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Properties of galactic B[e] supergiants. IV. Hen3–298 and Hen3–303

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Anatoly S. Miroshnichenko, Associate Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: We present the results of optical and near-IR spectroscopic and near-IR photometric observations of the emission-line stars Hen3–298 and Hen3–303. Strong emission in the Ha line is found in both objects. The presence of Fe II and [O I] emission lines in the spectrum of Hen3–298 indicates that it is a B[e] star. The double-peaked CO line profiles, found in the infrared spectrum of Hen3–298, along with the optical line profiles suggest that the star is surrounded by a rotating circumstellar disc. Both objects also show infrared excesses, similar to those of B[e] stars. The radial velocities of the absorption and emission lines as well as a high reddening level suggest that the objects are located in the Norma spiral arm at a distance of 3–4.5 kpc. We estimated a luminosity of log L/L? 5.1 and a spectral type of no earlier than B3 for Hen 3–298. Hen3–303 seems to be a less luminous B-type object (log L/L? 4.3), located in the same spiral arm.

Additional Information

Publication
arXiv:astro-ph/0503155
Language: English
Date: 2008
Keywords
galactic B[e] supergiants, Hen3–298, Hen3–303, emission-line star, luminosity