The circumstellar environment of IRAS 05327+3404

Details The circumstellar environment of IRAS 05327+3404 The circumstellar environment of IRAS 05327+3404

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346..441m&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

8

Stars: Circumstellar Matter, Stars: Evolution, Stars: Formation, Stars: Mass-Loss, Stars: Pre-Main Sequence

Scientific paper

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.

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