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The Slow Orbital Evolution of the Accreting Millisecond Pulsar IGR J0029+5934
Patruno, Alessandro
The accreting millisecond pulsars IGR J00291+5934 and SAX J1808.4-3658 are two compact binaries with very similar orbital parameters. The latter has been observed to evolve on a very short timescale of ∼70 Myr, which is more than an order of magnitude shorter than expected. There is an ongoing debate on the possibility that the pulsar spin-down po…
An analysis of star formation with Herschel in the Hi-GAL Survey. II. The tips of the Galactic bar
Paladini, R.; Piacentini, F.; Moore, T. J. T. +20 more
Context. We present the physical and evolutionary properties of prestellar and protostellar clumps in the Herschel Infrared GALactic plane survey (Hi-GAL) in two large areas centered in the Galactic plane and covering the tips of the long Galactic bar at the intersection with the spiral arms. The areas fall in the longitude ranges 19° <ℓ < 3…
Highly dynamically evolved intermediate-age open clusters
Piatti, Andrés E.; Dias, Wilton S.; Sampedro, Laura M.
We present a comprehensive UBVRI and Washington CT1T2 photometric analysis of seven catalogued open clusters, namely: Ruprecht 3, 9, 37, 74, 150, ESO 324-15 and 436-2. The multiband photometric data sets in combination with 2MASS photometry and Gaia astrometry for the brighter stars were used to estimate their structural para…
A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477
Tokuda, Kazuki; Tachihara, Kengo; Kaneda, Hidehiro +9 more
Massive molecular outflows erupting from high-mass young stellar objects (YSOs) provide important clues to understanding the mechanism of high-mass star formation. Based on new CO J = 3-2 and J = 1-0 observations using the Atacama Submillimeter Telescope Experiment (ASTE) and Mopra telescope facilities, we discovered a massive bipolar outflow asso…
High-resolution Spectroscopy and Spectropolarimetry of Selected δ-Sct Pulsating Variables
Joshi, Y. C.; Joshi, Santosh; Singh, Harinder P. +5 more
The combination of photometry, spectroscopy and spectropolarimetry of the chemically peculiar stars often aims to study the complex physical phenomena such as stellar pulsation, chemical inhomogeneity, magnetic field and their interplay with stellar atmosphere and circumstellar environment. The prime objective of this study is to determine the atm…
A Near-infrared Counterpart of 2E1613.5-5053: The Central Source in Supernova Remnant RCW103
Scholz, P.; Kaspi, V. M.; Tendulkar, S. P. +1 more
On 2016 June 22, 2E 1613.5-5053, the puzzling central compact object in supernova remnant RCW 103 emitted a magnetar-like burst. Using Director’s Discretionary Time, we observed 2E 1613.5-5053 with the Hubble Space Telescope (HST) (WFC3/IR) and we report here on the detection of a previously unseen infrared counterpart. In observations taken on 20…
Spectroscopic Evidence of Alfvén Wave Damping in the Off-limb Solar Corona
Gupta, G. R.
We investigate the off-limb active-region and quiet-Sun corona using spectroscopic data. The active region is clearly visible in several spectral lines formed in the temperature range of 1.1-2.8 MK. We derive the electron number density using the line ratio method, and the nonthermal velocity in the off-limb region up to the distance of 140 Mm. We…
Evidence of chaotic modes in the analysis of four δ Scuti stars
García, R. A.; García Hernández, A.; Roca Cortés, T. +1 more
Context. Since CoRoT observations unveiled the very low amplitude modes that form a flat plateau in the power spectrum structure of δ Scuti stars, the nature of this phenomenon, including the possibility of spurious signals due to the light curve analysis, has been a matter of long-standing scientific debate.
Aims: We contribute to this debat…
The onset of energetic particle irradiation in Class 0 protostars
Le Bourlot, J.; Favre, C.; Ceccarelli, C. +11 more
Context. The early stages of low-mass star formation are likely to be subject to intense ionization by protostellar energetic MeV particles. As a result, the surrounding gas is enriched in molecular ions, such as HCO+ and N2H+. Nonetheless, this phenomenon remains poorly understood for Class 0 objects. Recently, ba…
Imaging of diffuse H I absorption structure in the SSA22 protocluster region at z = 3.1
Ouchi, Masami; Inoue, Akio K.; Yamada, Toru +6 more
Using galaxies as background light sources to map intervening Ly α absorption is a novel approach to study the interplay among galaxies, the circumgalactic medium (CGM) and the intergalactic medium. Introducing a new measure of z = 3.1 H I Ly α absorption relative to the cosmic mean, ΔNB497, estimated from photometric data of star-forming galaxies…