The optical spectrum of L1551 IRS 5

Details The optical spectrum of L1551 IRS 5 The optical spectrum of L1551 IRS 5

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297l..41m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. L41-L45.

Astronomy and Astrophysics

Astrophysics

94

Pre-Main Sequence Stars, Stellar Evolution, Stellar Mass Ejection, Visible Spectrum, Absorption Spectra, H Alpha Line, Lithium, Reflection Nebulae, Spectral Resolution

Scientific paper

A medium-resolution spectrum of the optically obscured young stellar object L1551 IRS 5 was obtained by observing the brightest parts of its associated reflection nebula. The H-alpha line in L1551 IRS 5 shows a P Cygni profile which is characterized by a strong, violet-displaced absorption component (-300 km/s) and a very weak emission component. Quite similar H-alpha line profiles are observed in FU Orionis stars, but not in T Tauri stars. The spectrum of IRS 5 also exhibits a broad absorption feature at 6497 A and possibly Li I 6707 absorption. From the strength of this former feature (a blend of Ca I, Fe I, and Ba II lines), a spectral type of G-K can be estimated. These characteristics suggest that L1551 IRS 5 is analogous to stars of the FU Ori class.

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