Hostname: page-component-848d4c4894-ndmmz Total loading time: 0 Render date: 2024-05-06T05:40:32.108Z Has data issue: false hasContentIssue false
  • English
  • Français

Photospheric Activity among Early F-Type Stars

Published online by Cambridge University Press:  12 April 2016

L. Mantegazza ,
E. Poretti ,
E. Antonello  and
F. Zerbi
L. Mantegazza
Affiliation:
università di Pavia, Via Bassi 6 1-27100 Pavia
E. Poretti
Affiliation:
Osservatorio Astronomico di Brera, Via Bianchi 46 1-22055 Merate
E. Antonello
Affiliation:
Osservatorio Astronomico di Brera, Via Bianchi 46 1-22055 Merate
F. Zerbi
Affiliation:
università di Pavia, Via Bassi 6 1-27100 Pavia

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.

In the last decade stars showing variability of unclear origin have been detected among early F-type stars mainly as secondary results in the context of observational programmes devoted to the study of δ-Scuti and CP stars.

For this reason only a small number of these objects has been thoroughly studied: their positions in HR diagram is shown in fig.l.

Figure 1: HR diagram of the observed stars.

The stars in NGC 2516 have been singled out in a survey work by Antonello and Mantegazza (1986), HD 164615 has been studied by Abt et al.(1983), the variability in 9 Aur has been discovered by Krischinas et al.(1990,1991) and HD 23375 in Pleiades has been pointed out by Breger (1972). The solid line in Fig. 1 is the ZAMS and the dashed lines are the borders of the i-Scuti stars instability strip.

Type
VII. Activity, a break of spherical symmetry
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 651 - 653
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Abt, H.A., Bollinger, G. and Burke, E.W. jr., 1983, Ap.J, 272, 196 Google Scholar
Antonello, E. and Mantegazza, L., 1986, A&A, 164, 40 Google Scholar
Breger, M., 1972, Ap.J, 176, 367 Google Scholar
Giampapa, M.S. and Rosner, R., 1984, Ap.J, 286,L19 CrossRefGoogle Scholar
Krisciunas, K. and Guinan, E., 1990, Inf. Bull. Var. Stars n.3511 Google Scholar
Krisciunas, K. et al., 1991, Inf. Bull. Var. Stars, 3672 Google Scholar
Mantegazza, L. and Poretti, E., 1991, Inf. Bull. Var. Stars n.3690 Google Scholar
Radick, R.R., et al., 1982, P.A.S.P. 94, 934 Google Scholar
Radick, R.R., et al., 1983a, P.A.S.P., 95, 300 Google Scholar
Radick, R.R., et al., 1983b, P.A.S.P., 95, 631 Google Scholar
Simon, T., 1987, in Lectures Notes in Physics, 291, 265 Google Scholar
Wolff, S.C., 1987, In Lectures Notes in Physics, 291, 223 Google Scholar