527 citations · 1.6k across the 18 of their papers we have counts for
18 papers
Observations of UX Ori in deep minima with the Nordic Optical Telescope. I. Analysis of spectral lines
L. V. Tambovtseva, A. A. Djupvik, V. P. Grinin +11
UX Orionis stars are the most active young stars; they undergo sporadic fadings of 2 - 4 magnitudes in the V-band, due to variable circumstellar extinction caused by a nearly edge-…
Modelling UX Ori Star Eclipses based on Spectral Observations with the Nordic Optical Telescope. I. RR Tau
V. P. Grinin, L. V. Tambovtseva, A. A. Djupvik +12
Based on observations obtained with the Nordic Optical Telescope we investigate the spectral variability of the Herbig Ae star RR Tau. This star belongs to the UX Ori family, chara…
The Vanishing & Appearing Sources during a Century of Observations project: I. USNO objects missing in modern sky surveys and follow-up observations of a "missing star"
Beatriz Villarroel, Johan Soodla, Sébastien Comerón +19
In this paper we report the current status of a new research program. The primary goal of the "Vanishing & Appearing Sources during a Century of Observations" (VASCO) project is to…
AGN luminosity and stellar age -- two missing ingredients for AGN unification as seen with iPTF supernovae
Beatriz Villarroel, Anders Nyholm, Torgny Karlsson +4
Active Galactic Nuclei (AGN) are extremely powerful cosmic objects, driven by accretion of hot gas upon super-massive black holes. The zoo of AGN classes are divided into two major…
A Relic Star Cluster in the Sextans Dwarf Spheroidal Galaxy - Implications for Early Star and Galaxy Formation
Torgny Karlsson, Joss Bland-Hawthorn
We present tentative evidence for the existence of a dissolved star cluster in the Sextans dwarf spheroidal galaxy. In a sample of six stars, we identify three (possibly four) star…
The Chemical Signature of a Relic Star Cluster in the Sextans Dwarf Spheroidal Galaxy - Implications for Near-Field Cosmology
Torgny Karlsson, Joss Bland-Hawthorn, Ken Freeman +1
We present tentative evidence for the existence of a dissolved star cluster at [Fe/H]=-2.7 in the Sextans dwarf spheroidal galaxy. We use the technique of chemical tagging to ident…