outer Heliosphere
Chen, Ling; Li, Yi-Lun; Wu De, Jin
Voyager 1 and 2 are only the two spacecraft that have arrived and passed through the heliospheric boundaries. Based on the plasma data from the Voyager 2 spacecraft, the electron quasi-thermal noise (QTN) is investigated by using of the electron population model consisting of a core with Maxwellian distribution and a halo with kappa distribution. …
The properties and kinematics of HCN emission across the closest starburst galaxy NGC 253 observed with ALMA
Chevance, M.; Schinnerer, E.; Klessen, R. S. +21 more
Context. Investigating molecular gas tracers, such as hydrogen cyanide (HCN), to probe higher densities than CO emission across nearby galaxies remains challenging. This is due to the large observing times required to detect HCN at a high sensitivity and spatial resolution. Although approximate kiloparsec scales of HCN maps are available for tens …
Bulge+disc decomposition of HFF and CANDELS galaxies: UVJ diagrams and stellar mass-size relations of galaxy components at 0.2 ≤ z ≤ 1.5
Kartaltepe, Jeyhan S.; Koekemoer, Anton M.; Martis, Nicholas S. +13 more
Using deep imaging from the CANDELS and HFF surveys, we present bulge+disc decompositions with GALFITM for $\sim$17 000 galaxies over $0.2 \le z\le 1.5$. We use various model parameters to select reliable samples of discs and bulges, and derive their stellar masses using an empirically calibrated relation between mass-to-light ratio and colour. Ac…
TESS photometry and CAOS spectroscopy of six eclipsing binaries with Am components
Frasca, A.; Alonso-Santiago, J.; Catanzaro, G. +1 more
In this paper, we present the results of a comprehensive study of six eclipsing binaries whose components are confirmed or suspected Am stars. By combining long-term, high-resolution Catania Astrophysical Observatory Spectropolarimeter (CAOS) spectroscopy and TESS photometry, we have been able to accurately obtain the orbital parameters of each sy…
Protoplanetary Disks around Sun-like Stars Appear to Live Longer When the Metallicity is Low
Hirschauer, Alec S.; Fahrion, Katja; Lenkić, Laura +17 more
Previous Hubble Space Telescope observations of the star-forming cluster NGC 346 in the Small Magellanic Cloud (SMC) revealed a large population of pre-main-sequence (PMS) candidates, characterized by Hα excess emission in their photometry. However, without access to spectroscopy, the nature of these objects remained unclear. Using the NIRSpec ins…
Signature of systemic rotation in 21 galactic globular clusters from APOGEE-2
Minniti, Dante; Schiavon, Ricardo P.; Lane, Richard R. +2 more
Context. Traditionally, globular clusters (GCs) have been assumed to be quasi-relaxed non-rotating systems, characterized by spherical symmetry and orbital isotropy. However, in recent years, a growing set of observational evidence has been unveiling an unexpected dynamical complexity in Galactic GCs. Indeed, kinematic studies have demonstrated th…