Accession Number : AD0623472

Title :   THE EFFECT OF LINE EMISSION UPON THE B-V COLORS OF T TAURI OBJECTS.

Descriptive Note : Final rept. of Research in Stellar Spectroscopy,

Corporate Author : STEWARD OBSERVATORY UNIV OF ARIZONA TUCSON

Personal Author(s) : Aveni,Anthony F. ; Carpenter,Edwin F. ; Meinel,A. B.

Report Date : 1965

Pagination or Media Count : 25

Abstract : A method was developed to determine the influence of line omission upon the UBV colors of the T Tauri objects T Tau and RW Aur. Calibrated spectra of these objects were obtained using the Steward Observatory 36-inch telescope and the Carpenter F 0.8 nebular spectrograph. These spectra were corrected for instrumental and atmospheric effects and two colors were computed from microdensitometer traces of each spectrum: (1) thecontinuum color devoid of emission lines, and (2) the color including emission lines. The latter color can then be directly compared to the observed photometric color. Comparison of the observed R-V colors with the computed B-V shows good agreement, indicating that the photographic corrections were properly assessed. The difference of the solors obtained for the continuum, (B-V) sub c, and the continuum plus line emission, (B-V0 sub c1, shows apparent variations between Om.07 and Om 14 and T Tau and between Om 6 and Om15 for RW Aur, with some dependence upon continuum color. The line emission parameter shifts the position of both stars to the right in the log L/L sub o, log Te diagram; this can be interpreted as a correction to the contraction age of up to 20%.

Descriptors :   (*VARIABLE STARS, LINE SPECTRA), (*SPECTROSCOPY, VARIABLE STARS), COLORS, SPECTRUM ANALYZERS, EMISSIVITY, ABSORPTION SPECTRA

Distribution Statement : APPROVED FOR PUBLIC RELEASE