EDP Sciences
Free access
Volume 436, Number 2, June III 2005
Page(s) 653 - 659
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20052726

A&A 436, 653-659 (2005)
DOI: 10.1051/0004-6361:20052726

Properties of galactic B[e] supergiants

IV. Hen 3-298 and Hen 3-303
A. S. Miroshnichenko1, 2, 3, K. S. Bjorkman1, M. Grosso4, K. Hinkle5, H. Levato4 and F. Marang6

1  Ritter Observatory, Dept. of Physics and Astronomy, University of Toledo, Toledo, OH 43606-3390, USA
    e-mail: anatoly@physics.utoledo.edu
2  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
3  Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140 Saint-Petersburg, Russia
4  Complejo Astronómico El Leoncito (CASLEO), Casilla de Correo 467, 5400 San Juan, Argentina
5  National Optical Astronomical Observatories, PO Box 26732, Tucson, AZ 85726-6732, USA
6  South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa

(Received 18 January 2005 / Accepted 20 February 2005 )

We present the results of optical and near-IR spectroscopic and near-IR photometric observations of the emission-line stars Hen 3-298 and Hen 3-303. Strong emission in the H$\alpha$ line is found in both objects. The presence of Fe II and [O I] emission lines in the spectrum of Hen 3-298 indicates that it is a B[e] star. The double-peaked CO line profiles, found in the infrared spectrum of Hen 3-298, 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  $\log L/L_{\odot} \sim$ 5.1 and a spectral type of no earlier than B3 for Hen 3-298. Hen 3-303 seems to be a less luminous B-type object ( $\log L/L_{\odot} \sim$ 4.3), located in the same spiral arm.

Key words: stars: emission-line, B[e] -- stars: individual: Hen 3-298 -- stars: Hen 3-303 -- techniques: spectroscopic -- techniques: photometric -- circumstellar matter

SIMBAD Objects

© ESO 2005