The disk and environment of a young altair analog: SAO 206462

C. A. Grady, G. Schneider, M. L. Sitko, G. M. Williger, K. Hamaguchi, S. D. Brittain, K. Ablordeppey, D. Apai, L. Beerman, W. J. Carpenter, K. A. Collins, M. Fukagawa, H. B. Hammel, Th Henning, D. Hines, R. Kimes, D. K. Lynch, R. Pearson, R. W. Russell, F. MénardM. Silverstone, P. Smith, M. Troutman, D. Wilner, B. Woodgate

Research output: Contribution to journalConference articlepeer-review


Proto-planetary and transitional disks which are detected in scattered light provide a critical test of the interpretation of circumstellar disks based on the IR spectral energy distribution (SED) alone. The disk inclination to the line-of-sight, outter radius, and surface brightness (SB) maps or radial SB distributions provided by spatially resolved imaging remove most of the degeneracies inherent in fitting IR SEDs without such observational constraints. We have imaged the disk of SAO 206462 (HD 135344B) in 1.1 and 1.6μm scattered light with HST/NICMOS and can trace the essentially face-on disk out to 1.05". The cavity detected in sub-mm observations lies entirely under the NICMOS coronagraphic spot, a result consistent with the SED fitting if the star is at d=140pc. The SED had previously been classified as a Meeus Group I SED and interpreted as arising in a flared disk. Neither the 1.1 nor the 1.6μm radial surface brightness profiles are consistent with a flared disk. A FUSE FUV spectrum demonstrates the presence of excess light in this system, confirming the accretion rate estimated from Brγ. Collectively, these data strengthen the interpretation of this system as a transitional disk.

Original languageEnglish (US)
Pages (from-to)385-388
Number of pages4
JournalAIP Conference Proceedings
StatePublished - 2009
Event15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - St. Andrews, United Kingdom
Duration: Jul 21 2008Jul 25 2008


  • Accretion
  • Individual
  • Protoplanetary disks
  • Rotation
  • SAO 206462
  • Transitional disks

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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