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Disc light variability in the FUor star V646 Puppis as observed by TESS and from the ground
Ogłoza, Waldemar; Siwak, Michał; Krzesiński, Jerzy
Context. We investigate small-scale light variations in V646 Pup occurring on timescales of days, weeks, and years.
Aims: We aim to investigate whether this variability is similar to that observed in FU Ori.
Methods: We observed V646 Pup on six occasions at the SAAO and CTIO between 2013 and 2018 with Johnson and Sloan filters, typically…
Asymmetric distributions of H2O and SiO masers towards V627 Cas
Kim, Dong-Jin; Rioja, María J.; Dodson, Richard +7 more
We performed simultaneous observations of the $\rm H_2O$ 61,6 - 52,3 (22.235080 GHz) and SiO V = 1, 2, J = 1 → 0, SiO V = 1, J = 2 → 1, 3 → 2 (43.122080, 42.820587, 86.243442, and 129.363359 GHz) masers towards the suspected D-type symbiotic star, V627 Cas, using the Korean VLBI Network. Here, we present astrometrically regis…
Spectroscopic Monitoring of Rapidly Rotating Early-type Stars in the Pleiades Cluster
Torres, Guillermo
Radial velocities for the early-type stars in the Pleiades cluster have always been challenging to measure because of the significant rotational broadening of the spectral lines. The large scatter in published velocities has led to claims that many are spectroscopic binaries, and in several cases, preliminary orbital solutions have been proposed. …
Distortion of Magnetic Fields in the Dense Core CB81 (L1774, Pipe 42) in the Pipe Nebula
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +9 more
The detailed magnetic field structure of the starless dense core CB81 (L1774, Pipe 42) in the Pipe Nebula was determined based on near-infrared polarimetric observations of background stars to measure dichroically polarized light produced by magnetically aligned dust grains in the core. The magnetic fields pervading CB81 were mapped using 147 star…
"TNOs are Cool": A survey of the trans-Neptunian region. XV. Physical characteristics of 23 resonant trans-Neptunian and scattered disk objects
Pál, A.; Lellouch, E.; Marton, G. +7 more
The goal of this work is to determine the physical characteristics of resonant, detached and scattered disk objects in the trans-Neptunian region, observed mainly in the framework of the "TNOs are Cool" Herschel open time key programme. Based on thermal emission measurements with the Herschel/PACS and Spitzer/MIPS instruments, we determine size, a…
Lithium in T Coronae Borealis
Strassmeier, K. G.; Munari, U.; Evans, A. +5 more
T Coronae Borealis is a recurrent, symbiotic nova system currently in quiescence between its periodic ≈80 yr cycle of eruptions. Observations during inter-outburst epochs provide an opportunity to study properties of the accretion disk and the M red giant. Here we present new irradiated (blackbody veiling) models, incorporating modern molecular op…
High-resolution Optical Spectroscopic Observations of Comet 21P/Giacobini-Zinner in Its 2018 Apparition
Shinnaka, Yoshiharu; Kawakita, Hideyo; Tajitsu, Akito
Comet 21P/Giacobini-Zinner is a peculiar comet from the viewpoints of the chemical and physical properties of its dust grains. We conduct optical high-resolution spectroscopic observations of the comet. The intensity ratios of forbidden oxygen lines (at 557.7, 630.0, and 636.4 nm) and ortho-to-para abundance ratios (OPRs) of water cations (H2…
Broadband Linear Polarization in the Region of the Open Star Cluster NGC 1817
Pandey, Jeewan C.; Singh, Sadhana
Multiband linear polarimetric observations of 125 stars in the region of the cluster NGC 1817 have been carried out intending to study properties of interstellar dust and grains in that direction. The polarization is found to be wavelength-dependent, being maximum in the V band with an average value of 0.95%. The foreground interstellar dust grain…
Massive molecular gas reservoir around the central AGN in the CARLA J1103 + 3449 cluster at z = 1.44
Markov, Vladan; Noirot, Gaël; Gonzalez, Anthony H. +14 more
Passive early-type galaxies dominate cluster cores at z ≲ 1.5. At higher redshift, cluster core galaxies are observed to have on-going star-formation, which is fueled by cold molecular gas. We measured the molecular gas reservoir of the central region around the radio-loud active galactic nucleus (AGN) in the cluster CARLA J1103 + 3449 at z = 1.44…
Counterparts of Far Eastern Guest Stars: Novae, supernovae, or something else?
Hoffmann, Susanne M.; Vogt, Nikolaus
Historical observations of transients are crucial for studies of their long-term evolution. This paper forms part of a series of papers in which we develop methods for the analysis of ancient data of transient events and their usability in modern science. Prior research on this subject by other authors has focused on looking for historical superno…