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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…
Constraining the abundance of dark matter in the central region of the galaxy cluster MACS J1206.2-0847 with a free-form strong lensing analysis
Lam, Daniel; Diego, Jose M.; Herranz, Diego +1 more
We performed a free-form strong lensing analysis of the galaxy cluster MACS J1206.2-0847 in order to estimate and constrain its inner dark matter distribution. The free-form method estimates the cluster total mass distribution without using any prior information about the underlying mass. We used 97 multiple lensed images belonging to 27 backgroun…
86-GHz SiO masers in Galactic centre OH/IR stars
Messineo, Maria; Omont, Alain; Sjouwerman, Lorant O. +1 more
We present results on a search for 86.243-GHz SiO (J = 2→1, $v$ = 1) maser emission toward 67 OH/IR stars located near the Galactic centre. We detected 32 spectral peaks, of which 28 correspond to SiO maser lines arising from the envelopes of these OH/IR stars. In OH/IR stars, we obtained an SiO maser detection rate of about $40\%$ . We serendipit…
Comparing the Features of Generation of CMEs Moving with Different Speed in the Field of View of the LASCO Coronagraphs
Fainshtein, V. G.; Zagainova, Yu. S.
This study is aimed at finding an answer to the following question: are there any fundamental differences in the generation of coronal mass ejections (CMEs) with different speeds, especially low and high speeds, detected in the field of view of LASCO coronagraphs? Fast CMEs are conventionally understood as mass ejections with a linear projection v…
Water in the Star-forming Region NGC 7129 FIRS 2
Conrad, Mollie E.; Fich, Michel
Observations of intermediate mass (IM) star formation are expected to highlight the transition between the formation processes of its low and high-mass (HM) counterparts. ${{\rm{H}}}_{2}^{18}{\rm{O}}$ and ${{\rm{H}}}_{2}^{16}{\rm{O}}$ observations of the IM star formation region NGC 7129 FIRS 2 were obtained with the Heterodyne Instrument for the …
Study of open cluster King 13 using CCD VI, 2MASS and Gaia DR2 Astrometry.
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +2 more
In this paper, we present astrophysical parameters of the open cluster King 13 based on the VI CCD and 2MASS JHKs photometric data. This is a poorly studied cluster, for which new results have been found in the present work. To identify probable members, we use proper motion data from Gaia DR2 catalogue. The mean proper motion of the cl…
Size of the smallest particles in Saturn's rings
Kimura, Hiroshi; Ohtsuki, Keiji; Hirata, Naoyuki +2 more
Spacecraft and ground-based observations have shown that particles in Saturn's main rings have a power-law distribution roughly between centimeter and ten meters, but sub-centimeter particles appear to be lacking. Recent studies based on Cassini observations suggest that the minimum particle size is on the order of millimeters, although their abun…