Properties of galactic B[e] supergiants. IV. Hen 3-298 and Hen 3-303
Abstract
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 Hα 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⊙ ∼ 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⊙ ∼ 4.3), located in the same spiral arm.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2005
- DOI:
- 10.1051/0004-6361:20052726
- arXiv:
- arXiv:astro-ph/0503155
- Bibcode:
- 2005A&A...436..653M
- Keywords:
-
- stars: emission-line;
- B[e];
- stars: individual: Hen 3-298;
- stars: Hen 3-303;
- techniques: spectroscopic;
- techniques: photometric;
- circumstellar matter;
- Astrophysics
- E-Print:
- 8 pages, 5 figures, accepted by Astronomy and Astrophysics