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CCD astrometric measurements for the dwarf planet Haumea by ground-based telescopes
Vienne, A.; Peng, Q. Y.; Zheng, Z. J. +3 more
Aims: The purpose of this work is to investigate an astrometric method to accurately measure the precise position of the center of mass of the dwarf planet Haumea and its satellites, based on the unresolved images taken by ground-based telescopes.
Methods: A total of 29 nights of CCD observations are reported of the dwarf planet Haumea, …
Polarisation of molecular lines in the circumstellar envelope of the post-asymptotic giant branch star OH 17.7-2.0
Tafoya, D.; Vlemmings, W. H. T.
Context. The role of magnetic field in shaping planetary nebulae (PNe), either directly or indirectly after being enhanced by binary interaction, has long been a topic of debate. Large-scale magnetic fields around pre-PNe have been inferred from polarisation observations of masers. However, because masers probe very specific regions, it is still u…
The Study of Helium Variations in Star Clusters Using China Space Station Telescope
Deng, Licai; Li, Chengyuan; Ji, Xin +2 more
The China Space Station Telescope (CSST) is a 2 m space-based optical-UV telescope. Its primary goal is to carry out a high-resolution photometric imaging survey of a 17,500 square degree sky area using the on board Survey Camera. With its wide field of view (1.1 square degrees) and a mosaic imager containing 640 million pixels, studying the diffe…
Twisted magnetic field in star formation processes of L1521 F revealed by submillimeter dual-band polarimetry using the James Clerk Maxwell Telescope
Shinnaga, Hiroko; Tomisaka, Kohji; Harada, Naoto +3 more
Understanding the initial conditions of star formation requires both observational studies and theoretical works taking into account the magnetic field, which plays an important role in star formation processes. Herein, we study the young nearby dense cloud core L1521 F [n(H2) ~104-6 cm-3] in the Taurus Molecular C…
Physical properties of circumnuclear ionizing clusters - I. NGC 7742
Zamora, S.; Díaz, Ángeles I.
This work aims to derive the physical properties of the circumnuclear star-forming region in the ring of the face-on spiral NGC 7742 using integral field spectroscopy observations. We have selected 88 individual ionizing clusters that power H II regions populating the ring of the galaxy that may have originated in a minor-merger event. For the H I…
DMPP-3: confirmation of short-period S-type planet(s) in a compact eccentric binary star system, and warnings about long-period RV planet detections
Barstow, Joanna K.; Stevenson, Adam T.; Haswell, Carole A. +2 more
We present additional HARPS radial velocity observations of the highly eccentric (e ~ 0.6) binary system DMPP-3AB, which comprises a K0V primary and a low-mass companion at the hydrogen burning limit. The binary has a 507 d orbital period and a 1.2 au semimajor axis. The primary component harbours a known 2.2 M⊕ planet, DMPP-3A b, with …
A Broad-line Quasar with Unexplained Extreme Velocity Offsets: Post-shock Outflow?
Schramm, Malte; Mobasher, Bahram; Steinhardt, Charles L. +4 more
The quasar SDSS 0956 + 5128 exhibits three distinct velocity components with large offsets in emission: the systemic velocity of [O II], [O III], and [Ne III] narrow lines have redshift z = 0.7142; the broad Mg II line is shifted by -1200 km s-1 with respect to the narrow lines; the broad Hα and Hβ lines are at -4100 km s-1. …
Strong Variability in AzV 493, an Extreme Oe-type Star in the SMC
Oey, M. S.; Renzo, M.; Castro, N. +11 more
We present 18 yr of OGLE photometry together with spectra obtained over 12 yr revealing that the early Oe star AzV 493 shows strong photometric (ΔI < 1.2 mag) and spectroscopic variability with a dominant, 14.6 yr pattern and ~40 day oscillations. We estimate the stellar parameters T eff = 42,000 K, $\mathrm{log}L/{L}_{\odot }=5.83\p…
Gamma rays from nebulae around recurrent novae
Bednarek, W.; Sitarek, J.
Novae were discovered to emit transient γ rays during the period of several days to a few weeks after initial explosion, indicating presence of acceleration processes of particles in their expanding shells. In the case of recurrent novae, electrons can be in principle accelerated in the nova shells for the whole recurrence period of nova producing…
HD 32239: An Algol type eclipsing binary with a γ Doradus type component
Gürol, Birol
HD 32239 is an Algol-type eclipsing binary with one of the components showing γ Doradus type pulsation. In this study by using the Transiting Exoplanet Survey Satellite (TESS) observations of the HD 32239 system published in Sectors 5 and 32, we obtained the minima times of the eclipsing system and calculated the new light elements by using the (O…