The Intensities and Profiles of Lines in Some B-Type Stars.

Abstract

view Abstract Citations (19) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Intensities and Profiles of Lines in Some B-Type Stars. Underhill, Anne. B. Abstract The equivalent widths and central absorptions of Hy, H5, the Hei lines XX 4471, 4026, 4388, 4144, 4009; the Mgii line X 4481; the Siii lines X 4128, X 4130; and the Si iii lines XX 4552, 4568, 4574 have been found from McDonald coudé plates for the B-type supergiants p Leo, x2 On, o2 CMa, x Aur, i~ CMa, and ~3 On, and for the less luminous stars CMa, `y Peg, r Her, and ~ Dra. The central absorptions are corrected for instrumental distortion. Profiles of Hy are given for all the stars studied. Profiles of the other lines are given only for o2 CMa, CMa, and -y Peg. The interpretation of the hydrogen-line profiles is discussed, and model atmospheres with Oo = 0.30 and log g = 2.00 and 4.09 are calculated. The line intensities predicted from these models are compared with the observed intensities in o2 CMa, and `y Peg; and it is shown how such models can be used to derive relative abundances of the elements and the shape of the line-absorption coefficient. The line- absorption coefficient is found to have a Doppler half-width z~XD of 37 ± 2 km/sec in the supergiant o2 CMa, and 27 ± 2 km/sec in the giant e CMa Publication: The Astrophysical Journal Pub Date: May 1948 DOI: 10.1086/145018 Bibcode: 1948ApJ...107..349U full text sources ADS |