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19 papers · 1 filter
Galactic Punctuated Equilibrium: How to Undermine Carter's Anthropic Argument in Astrobiology
Milan M. Cirkovic, Branislav Vukotic, Ivana Dragicevic
We investigate a new strategy which can defeat the (in)famous Carter's "anthropic" argument against extraterrestrial life and intelligence. In contrast to those already considered…
Optical Observations of M81 Galaxy Group in Narrow Band [SII] and H_alpha Filters: Holmberg IX
B. Arbutina, D. Ilic, K. Stavrev +3
We present observations of the nearby tidal dwarf galaxy Holmberg IX in M81 galaxy group in narrow band [SII] and H filters, carried out in March and November 2008 with the 2m R…
The interacting binary V 393 Scorpii: another clue for Double Periodic Variables
Ronald Mennickent, Zbigniew Kolaczkowski, Gojko Djurasevic +2
We give a brief report on spectroscopic properties of V 393 Scorpii. H alfa emission and shape and radial velocity of He I 5875 are modulated with the long cycle. The long cycle is…
Chaotic Transport and Chronology of Complex Asteroid Families
Bojan Novakovic, Kleomenis Tsiganis, Zoran Knezevic
We present a transport model that describes the orbital diffusion of asteroids in chaotic regions of the 3-D space of proper elements. Our goal is to use a simple random-walk model…
Long-term variability of the optical spectra of NGC 4151: II. Evolution of the broad Ha and Hb emission-line profiles
A. I. Shapovalova, L. C. Popovic, A. N. Burenkov +5
Results of the long-term (11 years, from 1996 to 2006) H and H line variations of the active galactic nucleus of NGC 4151 are presented. High quality spectra (S/N>50 and R~8A…
Hydrogen Balmer Emission Lines and the Complex Broad Line Region Structure
G. La Mura, F. Di Mille, L. Č. Popović +3
In this work we investigate the properties of the broad emission line components in the Balmer series of a sample of Type 1 Active Galactic Nuclei (AGN). Using the Boltzmann Plot m…