Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..885h&link_type=abstract
Astronomical Journal, vol. 86, June 1981, p. 885-891.
Astronomy and Astrophysics
Astronomy
31
Early Stars, Nebulae, Stellar Envelopes, Stellar Spectrophotometry, T Tauri Stars, Absorption Spectra, Balmer Series, Cosmic Dust, Emission Spectra, Infrared Astronomy, Infrared Photometry
Scientific paper
Optical and infrared photometry has been obtained for the two stars (RNO 90 and RNO 91) illuminating reflection nebulae in the small, filamentary dust cloud L 43. Spectrograms of RNO 90 in the blue and red have also been obtained, which show that it is a T Tauri star. Both stars have strong infrared excesses, placing them firmly in the 'dust' position of the H - K, K - L diagram. The absorption reversals superimposed on the Balmer lines from H-alpha to H-delta in RNO 90 display an interesting effect. They appear to move progressively redward from a position near the blue edge of the emission line at H-alpha to a nearly central location at H-delta. L 43 is located near the star-forming end of the Sco OB2 association, but is relatively isolated from the major center of activity, the Rho Oph cloud. There are a large number of similar-looking small clouds in its vicinity, only one of which is known to have an associated T Tauri star (AS 209). The complexity of this, the nearest star-forming region in an OB association, is illustrated.
Herbst William
Warner John W.
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