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Bright spectroscopic binaries: II. A study of five systems with orbital periods of P≲500 days
Jack, Dennis; Schröder, Klaus-Peter; Hernández Huerta, Missael Alejandro +1 more
We present a detailed analysis of five bright spectroscopic binary systems (HD 18665, HD 27131, HD 171852, HD 215550, and HD 217427) that have orbital periods of P≲500 days. We determined the complete set of orbital parameters using the toolkit RadVel by analyzing the observed radial velocity curves. To study the properties of the five systems, we…
The Curious Case of the "Heartworm" Nebula
Heywood, I.; Camilo, F.; Predehl, P. +9 more
The curious Galactic features near G357.2-0.2 were observed with the MeerKAT radio interferometer array in the UHF and L bands (0.56-1.68 GHz). There are two possibly related features: a newly identified faint heart-shaped partial shell (the "heart"), and a series of previously known but now much better imaged narrow, curved features (the "worm") …
Link between the Optical and Radio Frames from Gaia DR3 Data and VLBI Measurements
Bobylev, V. V.
Based on published data, we have assembled a sample of 126 radio stars with the trigonometric parallaxes and proper motions measured by VLBI and available in the Gaia DR3 catalogue (in fact, Gaia EDR3). Our analysis of the Gaia-VLBI proper motion differences for 84 radio stars based on the model of solid-body mutual rotation has revealed no rotati…
Dust Mass Associated with the Supernova Remnant IC 443 When Emission Meets Extinction
Jiang, Biwei; Zhao, He; Li, Jun
The dust mass of the well-known supernova remnant IC 443 is estimated from both the infrared emission and the visual extinction. With photometry to the images taken by Spitzer, WISE, IRAS, AKARI, and Planck, the spectral energy distribution (SED) of the dust is obtained after subtracting synchrotron radiation and considering the spectral line emis…
Dynamical Origin for the Collinder 132-Gulliver 21 Stream: A Mixture of Three Comoving Populations with an Age Difference of 250 Myr
Tang, Shih-Yun; Pang, Xiaoying; Wang, Long +6 more
We use Gaia DR3 data to study the Collinder 132-Gulliver 21 region via the machine-learning algorithm STARGO and find eight subgroups of stars (ASCC 32, Collinder 132 gp 1-6, Gulliver 21) located in close proximity. Three comoving populations were identified among these eight subgroups: (i) a coeval 25 Myr old moving group (Collinder 132), (ii) an…
Water-maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream
Zhang, Bo; Li, Jingjing; Wu, Yuanwei +1 more
A 22 GHz water-maser survey was conducted towards 178 O-rich asymptotic giant branch (AGB) stars with the aim of identifying maser emission associated with the Sagittarius stellar stream. In this survey, maser emissions were detected in 21 targets, 20 of which were new detections. We studied the Galactic distributions of H2O- and SiO-ma…
Type IV Radio Bursts and Associated Active Regions in Sunspot Cycle 24
Kumari, Anshu
We study the association of solar Type IV radio bursts with the location of active regions on the Sun during Solar Cycle 24. The active regions associated with moving and stationary Type IV bursts are categorized as close to disk center and far from disk center, based on their location on the solar surface (i.e. ≤45∘ or ≥45∘,…
LAMOST J045019.27 + 394758.7, with peculiar abundances of N, Na, V, Zn, is possibly a Sculptor dwarf galaxy escapee
Shejeelammal, J.; Goswami, Aruna; Joshi, Santosh +5 more
We present the results of the high-resolution (R ~ 60 000) spectroscopic analysis of the star LAMOSTJ045019.27 + 394758.7 (hereafter J045) from the list of carbon stars of LAMOST DR2. From our analysis, we find that J045 does not exhibit the spectral characteristics of carbon stars. It is found to be a metal-poor ([Fe/H] = -1.05) giant that shows …
Linear Theory of Electromagnetic Ion Beam Instabilities in the Earth's Forshock: Peter Gary's Contributions (1981–1991)
Wilson, Lynn B., III; Winske, Dan
We discuss Peter Gary's contributions to the understanding of the origin and properties of ultra-low frequency (ULF) waves in the Earth's foreshock during the period when the International Sun Earth Explorer spacecraft (ISEE-1 and -2) provided unique data about the plasma and wave environment in this region. Peter's work concerning the linear theo…
XMM-Newton observations of PSR J0554+3107: pulsing thermal emission from a cooling high-mass neutron star
Karpova, A. V.; Zyuzin, D. A.; Potekhin, A. Y. +2 more
XMM-Newton observations of the middle-aged radio-quiet γ-ray pulsar J0554+3107 allowed us, for the first time, firmly identify it in X-rays by detection of pulsations with the pulsar period. In the 0.2-2 keV band, the pulse profile shows two peaks separated by about a half of the rotation phase with the pulsed fraction of 25 ± 6 per cent. The prof…