M. Giarrusso
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View article: A Novel Polarimetric Approach for Sun Center Determination and In-Flight Calibration Using Metis Coronagraph on Solar Orbiter
A Novel Polarimetric Approach for Sun Center Determination and In-Flight Calibration Using Metis Coronagraph on Solar Orbiter Open
In both coronagraphic and total solar eclipse observations, the solar disk is not directly visible. Blocking direct light from the photosphere is essential to observe the visible solar corona, which is $10^{-5}$ to $10^{-11}$ o…
View article: Pulsating and Nonpulsating Components of Detached Eclipsing Binaries in the <i>δ</i> Scuti Instability Strip
Pulsating and Nonpulsating Components of Detached Eclipsing Binaries in the <i>δ</i> Scuti Instability Strip Open
Pulsating detached eclipsing binary systems are crucial for studying the internal structure of oscillating stars. These systems are advantageous because binary effects on pulsations are minimal, allowing for more accurate determinations of…
View article: Super-slowly rotating Ap (ssrAp) stars: New spectroscopic observations
Super-slowly rotating Ap (ssrAp) stars: New spectroscopic observations Open
The rotation periods of Ap stars range over five to six orders of magnitude. The origin of their differentiation remains unknown. We carry out a systematic study of the longest period Ap stars to gain insight into their properties. We anal…
View article: Pulsating and Non-pulsating Components of Detached Eclipsing Binaries in the $δ$ Scuti instability strip
Pulsating and Non-pulsating Components of Detached Eclipsing Binaries in the $δ$ Scuti instability strip Open
Pulsating detached eclipsing binary systems are crucial for studying the internal structure of oscillating stars. These systems are advantageous because binary effects on pulsations are minimal, allowing for more accurate determinations of…
View article: Discovery of the binary nature of the magnetospheric B-type star <i>ρ</i> Oph A
Discovery of the binary nature of the magnetospheric B-type star <i>ρ</i> Oph A Open
Context . The nearby B-type star ρ Oph A was recently identified as a rapidly rotating magnetic B-type star with variable radio and X-ray emission consistent with a magnetospheric origin. Aims . We aim to refine constraints on ρ Oph A’s ma…
View article: Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes
Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes Open
An error occurred during the production process. Some units have been mistakenly changed in the text: each “mm” (millimeter) unit should read “Mm” (megameter).
View article: Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes
Study of solar brightness profiles in the 18–26 GHz frequency range with INAF radio telescopes Open
Context. One of the most important objectives of solar physics is to gain a physical understanding of the solar atmosphere, whose structure can also be described in terms of the density ( N ) and temperature ( T ) distributions of the atmo…
View article: Study of solar brightness profiles in the 18-26 GHz frequency range with INAF radio telescopes II. Evidence for coronal emission
Study of solar brightness profiles in the 18-26 GHz frequency range with INAF radio telescopes II. Evidence for coronal emission Open
One of the most important objectives of solar physics is the physical understanding of the solar atmosphere, the structure of which is also described in terms of the density (N) and temperature (T) distributions of the atmospheric matter. …
View article: Analysis of the first coronagraphic multi-band observations of a sungrazing comet
Analysis of the first coronagraphic multi-band observations of a sungrazing comet Open
Context. Between 24 and 25 December 2021 a sungrazing comet (SOHO-4341) approached the Sun, being observed by “classical” visible light (VL) coronagraphs on board the SOHO and STEREO missions, and also by the innovative Metis coronagraph o…
View article: Experimental atomic data of spectral lines – I. Cs, Ba, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Re, and Os in the 370–1000 nm interval
Experimental atomic data of spectral lines – I. Cs, Ba, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Re, and Os in the 370–1000 nm interval Open
Atomic data are fundamental for plasma diagnostics in laboratory and astrophysics through spectroscopy. These data are extensively present in data bases for light elements, however incomplete for high-mass atoms. This paper presents the re…
View article: Coronal Heating Rate in the Slow Solar Wind
Coronal Heating Rate in the Slow Solar Wind Open
This Letter reports the first observational estimate of the heating rate in the slowly expanding solar corona. The analysis exploits the simultaneous remote and local observations of the same coronal plasma volume, with the Solar Orbiter/M…
View article: Coronal Heating Rate in the Slow Solar Wind
Coronal Heating Rate in the Slow Solar Wind Open
This Letter reports the first observational estimate of the heating rate in the slowly expanding solar corona. The analysis exploits the simultaneous remote and local observations of the same coronal plasma volume with the Solar Orbiter/Me…
View article: In-flight radiometric calibration of the Metis Visible Light channel using stars and comparison with STEREO-A/COR2 data
In-flight radiometric calibration of the Metis Visible Light channel using stars and comparison with STEREO-A/COR2 data Open
Context. We present the results for the in-flight radiometric calibration performed for the Visible Light (VL) channel of the Metis coronagraph on board Solar Orbiter. Aims. The radiometric calibration is a fundamental step in building the…
View article: Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya
Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya Open
The pulsating eclipsing binaries are remarkable systems that provide an opportunity to probe the stellar interior and to determine the fundamental stellar parameters precisely. Especially the detached eclipsing binary systems with (a) puls…
