Circumstellar gas associated with HL Tauri - Evidence for a remnant infalling envelope

Details Circumstellar gas associated with HL Tauri - Evidence for a remnant infalling envelope Circumstellar gas associated with HL Tauri - Evidence for a remnant infalling envelope

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339l..37g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 339, April 1, 1989, p. L37-L40. Research supported by USAF and NA

Astronomy and Astrophysics

Astrophysics

25

Cosmic Gases, Pre-Main Sequence Stars, Stellar Envelopes, Molecular Clouds, Radial Velocity, Stellar Composition, Stellar Spectra

Scientific paper

Molecular carbon absorption lines in the spectrum of HL Tau has been discovered near 8775 A. These C2 lines have a heliocentric radial velocity of 43 + or - 3 km/s, redshifted by 23 + or - 3 km/s relative to the star and the associated molecular cloud. This velocity difference suggests that the molecular carbon absorption arises in an infalling envelope. Since KI and diffuse interstellar bands are much weaker than expected, the chemical composition and/or excitation conditions in the HL Tau envelope appear to differ substantially from those in the interstellar medium.

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