Search Publications
A MUSE view of the asymmetric jet from HD 163296
Snellen, I. A. G.; Girard, J.; Brinchmann, J. +5 more
Context. Jets and outflows are thought to play important roles in regulating star formation and disk evolution. An important question is how the jets are launched. HD 163296 is a well-studied Herbig Ae star that hosts proto-planet candidates, a protoplanetary disk, a protostellar jet, and a molecular outflow, which makes it an excellent laboratory…
The Quasi-biennial-oscillation-type Signals in the Subsurface Flow Fields during Solar Cycles 23 and 24
Howe, Rachel; Inceoglu, Fadil; Loto'aniu, Paul T. M.
We studied the presence and spatiotemporal evolution of quasi-biennial oscillations (QBOs) in the rotation-rate residuals at target depths of 0.90R⊙, 0.95R⊙, and 0.99R⊙ and at low- (0°-30°), mid- (30°-50°), and high-latitudinal (50°-70°) bands. To achieve these objectives we used data from the Michelson Doppler Ima…
New Herbig-Haro objects and outflows in the Mon R1 association
Movsessian, T. A.; Magakian, T. Yu; Dodonov, S. N.
We present the results of a narrow-band Hα and [S II] imaging survey of the Mon R1 association performed with the 1-m Schmidt telescope at Byurakan Observatory. Our observations covered a 1° field near the centre of the association. As a result of this study, 20 new Herbig-Haro knots were discovered, some of which form collimated outflows. Among t…
ALMA-IRDC - II. First high-angular resolution measurements of the 14N/15N ratio in a large sample of infrared-dark cloud cores
Caselli, P.; Pineda, J. E.; Jiménez-Serra, I. +6 more
The 14N/15N ratio in molecules exhibits a large variation in star-forming regions, especially when measured from N2H+ isotopologues. However, there are only a few studies performed at high-angular resolution. We present the first interferometric survey of the 14N/15N ratio in N…
Dynamical Evolution of an Active-region Filament Driven by Magnetic Reconnection
Hou, Yijun; Li, Ting; Zhang, Jun +1 more
Studying solar filament dynamical evolutions is an important approach to reveal the driving mechanism of solar eruptions, which seriously impact on the Sun-Earth system and could cause disastrous space weather. To better understand the evolution process of solar filaments, here we investigate an active-region filament by employing observations fro…
SN 2013ai: A Link between Hydrogen-rich and Hydrogen-poor Core-collapse Supernovae
Lyman, J. D.; Kirshner, R. P.; Suntzeff, N. B. +33 more
We present a study of the optical and near-infrared (NIR) spectra of SN 2013ai along with its light curves. These data range from discovery until 380 days after explosion. SN 2013ai is a fast declining Type II supernova (SN II) with an unusually long rise time, 18.9 ± 2.7 days in the V-band, and a bright V-band peak absolute magnitude of -18.7 ± 0…
Blast from the past: constraining progenitor models of SN 1972E
Schweizer, François; Shappee, Benjamin J.; Tonry, John L. +7 more
We present a novel technique to study Type Ia supernovae (SNe Ia) by constraining surviving companions of historical extragalactic SN by combining archival photographic plates and Hubble Space Telescope(HST) imaging. We demonstrate this technique for Supernova 1972E, the nearest known SN Ia in 125 yr. Some models of SNe Ia describe a white dwarf w…
Gaia DR2 giants in the Galactic dust - II. Application of the reddening maps and models
Gontcharov, George A.; Mosenkov, Aleksandr V.
We exploit a complete sample of 101 810 Gaia DR2 giants, selected in Paper I in the space cylinder with a radius of 700 pc around the Sun and a height of |Z| = 1800 pc, using the Gaia DR2 parallaxes, GBP and GRP photometry, and WISE W3 photometry. We explain the spatial variations of the modes of the observables GBP
Asteroseismology of RRab variable star EZ Cnc from K2 photometry and LAMOST spectroscopy
Zong, Weikai; Fu, Jian-Ning; Wang, Jiaxin +2 more
EZ Cnc, or EPIC 212182292, is a non-Blažko RRab variable star located in the field of K2 Campaign 16. Its atmospheric parameters (Teff, log g, [M/H]) and radial velocities are measured from the 55 high-quality LAMOST medium-resolution spectra. The fundamental frequency of pulsation is derived as f = 1.8323(17) d-1 from the K2…
Magnetic Reconnection Within the Boundary Layer of a Magnetic Cloud in the Solar Wind
Nakamura, Rumi; Narita, Yasuhito; Vörös, Zoltán. +5 more
The twisted local magnetic field at the front or rear regions of the magnetic clouds (MCs) associated with interplanetary coronal mass ejections (ICMEs) is often nearly opposite to the direction of the ambient interplanetary magnetic field. There is also observational evidence for magnetic reconnection (MR) outflows occurring within the boundary l…