View article: Polarised line shape calculations for conditions encountered in stellar magnetic atmospheres
Polarised line shape calculations for conditions encountered in stellar magnetic atmospheres Open
We present new investigations into spectral line shapes under conditions typical for magnetic stellar atmospheres. Our method for simulating line profiles takes into account the coupled Zeeman and Stark effects. The calculations presented …
View article: New, late-type spectroscopic binaries with X-ray emission
New, late-type spectroscopic binaries with X-ray emission Open
In this paper, we present a spectroscopic study of six double-lined binaries, five of which were recently discovered in a high-resolution spectroscopic survey of optical counterparts of stellar X-ray sources. Thanks to high-resolution spec…
View article: Direct Observation of the Radial Magnetic Field Gradient in HD 58260 from Spectropolarimetry of NLTE Lines in Emission
Direct Observation of the Radial Magnetic Field Gradient in HD 58260 from Spectropolarimetry of NLTE Lines in Emission Open
Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric…
View article: Direct observation of the radial magnetic field gradient in HD58260 from spectropolarimetry of NLTE lines in emission
Direct observation of the radial magnetic field gradient in HD58260 from spectropolarimetry of NLTE lines in emission Open
Because of the unquestionable presence of magnetic fields in stars, their role in the structure of stellar atmospheres has for a long time been a subject of speculation. In our contribution to this discussion we present spectropolarimetric…
View article: Stellar Population Astrophysics (SPA) with the TNG
Stellar Population Astrophysics (SPA) with the TNG Open
Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself, we performed high-resolution spectroscopy in the framework of the S…
View article: Stellar Population Astrophysics (SPA) with the TNG: Stock 2, a little-studied open cluster with an eMSTO
Stellar Population Astrophysics (SPA) with the TNG: Stock 2, a little-studied open cluster with an eMSTO Open
Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself we performed high-resolution spectroscopy in the framework of the St…
View article: Twenty-year monitoring of the surface magnetic field of peculiar stars
Twenty-year monitoring of the surface magnetic field of peculiar stars Open
Magnetic chemically peculiar stars of the main sequence can present rotational periods as long as many decades. Here we report the results of an observational campaign started in 2001 aimed to establish these very long periods from the var…
View article: A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets
A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets Open
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample of hot magnetic stars, ranging from early-B to early-A spectral type. Spanning a wide range of stellar parameters and wind properties, these star…
View article: Long-term photospheric instabilities and envelopes dynamics in the post-AGB binary system 89 Herculis
Long-term photospheric instabilities and envelopes dynamics in the post-AGB binary system 89 Herculis Open
We present a long-term optical spectroscopic study of the post-asymptotic giant branch (AGB) binary system 89 Herculis, with the aim to characterize the relationship between photospheric instabilities and dynamics in the close circumstella…
View article: The auroral radio emission of the magnetic B-type star ρ OphC
The auroral radio emission of the magnetic B-type star ρ OphC Open
The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6–16.7 GHz) ATCA measurements of the early-type magnetic star ρ OphC, which is a flat-spectrum non-thermal …
View article: The single-sided pulsator CO Camelopardalis
The single-sided pulsator CO Camelopardalis Open
CO Cam (TIC 160268882) is the second ‘single-sided pulsator’ to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am …
View article: Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A
Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A Open
We present new ATCA multiwavelength radio measurements (range 2.1–21.2 GHz) of the early-type magnetic star ρ Oph A, performed in 2019 March during three different observing sessions. These new ATCA observations evidence a clear rotational…
View article: Erratum: HD 226766: a hierarchical SB3 system with two twin Am stars
Erratum: HD 226766: a hierarchical SB3 system with two twin Am stars Open
This is an erratum to the paper 'HD 226766: a hierarchical SB3 system with two twin Am stars' that was published in MNRAS, 487, 919-927 (2019).In the original version of this article, an error occurred in the presentation of Fig. 2.This ha…
View article: The solar-like ‘Second Spectrum’ and polarized metal lines in the emission of the post-AGB binary 89 Herculis
The solar-like ‘Second Spectrum’ and polarized metal lines in the emission of the post-AGB binary 89 Herculis Open
We studied the polarized spectrum of the post-AGB binary system 89 Herculis on the basis of data collected with the high-resolution Catania Astrophysical Observatory Spectropolarimeter, HArps-North POlarimeter and Echelle SpectroPolarimetr…
View article: Determination of SB2 masses and age: introduction of the mass ratio in the Bayesian analysis
Determination of SB2 masses and age: introduction of the mass ratio in the Bayesian analysis Open
Stellar age assignment still represents a difficult task in Astrophysics. This unobservable fundamental parameter can be estimated only through indirect methods, as well as generally the mass. Bayesian analysis is a statistical approach la…
View article: The multi-line slope method for measuring the effective magnetic field of cool stars: an application to the solar-like cycle of ε Eri
The multi-line slope method for measuring the effective magnetic field of cool stars: an application to the solar-like cycle of ε Eri Open
A method for the determination of integrated longitudinal stellar fields from\nlow-resolution spectra is the so-called slope method, which is based on the\nregression of the Stokes V signal against the first derivative of Stokes I.\nHere w…