The circumstellar environment of IRAS 05327+3404

Magnier, E. A.; Waters, L. B. F. M.; Groot, P. J.; van den Ancker, M. E.; Kuan, Y.-J.; Martín, E. L.
Referencia bibliográfica

Astronomy and Astrophysics, v.346, p.441-452 (1999)

Fecha de publicación:
6
1999
Número de autores
6
Número de autores del IAC
1
Número de citas
11
Número de citas referidas
8
Descripción
We continue our study of the young stellar object associated with IRAS 05327+3404. We have determined the spectral type of the central star to be K2. We show that the star is most likely seen directly, not via a reflection, and that the extinction is only A_V ~ 2.3 mag. The spectral energy distribution shows the presence of large amounts of circumstellar material. Near-IR and optical observations of the reflection nebula also demonstrate the presence of circumstellar material, and show the material to be arranged in a disk with a relatively wide central hole of ~ 33 degr opening angle. The central hole and a CO outflow are co-aligned, and are roughly aligned with the ionized outflow. Several surprising aspects remain: Although the system has a strong ionized outflow, there is little or no evidence of active accretion in the form of UV excess, veiling, or strong high-Balmer line emission. Also, the spectral energy distribution is very wide, and suggests that the original birth cloud had a large rotational velocity. We propose that the relative isolation of the system from other star formation activity may explain the relatively large circumstellar disk for a system with a well-exposed central star.