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Preliminary Statistical Analysis of Lambda Boötis Stars

Paunzen, E.; Hakobyan, A. A.; Alecian, G. +1 more

To enlarge our database of Chemically Peculiar stars, we compiled published data concerning the Lambda Boötis stars observed by high-resolution spectroscopy techniques during last decades. In total, 62 Lambda Boötis stars have been added to the database. To deepen our knowledge on statistical overview of the abundance anomalies versus the physical…

Study of DFBS Late-Type Stars at High Galactic Latitudes

Kostandyan, G. R.

We study in this thesis relatively bright late-type giants found in the First Byurakan Survey (FBS) data base. We present the 2nd version of the catalogue of FBS LTS with new data (FBS LTS v2), 1471 objects. It is a homogeneous and complete database for high- Galactic late-type stars, including M and C types. Since 2007, all FBS low-resolution spe…

Variability study of the FBS M giants

Gigoyan, K. S.; Kostandyan, G. R.

We study in this paper variability of the late-type M giants found in the First Byurakan Survey (FBS) spectroscopic data base. We used phase dependent light - curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and All-Sky Automated Survey for Supernovae (ASAS-SN). We used also the distance information derived from …

On the origin of runaway binaries: the case of the HMXB 4U 2206+54/BD +53 2790

Neuhäuser, R.; Mugrauer, M.; Stoyanov, K. A. +7 more

We present most probable place and time of the origin of the runaway high-mass X-ray binary 4U 2206+54 based on its Gaia EDR3 astrometric parameters and our new systemic radial velocity. We studied the trace back motion of the system and propose that it originated in the subgroup of the Cepheus OB1 association (Age~4-10 Myr) with its brightest sta…