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25 April 2024 |
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The Enigmatic Young Object: Walker 90/V590 Mon | | Mario R. Perez
; Bruce McCollum
; Mario E. van den Ancker
; Michael D. Joner
; | | Date: |
8 Apr 2008 | | Abstract: | }{We assess the evolutionary status of the intriguing object Walker 90 (V590
Mon, LkH$alpha$ 25, NGC 2264-Vas62, HBC 219, IRAS 06379+0950, 2MASS
J06404464+0948021), which is located about 20 arcminutes north-west of the Cone
Nebula near the center of the open cluster NGC 2264. This object shows the
classical signs of a young pre-main sequence object such as highly variable
H$alpha$ emission, Mg II emission, IR excess, UV continuum and optical
variability.}{We analyzed a collection of archival and original data, ranging
from optical to near-infrared photometry plus imaging, and spectroscopic data
from ultraviolet to optical data.}{Based on recent photometric data secured in
2007, we find Walker 90 at its brightest recorded optical magnitude
($ar{12.47} pm 0.06$ for 2007 photometric data). We document an evolution in
spectral type in the last five decades (from A2/A3 to currently B7 and as early
as B4) and a decrease of the near-infrared K fluxes. Walker 90 appears as a
point source ($<0.1arcsec$) with an upper limit for a disk size of ~80 AU,
suggesting an age of 7--10 Myr. Evidence of turbulent inflows is detected by
inverse P-Cygni profiles in the lower Balmer lines. We measured a steep UV
continuum fluxes and the tentative identification of N V emission, implying a
strong non-stellar energetic component, such as the flux arising from a
thermally inhomogeneous accretion disk. We conclude that W90 is likely a flared
disk system and a somewhat evolved young stellar object surrounded by an
inclined optically thick accretion disk, geometry which is capable of
explaining many observational features.}{} | | Source: | arXiv, 0804.1365 | | Services: | Forum | Review | PDF | Favorites | |
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