Journal
ASTRONOMICAL JOURNAL
Volume 156, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-3881/aacbd8
Keywords
line: profiles; open clusters and associations: general; stars: early-type; stars: emission-line, Be
Categories
Funding
- National Science Foundation of Bulgarian Ministry of education and science [DN 08-1/2016, DN 08-20/2016]
- Shumen University [RD 08-142]
- National Aeronautics and Space Administration
- Institute of Astronomy and Rozhen National Astronomical Observatory, Bulgarian Academy of Sciences
Ask authors/readers for more resources
This paper presents the results of 4 years of high-resolution spectral observations of 69 emission-line stars, 54 of them being newly discovered sources. We classified the stars on the basis of their position in the two-color IR diagram and some additional criteria: shape and width of the H alpha profile, presence of He lines, proper motion and parallax, membership to open cluster and associations. Sixty of our targets turned out to be Be stars. We also found four late giants, four pre-MS stars, and one late dwarf. The H alpha emission profiles of our Be stars range from single peaked to typical shell profiles that can also be highly asymmetric or single-peaked profiles with a narrow absorption core. The emission profiles appear almost constant with time or highly variable in intensity and in their V/R ratio. The detected long-term variability of the H alpha emission is important for investigating the on/off switch phenomenon of Be stars. Our study led to an increase of the number of the emission-line stars of 16 open clusters.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available