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The variable V381 Lac and its possible connection with the R CrB phenomenon
Dell'Agli, F.; Nesci, R.; Rossi, C. +2 more
We have performed new medium resolution spectroscopy, optical and near-infrared photometry to monitor the variability of the asymptotic giant branch (AGB) carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the optical and near-infrared bands. Most notably we observed the change of Na …
Study of a bright-rimmed cloud at the border of the infrared dust bubble CN20
Rubio, M.; Ortega, M. E.; Giacani, E. +1 more
We characterize an uncatalogued bright-rimmed cloud located at the border of the infrared dust bubble CN20 with the aim of investigating triggered star formation. In order to do this, we carried out radio continuum observations at 8.9 GHz using the Jansky Very Large Array (JVLA) interferometer with a synthesized beam size of 13 arcsec × 5 arcsec, …
Analysis of horizontal flows in the solar granulation
Suematsu, Y.; Shimizu, T.; Quintero Noda, C.
Solar limb observations sometimes reveal the presence of a satellite lobe in the blue wing of the Stokes I profile from pixels belonging to granules. The presence of this satellite lobe has been associated in the past to strong line-of-sight gradients and, as the line-of-sight component is almost parallel to the solar surface, to horizontal granul…
Spectral mapping of V348 Puppis: spiral arms in the period gap
Saito, R. K.; Baptista, R.
We report the analysis of Hubble Space Telescope (HST) UV-optical spectroscopy of the nova-like variable V348 Puppis with eclipse mapping techniques. We measured the eclipse width at disc centre and determined a lower limit on the mass ratio of q > 0.3, with a tight relation between q and the binary inclination i. For 0.31 ≤ q ≤ 0.6, we have 79…
Discovery of hard phase lags in the pulsed emission of GRO J1744-28
Sanna, A.; Di Salvo, T.; Burderi, L. +4 more
We report on the discovery and energy dependence of hard phase lags in the 2.14 Hz pulsed profiles of GRO J1744-28. We used data from XMM-Newton and NuSTAR. We were able to well constrain the lag spectrum with respect to the softest (0.3-2.3 keV) band: the delay shows increasing lag values reaching a maximum delay of ∼12 ms, between 6 and 6.4 keV.…
Buoyancy-driven inflow to a relic cold core: the gas belt in radio galaxy 3C 386
Birkinshaw, M.; Worrall, D. M.; Kraft, R. P. +1 more
We report measurements from an XMM-Newton observation of the low-excitation radio galaxy 3C 386. The study focusses on an X-ray-emitting gas belt, which lies between and orthogonal to the radio lobes of 3C 386 and has a mean temperature of 0.94 ± 0.05 keV, cooler than the extended group atmosphere. The gas in the belt shows temperature structure w…
The complex high-mass star-forming region IRAS 15507-5359
Roth, M.; Elia, D.; Persi, P. +2 more
The far-infrared IRAS 15507-5359 source is known to be a medium-mass star-forming region associated with a compact H II region and a near-infrared embedded cluster. We present a survey of infrared-calibrated images ranging from 1.2 to 500 µm obtained with the Baade telescope at Las Campanas Observatory, and the Herschel space telescope with …
AGB stars in Leo P and their use as metallicity probes
Lee, Chien-Hsiu
Leo P is the most metal-poor yet star-forming galaxy in the local volume, and has the potential to serve as a local counterpart to interpret the properties of distant galaxies in the early universe. We present a comprehensive search of asymptotic giant branch (AGB) stars in Leo P using deep infrared imaging. AGB stars are the major dust contributo…
The nature of the cataclysmic variable PT Per
Watson, M. G.; Osborne, J. P.; Schwope, A. D. +2 more
We present a study of the cataclysmic variable star PT Per based on archival XMM-Newton X-ray data and new optical spectroscopy from the William Herschel Telescope (WHT) with Intermediate dispersion Spectrograph and Imaging System (ISIS). The X-ray data show deep minima which recur at a period of 82 min and a hard, unabsorbed X-ray spectrum. The o…
The bandmerged Planck Early Release Compact Source Catalogue: probing sub-structure in the molecular gas at high Galactic latitude
Helou, G.; McGehee, P.; Pearson, T. J. +3 more
The Planck Early Release Compact Source Catalogue (ERCSC) includes nine lists of highly reliable sources, individually extracted at each of the nine Planck frequency channels. To facilitate the study of the Planck sources, especially their spectral behaviour across the radio/infrared frequencies, we provide a `bandmerged' catalogue of the ERCSC so…