Identifying T Tauri Stars Using Bandpass Photometry

Details Identifying T Tauri Stars Using Bandpass Photometry Identifying T Tauri Stars Using Bandpass Photometry

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.0509d&link_type=abstract

American Astronomical Society Meeting 203, #05.09; Bulletin of the American Astronomical Society, Vol. 35, p.1211

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Scientific paper

We investigate the use of narrow-band images of star-forming regions as a way to identify T Tauri stars from photometry. This method would be particularly useful in studying distant star-forming regions where spectroscopic surveys are more difficult to conduct. In principle, Hα emission can be detected using one narrow-band filter on the Hα line and another off the line to measure the nearby continuum. We have a large data archive of images of star-forming regions centered on the Hα line and on the [S II] 6717/6731 lines, and have studied the feasibility of using the latter as a continuum filter. We conclude that such a filter of any bandpass width, no matter how narrow, would permit the identification of many, but not all, classical T Tauri stars (Hα equivalent widths down to 10 Å). This is due to the appearance within the Hα filter of a titanium oxide band for late-type stars. In order to unambiguously detect all stars with Hα emission, even for very late types, the continuum filter must be narrower and located nearer the Hα line. Two filters abutting each other (e.g. a 20 Å bandpass filter at λ 6583 Å or even a 40 Å bandpass filter at λ 6603 Å) would allow the identification of all T Tauri stars that do not suffer extreme reddening.

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