Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1956m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, Dec. 1988, p. 1956-1964. Research supported by the Fund for Research in Astrophy
Astronomy and Astrophysics
Astrophysics
21
Binary Stars, Pre-Main Sequence Stars, Stellar Rotation, Stellar Spectrophotometry, Absorption Spectra, Radial Velocity, Star Formation, Ubv Spectra
Scientific paper
Spectroscopic and photometric observations of the star Parenago 1540 (V = 11.3), located 10 arcmin west of the Trapezium in Orion, have shown the star to be a pre-main-sequence double-lined spectroscopic binary. Thirty-seven radial-velocity measurements were obtained from which the orbital elements of the binary were determined, in particular an orbital period P = 33.73±0.03 days and an eccentricity of e = 0.12±0.01. High-dispersion spectra reveal strong Li 6707 Å absorption lines in each of the components of P 1540. A spectrum at lower dispersion also shows strong C II H and K emission lines, not resolved into individual components. P 1540 also has an X-ray emission of 4×1030ergs s-1. UBVRI photometry, combined with relative luminosities at V determined from spectra, have been used to determine the locus of each component in the theoretical H-R diagram.
Marschall Laurence A.
Mathieu Robert D.
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