Publication details
Time-Dependent Spectral Feature Variations of the FS CMa Star HD 50138
| Authors | |
|---|---|
| Year of publication | 2017 |
| Type | Article in Proceedings |
| Conference | The B[e] Phenomenon: Forty Years of Studies |
| MU Faculty or unit | |
| Citation | |
| Doi | http://dx.doi.org/10.1051/0004-6361/201526290 |
| Field | Astronomy and astrophysics |
| Keywords | circumstellar matter; stars: emission line Be; stars: mass loss; binaries: spectroscopic; stars: individual: MWC 158 |
| Description | HD 50138 (V743 Mon, MWC 158, or IRAS 06491-0654) is a B[e] star of the FS CMa type. It is supposed to be a post-main-sequence star, which is still not highly evolved. The presence of a gaseous and dusty envelope precludes direct observations of the central object, and the possible binarity and physical nature of HD 50138 remains unclear. We present a long-term spectroscopic monitoring of this object over the last 20 years (Jeřábková et al. 2016). Based on the obtained data, we confirm a quasi-periodic behavior of the object's spectral variability with two newly found long periods manifested in the Halpha and forbidden [O I] lines. The rotating structures around the object are supported by the detection of moving humps in the Halpha profile. Our results are consistent with either mass transfer in a binary system or the presence of an outflowing disk. Since our data cannot confirm the presence of a binary companion, the origin of such systems remains an interesting problem for further investigation. |