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H α fluxes and extinction distances for planetary nebulae in the IPHAS survey of the northern galactic plane
Barlow, M. J.; Sabin, L.; Jones, D. +7 more
We report H α filter photometry for 197 Northern hemisphere planetary nebulae (PNe) obtained using imaging data from the IPHAS survey. H α+[N II] fluxes were measured for 46 confirmed or possible PNe discovered by the IPHAS survey and for 151 previously catalogued PNe that fell within the area of the northern Galactic Plane surveyed by IPHAS. Afte…
Compound Eruptions of Twin Flux Ropes in a Solar Active Region
Zhang, Liang; Chen, Yao; Feng, Shiwei +6 more
Compound eruptions represent that multiple closely spaced magnetic structures erupt consecutively within a short interval, and then lead to a single flare and a single coronal mass ejection (CME). However, it is still subtle for the links between multiple eruptions and the associated single flare or/and single CME. In this Letter, we report the co…
The first spectroscopically confirmed brown dwarfs in NGC 2264
Scholz, Aleks; Teixeira, Paula S.; Mužić, Koraljka +2 more
We present spectroscopic follow-up observations of 68 red, faint candidates from our multi-epoch, multiwavelength, previously published survey of NGC 2264. Using near-infrared spectra from VLT/KMOS, we measure spectral types and extinction for 32 young low-mass sources. We confirm 13 as brown dwarfs in NGC 2264, with spectral types between M6 and …
Fast synthetic spectral fitting for large stellar samples: a critical test with 25 bright stars of known rotation
Snellen, I.; Schröder, K. -P.; Mittag, M. +2 more
This work presents and tests a reliable, but nonetheless fast, method for determining the physical parameters of large stellar samples with moderate-resolution spectra, with extensive host star-exoplanet studies in mind. The proposed strategy complements spectral synthesis for obtaining spectroscopically sensitive parameters (i.e. effective temper…
First black hole mass estimation for the quadruple lensed system WGD2038-4008
Assef, R. J.; Godoy, N.; Mediavilla, E. +6 more
Context. The quadruple lensed system WGD2038-4008 (zs = 0.777 ± 0.001) has recently been discovered with the help of new techniques and observations. Black hole masses have been estimated for lensed quasars, but they have mostly been calculated for one broad emission line of one image. However, the images could be affected by microlensi…
The Investigation of Seven Kepler Contact Binaries in the Field of NGC 6819
Liu, L.; Li, X. -Z.
Using the Kepler Eclipsing Binary Catalog, we found seven EW-type eclipsing binaries within the tidal radius of the intermediate-aged open cluster NGC 6819 (about 40'). These seven EW eclipsing binaries are all confirmed to be contact binaries by light curve analysis with the 2015 version Wilson-Devinney program. Using the parameter characteristic…
Approximate analytical description of the high latitude extinction
Malkov, Oleg; Kovaleva, Dana; Nekrasov, Alexei +1 more
The distribution of visual interstellar extinction AV has been mapped in selected areas over the Northern sky, using available LAMOST DR5 and Gaia DR2/EDR3 data. AV was modelled as a barometric function of galactic latitude and distance. The function parameters were then approximated by spherical harmonics. The resulting anal…
Detection of photometric variability in the very low-mass binary VHS J1256-1257AB using TESS and Spitzer
Miles-Páez, P. A.
Aims: We investigate the photometric properties of the M7.5 equal-mass binary VHS J1256-1257AB, which, combined with the late-L dwarf VHS J1256-1257 b, forms one of the few young triple systems of ultra-cool dwarfs currently known.
Methods: We analyzed two-minute TESS and two-second Spitzer archival data with total durations of about 25 …
A Study about the Secular Evolution of the Hierarchical Three-body Problem Using the Numerical Integrator TIDES
Docobo, José A.; Campo, Pedro P.; Piccotti, Luca +1 more
The hierarchical three-body problem is one of the classical issues of celestial mechanics, but recently it has regained importance due to its applications to new scenarios, like compact objects and exoplanets. In this paper we realize a computational study of this problem using the TIDES software package, which is applied not only to a set of theo…
Detection of Coronal Mass Ejections Using Unsupervised Deep Clustering
Alshehhi, Rasha; Marpu, Prashanth R.
Coronal mass ejection (CME) is a highly energetic solar phenomenon. It has a significant impact on the space weather in the near-Earth environment. With the accumulation of CME observations, it becomes more challenging to handle them manually. Therefore, we need an automatic method for identifying CMEs. We propose an unsupervised method for classi…