Spectral Analysis of Mid-IR Excesses of WDs

Details Spectral Analysis of Mid-IR Excesses of WDs Spectral Analysis of Mid-IR Excesses of WDs

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..467b&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 467-472 (2010).

Physics

White Dwarfs, Spectral Analysis, Planetary Nebulae, Spectroscopy, Interstellar Matter, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Planetary Nebulae, Spectroscopy And Spectrophotometry, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers

Scientific paper

In our Spitzer 24 μm survey of hot white dwarfs (WDs) and archival Spitzer study of pre-WDs, i.e., central stars of planetary nebulae (CSPNs), we found mid-IR excesses for ~15 WDs/pre-WDs. These mid-IR excesses are indicative of the presence of circumstellar dust that could be produced by sub-planetary objects. To further assess the nature of these IR-excesses, we have obtained Spitzer IRS, Gemini NIRI and Michelle, and KPNO 4m echelle spectra of these objects. In this paper we present the analysis of these spectroscopic observations and discuss the nature of these IR excesses.

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