Science Archives Publication System

Heliospheric Magnetic Field and The Parker Model

DOI: 10.1134/S0016793221030154 Bibcode: 2021Ge&Ae..61..299S

Bazilevskaya, G. A.; Svirzhevsky, N. S.; Kalinin, M. S. +4 more

In the Parker model of the heliospheric magnetic field, the ratio of the azimuthal field component $${{B}_{{{\varphi }}}}$$ to the radial component $${{B}_{r}}$$ depends only on the radial spee…

2021 • Geomagnetism and Aeronomy

Ulysses 2

The frequency by mass of Galactic carbon stars inferred from Gaia measurements of star cluster members

DOI: 10.1093/mnras/stab1967 Bibcode: 2021MNRAS.506.3669P

Worthey, G.; Pal, Tathagata

We investigate the frequency of occurrence of Galactic carbon stars as a function of progenitor mass using Gaia data. Small number statistics limit fidelity, but C-star frequency agrees with that observed in the Magellanic Clouds (MCs) down to m ≈ 1.67 M_⊙. At m ≈ 1.38 M_⊙, the frequency rises by a factor of three even though t…

2021 • Monthly Notices of the Royal Astronomical Society

Gaia 2

Mass Ratios of Long-Period Binary Stars Resolved in Precision Astrometry Catalogs of Two Epochs

DOI: 10.22201/ia.01851101p.2021.57.02.12 Bibcode: 2021RMxAA..57..399M

Makarov, V. V.

Mass ratios of widely separated, long-period, resolved binary stars can be directly estimated from the available data in major space astrometry catalogs, such as the ESA's Hipparcos and Gaia mission results. The method is based on the universal principle of inertial motion of the system's center of mass in the absence of external forces, and is in…

2021 • Revista Mexicana de Astronomia y Astrofisica

Gaia Hipparcos 2

Interstellar Extinction and Polarization of Stars in the Open Cluster NGC 7160

DOI: 10.1088/1538-3873/ac27fa Bibcode: 2021PASP..133j4301T

Topasna, G. A.; Riley, R. W.; Kaltcheva, N. T.

We present polarimetric observations of stars in the field of the open cluster NGC 7160. The multi-wavelength UBVRI polarization measurements of 21 stars that we performed indicate that some of the observed stars follow the typical wavelength dependence indicative of polarization by selective extinction in the interstellar medium, while others dis…

2021 • Publications of the Astronomical Society of the Pacific

Gaia 2

Characterizing southern portion of Mare Vaporum with improved Chandrayaan-1 M³ data

DOI: 10.1016/j.icarus.2020.114123 Bibcode: 2021Icar..35514123S

Videen, Gorden; Shkuratov, Yuriy; Surkov, Yehor +3 more

We investigate a southern portion of Mare Vaporum using Chandrayaan-1 M³ images for which we suppress striped noise. Additional data processing allows us to analyze such spectral parameters as the depths and positions of the absorption bands near 1 and 2 µm. Mineral types were mapped using the cluster analysis of Adams diagram for…

2021 • Icarus

Chandrayaan-1 2

The disk-torus system in active galactic nuclei: possible evidence of highly spinning black holes

DOI: 10.1051/0004-6361/202141602 Bibcode: 2021A&A...656A..96C

Celotti, Annalisa; Ghisellini, Gabriele; Sbarrato, Tullia +1 more

We study the ratio R between the luminosity of the torus and that of the accretion disk, inferred from the relativistic model KERRBB for a sample of approximately 2000 luminosity-selected radio-quiet Type I active galactic nuclei from the Sloan Digital Sky Survey catalog. We find a mean ratio R ≈ 0.8 and a considerable number of sources with R ≳ 1…

2021 • Astronomy and Astrophysics

IUE eHST 2

Measuring Young Stars in Space and Time. I. The Photometric Catalog and Extinction Properties of N44

DOI: 10.3847/1538-3881/abee8b Bibcode: 2021AJ....161..256K

Gennaro, Mario; Dolphin, Andrew E.; Klessen, Ralf S. +9 more

In order to better understand the role of high-mass stellar feedback in regulating star formation in giant molecular clouds, we carried out a Hubble Space Telescope (HST) Treasury Program Measuring Young Stars in Space and Time (MYSST) targeting the star-forming complex N44 in the Large Magellanic Cloud (LMC). Using the F555W and F814W broadband f…

2021 • The Astronomical Journal

Gaia eHST 2

τ⁹ Eri: a bright pulsating magnetic Bp star in a 5.95-d double-lined spectroscopic binary

DOI: 10.1093/mnras/stab338 Bibcode: 2021MNRAS.502.5200W

Wade, G. A.; Pigulski, A.; Kochukhov, O. +2 more

τ⁹ Eri is a Bp star that was previously reported to be a single-lined spectroscopic binary. Using 17 ESPaDOnS spectropolarimetric (Stokes V) observations, we identified the weak spectral lines of the secondary component and detected a strong magnetic field in the primary. We performed orbital analysis of the radial velocities of both co…

2021 • Monthly Notices of the Royal Astronomical Society

Gaia Hipparcos 2

The Araucaria Project: Deep Near-infrared Photometric Maps of Local and Sculptor Group Galaxies. I. Carina, Fornax, and Sculptor

DOI: 10.3847/1538-4365/abdf60 Bibcode: 2021ApJS..253...42K

Gieren, Wolfgang; Pietrzyński, Grzegorz; Pilecki, Bogumił +12 more

Deep near-infrared (NIR) J- and K-band photometry of three Local Group dwarf spheroidal galaxies—Fornax, Carina, and Sculptor—is made available for the community. Until now, these data have only been used by the Araucaria Project to determine distances using the tip of the red giant branch and RR Lyrae stars. Now, we present the entire data collec…

2021 • The Astrophysical Journal Supplement Series

Gaia 2

XMM Observation of the Supernova Remnant J0454-6713 and the Adjacent N9 Superbubble

DOI: 10.3847/1538-4357/abd561 Bibcode: 2021ApJ...909...13S

Foster, Adam R.; Smith, Randall K.; Points, Sean D. +1 more

The Large Magellanic Cloud supernova remnant J0454-6713 abutting the H II region N9 has been observed with XMM-Newton. Two groups of lines from Fe XVII account for half the emission and lines from Fe XVIII, O VII, and O VIII are also clearly detected with the XMM RGS. Isothermal equilibrium fits of the EPIC spectra reproduce the basic spectral for…

2021 • The Astrophysical Journal

XMM-Newton 2