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Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm
De, Kishalay; Kasliwal, Mansi M.; Hillenbrand, Lynne A. +9 more
We report the discovery of a likely outbursting Class I young stellar object, associated with the star-forming region NGC 281-W (distance ∼2.8 kpc). The source is currently seen only at infrared wavelengths, appearing in both the Palomar Gattini InfraRed (1.2 µm) and the Near-Earth Object Wide-field Infrared Survey Explorer (3.4 and 4.6 &mic…
Blow-away in the Extreme Low-mass Starburst Galaxy Pox 186
Scarlata, Claudia; Jaskot, Anne; Skillman, Evan +1 more
Pox 186 is an exceptionally small dwarf starburst galaxy hosting a stellar mass of ∼105 M⊙. Undetected in H I (M < 106 M⊙) from deep 21 cm observations and with an [O III]/[O II] (5007/3727) ratio of 18.3 ± 0.11, Pox 186 is a promising candidate Lyman continuum emitter. It may be a possible analog of …
Metal-poor stars observed with the automated planet finder telescope. III. CEMP-no stars are the descendant of population III stars
Zhao, Gang; Mardini, Mohammad K.; Al-Wardat, Mashhoor A. +4 more
This study reports a probabilistic insight into the stellar-mass and supernovae (SNe) explosion energy of five CEMP-no stars' possible progenitors. As such, a direct comparison between the abundance ratios [X/Fe] of the light-elements and the predicted nucleosynthetic yields of SN of high-mass metal-free stars has been performed. This comparison s…
Early science with the Large Millimeter Telescope: a 1.1 mm AzTEC survey of red-Herschel dusty star-forming galaxies
Ivison, R. J.; Omont, A.; Pope, A. +32 more
We present Large Millimeter Telescope (LMT)/AzTEC 1.1 mm observations of ~100 luminous high-redshift dusty star-forming galaxy candidates from the $\sim 600\,$ sq.deg Herschel-ATLAS survey, selected on the basis of their SPIRE red far-infrared colours and with $S_{500\, \mu \rm m}=35-80$ mJy. With an effective $\theta _{\rm FWHM}\approx 9.5\,$arcs…
Raman mapping of photodissociation regions
Henney, William J.
Broad Raman-scattered wings of hydrogen lines can be used to map neutral gas illuminated by high-mass stars in star-forming regions. Raman scattering transforms far-ultraviolet starlight from the wings of the Lyβ line (1022-1029 Å) to red visual light in the wings of the Hα line (6400 -6700 Å). Analysis of spatially resolved spectra of the Orion B…
Nigraha: Machine-learning-based pipeline to identify and evaluate planet candidates from TESS
Mahabal, Ashish; Rao, Sriram; Rao, Niyanth +1 more
The Transiting Exoplanet Survey Satellite (TESS) has now been operational for a little over two years, covering the Northern and the Southern hemispheres once. The TESS team processes the downlinked data using the Science Processing Operations Center (SPOC) pipeline and Quick Look pipeline (QLP) to generate alerts for follow-up. Combined with othe…
Astrometric and Photometric Investigation of Three Old Age Open Clusters in the Gaia Era: Berkeley 32, Berkeley 98, and King 23
Bisht, D.; Yadav, R. K. S.; Rangwal, G. +2 more
Using the photometric and kinematical data from Gaia Data Release 2, three old open clusters namely Berkeley 32 (Be 32), Berkeley 98 (Be 98), and King 23 are investigated. The latter two of these clusters are poorly studied in the literature. The numbers of the most probable cluster members are 563, 260, and 114 for Be 32, Be 98, and King 23, resp…
Six Outbursts of Comet 46P/Wirtanen
Duev, Dmitry A.; Southworth, J.; Bellm, Eric C. +33 more
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles. In order to fully understand nuclear surfaces and their evolution, we must identify the causes of cometary outbursts. In that context, we present a s…
Searching for multiple populations in Ruprecht 106
Villanova, S.; Fernández-Trincado, J. G.; Muñoz, C. +1 more
More than a decade has passed since the definition of globular cluster (GC) changed, and now we know that they host multiple populations (MPs). But few GCs do not share that behaviour and Ruprecht 106 is one of these clusters. We analysed 13 member red giant branch stars using spectra in the wavelength range 6120-6405 Å obtained through the GIRAFF…
A case study of ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Faltová, N. +6 more
Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of the interplay of atomic diffusion, magnetic fields, and stellar rotation. A non-uniform surface distribution of chemical elements and the non-alignment of the rotational and magnetic axes result in the variability of several observables. P…