Radial-Velocity of T Monocerotis and SV Vulpeculae.
Abstract
Radial-velocity-curves of T Mon and SV Vul from the Fe I lines are the mirror mages of the light- curves except for a slight lag in the velocity-curves. There seems to be a faithful repetition of these variations from epoch to epoch. Velocities from the Fe ii, Ti ii, Sr ii, and H lines tend to greater positive values than the Fe I velocities near maximum light. It is suggested that this may occur because the lifetime of a given surge of gas is slightly longer than the period associated with the light- and the Fe I velocity variations. Interstellar velocities of + 16.9 and -14 km/sec derived from the sharp absorption H and K lines of T Mon and SV Vul, respectively, are consistent with the velocities from the D lines assumed as blends of stellar and interstellar lines and with the galactic position of the two variables. Emission lines of H and K, greatly displaced shortward, were found on spectrograms of T Mon in the phase interval 22.3-26.9 days and at phase 43 3 days on one spectrogram of SV Vul Mean radii of 1190 (T Mon) and 1420 (SV Vul) have been derived.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1956
- DOI:
- 10.1086/146151
- Bibcode:
- 1956ApJ...123..201S