... The presence of solidstate emission bands is compared to other indicators of circumstellar material, such as Hff emission, optical variability and submm continuum fluxes. ... However, a strong dependence on spectral type of the central star seems to be present: stars with spectral type earlier than B9 show either amorphous silicate in absorption or infrared spectra dominated by PAH emission, whereas more than 70% of the stars of later spectral type show silicate emission. ...
Transactions IAU, Volume XXVIIA Reports on Astronomy 2006-2009 Karel A. van der Hucht, ed. c 2009 International Astronomical Union DOI: 00.0000/X000000000000000X DIVISON XI I/COMMISSION 5 / WORKING GROUP LIBRARIES CHAIR CO-CHAIR MEMBERS Uta Grothkopf, ESO Fionn Murtagh, Univ. ... Librarians are taking on new and diversified roles. ... Uta Grothkopf, Fionn Murtagh chairs of Working Group References Grothkopf, U. & Erdmann, C. 2008, IAU Inf Bul l no. 102, in press Mahoney, T.J. 2007, Obs 127, 401 ...
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