Search Publications
Investigation of faint galactic carbon stars from the First Byurakan Spectral Sky Survey. IV. GAIA DR2 data
Kostandyan, G. R.
The second Gaia data release (Gaia DR2) data are used to analyze and estimate some important parameters for 127 carbon (C) type stars (56 are late N - type Asymptotic Giant Branch (AGB) C stars, 71 are early type CH giants) detected on the First Byurakan Spectral Sky Survey (FBS) low-resolution (lr) spectral plates. Gaia DR2 G broad band magnitude…
Binary star detection in the open cluster King 1 field
Saleh, Parvej Reja; Hazarika, Debasish; Dar, Ajaz Ahmad +2 more
A rarely studied open cluster, King 1 is observed using the 1.3-m telescope equipped with a 2k × 4k CCD at Vainu Bappu Observatory, India. We analyze the photometric data obtained from CCD observations in both B and V bands. Out of 132 detected stars in the open cluster King 1 field, we have identified four stellar variables, and two among them ar…
On the Formation of Lyman β and the O I 1027 and 1028 Å Spectral Lines
Carlsson, Mats; Shimizu, Toshifumi; Hasegawa, Takahiro +1 more
We study the potential of Lyman β and the O I 1027 and 1028 Å spectral lines to help in understanding the properties of the chromosphere and transition region (TR). The oxygen transitions are located in the wing of Lyman β, which is a candidate spectral line for the solar missions Solar Orbiter/Spectral Imaging of the Coronal Environment and Solar…
Simultaneous Polar and Cluster Observations in the Northern and Southern Middle-Altitude Polar Cusps Around Equinox
Berchem, J.; Escoubet, C. P.; Pitout, F. +3 more
We present an event of simultaneous observations of the northern and southern middle-altitude polar cusps by the Polar spacecraft and Cluster fleet that occurred on 23 September 2004. We examine the possible asymmetries in the fields and plasma parameters, although the proximity of the equinox should limit these asymmetries. Ion sensors reveal two…
Development of a simulator of the SIMBIOSYS suite onboard the BepiColombo mission
Cremonese, G.; Da Deppo, V.; Capaccioni, F. +11 more
BepiColombo is the fifth cornerstone mission of the European Space Agency (ESA) dedicated to study the Mercury planet. The BepiColombo spacecraft comprises two science modules: the Mercury Planetary Orbiter (MPO) realized by ESA and the Mercury Magnetospheric Orbiter provided by the Japan Aerospace Exploration Agency. The MPO is composed by 11 ins…
Electron Density Reconstruction of Solar Coronal Mass Ejections Based on a Genetic Algorithm: Method and Application
Inhester, Bernd; Wang, Huaning; Dai, Xinghua
We present a new method to reconstruct the three-dimensional electron density of coronal mass ejections (CMEs) based on a genetic algorithm, namely the genetic reconstruction method (GRM). GRM is first applied to model CMEs with different orientations and shapes. A set of analytic model CMEs from Gibson and Low is employed to produce synthetic CME…
The importance of studying active giant stars in eclipsing binaries - and the role of citizen scientists in finding them
Derekas, A.; Vanderburg, A.; Rappaport, S. +2 more
Red giant stars with deep convection zones and rapid rotation maintain a strong surface magnetic field which may alter their observable astrophysical parameters. The resulting lower surface temperature due to spots makes the inferred masses and ages from evolutionary tracks uncertain. Eclipsing binaries having an active giant component can help in…
Ammonia in circumstellar environment of V Cyg
Szczerba, R.; Etmański, B.; Schmidt, M. R.
The HIFI instrument on board of the Herschel Space Observatory (HSO) has been very successful in detecting molecular lines from the circumstellar envelopes around evolved stars, like massive red supergiants, Asymptotic Giant Branch (AGB) and post-AGB stars, as well as the planetary nebulae. Among others, ammonia have been found in the circumstella…
Multifrequency study of HH 137 and HH 138: discovering new knots and molecular outflows with Gemini and APEX
Rubio, Mónica; Saldaño, Hugo P.; Gómez, Mercedes +3 more
We present a multiwavelength study of two Herbig-Haro (HH) objects (137 and 138) that may be associated. We use Gemini H2 (2.12 µm) and K (2.2 µm) images, as well as Atacama Pathfinder EXperiment molecular line observations and Spitzer image archives. Several H2 knots, linked to the optical chain of knots of HH 13…
Comparison of Magnetic and Plasma Overshoots of Interplanetary Shocks
Yermolaev, Yu. I.; Eselevich, V. G.; Zastenker, G. N. +2 more
The structure of interplanetary shock fronts was studied based on the data from the BMSW plasma spectrometer, installed on the SPEKTR-R spacecraft, supplemented by magnetic field measurements on the WIND spacecraft. Special attention was paid to periodic growths (overshoots) in the value of the ion flux or magnetic field relative to their mean val…