Výsledky vyhledávání - "Gigoyan, Kamo"

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A search for distant, pulsating red giants in the southern halo

Autor: Mauron, Nicolas, Gigoyan, Kamo S., Kendall, Tim R., Hambleton, Kelly M.

To investigate the asymptotic giant branch (AGB) population in the Galactic halo, we search for pulsating AGB stars at a heliocentric distance over 50kpc. Our research is based on the Catalina Southern Survey (CSS) catalogue of variables, comprising

Externí odkaz: http://arxiv.org/abs/2104.15037

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Investigation of long-period variables in the Catalina Southern catalog: new carbon stars and false objects

Autor: Mauron, Nicolas, Gigoyan, Kamo S., Gigoyan, Karen K., Maurin, Luc P. A., Kendall, Tim R.

As part of our ongoing study of the evolved giants in the galactic halo, we consider the sample of 1286 long-period variables (LPVs) in the southern hemisphere provided by the Catalina Sky Survey experiment. These LPVs have periods P larger than 80 d

Externí odkaz: http://arxiv.org/abs/1901.11427

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The variable V381 Lac and its possible connection with the R CrB phenomenon

Autor: Rossi, Corinne, Dell'Agli, Flavia, Di Paola, Andrea, Gigoyan, Kamo S., Nesci, Roberto

We have performed new medium resolution spectroscopy, optical and near infrared photometry to monitor the variability of the AGB carbon star V 381 Lac. Our observations revealed rapid and deep changes in the spectrum and extreme variability in the op

Externí odkaz: http://arxiv.org/abs/1512.00146

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AGB stars and the plate archives heritage

Autor: Nesci, Roberto, Gaudenzi, Silvia, Rossi, Corinne, Pezzotti, Camilla, Gigoyan, Kamo, Mauron, Nicolas

We report on the characterization of a number of AGB candidate stars identified with objective-prism plates of the Byurakan Observatory. Digitized photographic sky survey plates and recent CCD photometry have been used to improve the selection and di

Externí odkaz: http://arxiv.org/abs/1404.3842

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Cool carbon stars in the halo and in dwarf galaxies: Halpha, colours, and variabiity

Autor: Mauron, Nicolas, Gigoyan, Kamo S., Berlioz-Arthaud, Paul, Klotz, Alain

The population of cool carbon (C) stars located far from the galactic plane is probably made of debris of small galaxies such as the Sagittarius dwarf spheroidal galaxy (Sgr), which are disrupted by the gravitational field of the Galaxy. We aim to kn

Externí odkaz: http://arxiv.org/abs/1311.6977

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