Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-25T16:58:02.799Z Has data issue: false hasContentIssue false
  • English
  • Français

Quasicyclic Light Changes in Three Low Mass T Tauri Stars

Published online by Cambridge University Press:  12 April 2016

H. Mauder
H. Mauder*
Affiliation:
Astronomisches Institut / Universität, Tübingen, 7400 Tübingen, West Germany

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

During a photographic survey of the Chamaeleon T association in 1971/1972, evidence was found for quasiperiodic light changes of three variable stars, see Mauder and Sosna (1975). The period of 6.2 days for SY Cha is well seen, the periods of 7 days for VZ Cha and of 8 days for TW Cha are less pronounced. Intrinsic variations are present in addition to the cyclic variations. The three stars were classified by Hoffmeister (1963) as T Tauri type stars from their light variations. Objective prism spectra obtained by Henize and Mendoza (1973) confirm this classification, they found conspicuous emission lines. For SY Cha and TW Cha they got slit spectra, too, which show the typical veiling. The stars SY Cha, TW Cha and VZ Cha have been observed in the UBV system from 1974 March 12 until 1974 March 22, using the ESO standard photometer. In Figures 1 - 3 the light and colour curves are given for SY Cha, TH Cha and VZ Cha. Each point is a mean of generally 8 to 12 integrations, each integration lasting 5 seconds.

Type
Part I: Young Objects
Information
International Astronomical Union Colloquium , Volume 42: The Interaction of Variable Stars with their Environment , 1977 , pp. 66 - 71
Copyright
Copyright © Veröff. Der Remeis-Sterwarte 1977

References

Appenzeller, I., 1977, private communicationGoogle Scholar
Friedmann, C., Gürtler, J., 1975, Astron. Nachr. 296, 125 CrossRefGoogle Scholar
Grasdalen, G., Joyce, R., Knacke, R. P., Strom, S. E., Strom, K. M., 1975, A. J. 80, 117 Google Scholar
Grossmann, A. S., Graboske, H. C., 1971, Ap. J. 164, 475 Google Scholar
Henize, K. G., Mendoza, E. E., 1973, Ap. J. 180, 115 CrossRefGoogle Scholar
Hoffmeister, C., 1963, Veröff. Sonneberg 6, 1 Google Scholar
Hoffmeister, C., 1965, Veröff. Sonneberg 6, 97 Google Scholar
Iben, I., 1965, Ap. J. 141, 993 Google Scholar
Kippenhahn, R., 1977, private communicationGoogle Scholar
Mauder, H., Sosna, F. M., 1975, Inf. Bull. Var. Stars 1049 Google Scholar
Poveda, A., 1965, Bol. Obs. Tonantzintlay Tacubaya 4, 15 Google Scholar