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Is there a black hole in the center of the Sun?

Bellinger, Earl P.; Caplan, Matthew E.; Santarelli, Andrew D.

There is probably not a black hole in the center of the Sun. Despite this detail, our goal in this work to convince the reader that this question is interesting and that work studying stars with central black holes is well motivated. If primordial black holes exist then they may exist in sufficiently large numbers to explain the dark matter in the…

On the mass assembly history of the Milky Way: clues from its stellar halo

Horta, Danny; Schiavon, Ricardo P.

Stellar halos of galaxies retain crucial clues to their mass assembly history. It is in these galactic components that the remains of cannibalised galactic building blocks are deposited. For the case of the Milky Way, the opportunity to analyse the stellar halo's structure on a star-by-star basis in a multi-faceted approach provides a basis from w…

Classification and characterization using HCT/HFOSC spectra of carbon stars selected from the HES survey

Goswami, Aruna; Purandardas, Meenakshi

We present results from the analysis of 88 carbon stars selected from Hamburg/ESO (HES) survey using low-resolution spectra (R ∼1330 & 2190). The spectra were obtained with the Himalayan Faint Object Spectrograph Camera (HFOSC) attached to the 2-m Himalayan Chandra Telescope (HCT). Using well-defined spectral criteria based on the strength of …

Following the tidal trail: a history of modeling the Magellanic Stream

Lucchini, Scott

The formation of the Magellanic Stream has puzzled astronomers for decades. In this review, we outline the history of our understanding of the Magellanic System highlighting key observations that have revolutionized thinking of its evolution. We also walk through the major models and theoretical advances that have led to our current paradigm ‑ (1)…

Centering algorithm of an unresolved primary and satellite system

Peng, Q. Y.; Guo, B. F.; Hao, J. N.

Affected by the Earth's atmosphere, the image of a primary and satellite system may appear unresolved, such as the dwarf planet Haumea system. It is found by experiments that neither the two-dimensional Gaussian nor modified moment centering algorithms can accurately measure the photocenter of an image of unresolved primary and satellite system ob…