Skip to main content Accessibility help
×
Home

Spectroscopic EUVE Observations of the Active Star AB Doradus

  • Slavek M. Rucinski (a1), Rolf Mewe (a2), Jelle S. Kaastra (a2), Osmi Vilhu (a3) and Stephen M. White (a4)...

Abstract

We present observations of the pre-Main Sequence, rapidly-rotating (0.515 day) late-type star, AB Doradus (HD 36705), made by the Extreme Ultraviolet Explorer (EUVE) satellite. A high-quality spectrum was accumulated between November 4-11, 1993, with an effective exposure time of about 40 hours. The data constrain the coronal temperature structure between several 104 K up to roughly 2 × 107 K through a differential emission measure analysis using an optically-thin plasma model. The resulting differential emission measure (DEM) distribution shows: a) dominant emission from plasma between about 2 × 106 K and 2 × 107 K, b) very little emission from plasma between 105 K and 2 × 106 K, and c) emission from plasma below about 105 K. If solar photospheric abundances are assumed, then the formal DEM solution also requires the presence of a strong high-temperature component (above about 3 × 107 K) in order to fit the strong continuum emission below about 150 Å; however, we believe that this component of the solution is not physical. The DEM analysis gives a best-fit value for the interstellar hydrogen column density of NH = (2.4 ± 0.5) × 1018 cm−2.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Spectroscopic EUVE Observations of the Active Star AB Doradus
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Spectroscopic EUVE Observations of the Active Star AB Doradus
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Spectroscopic EUVE Observations of the Active Star AB Doradus
      Available formats
      ×

Copyright

References

Hide All
Anders, E. & Grevesse, N. 1989, Geochimica et Cosmochimica Acta, 53, 197
Beasley, A.J. & Cram, L.E. 1993, MNRAS, 264, 570
Collier, A.C. 1982, MNRAS, 200, 489
Collier, Cameron, A., Bedford, D.K., Rucinski, S.M., Vilhu, O. & White, N.E. 1988, MNRAS, 231, 131
Innis, J.L., Thompson, K. & Coates, D.W. 1986, MNRAS, 223, 183
Kaastra, J.S. & Mewe, R. 1993, Legacy, 3, 16
Kürster, M., Schmitt, J.H.M.M. & Fleming, T.A. 1992, Cool Stars, Stellar Systems, And the Sun, ed. Giampapa, M.S. & Bookbinder, J.A., ASP Conf. Ser. 26, 109
Lim, J., Nelson, G.J., Castro, C., Kilkenny, D. & Van Wyk, F. 1992, ApJ, 388, L27
Lim, J., White, S.M., Nelson, G.J., & Benz, A.O. 1994, ApJ, 430, 332
Mewe, R., Gronenschild, E.H.B.M., Van Den Oord, G.H.J. 1985, A&AS, 62, 197
Mewe, R., Lemen, J.R., Van Den Oord, G.H.J. 1986, A&AS, 65, 511
Mewe, R., Kaastra, J.S. 1994, European Astronomical Society Newsletter, 8, 3
Mewe, R., Kaastra, J.S., Schrijver, C.J., Van Den Oord, G.H.J. & Alkemade, F.J.M. 1995a, A&A, 296, 477
Mewe, R., Kaastra, J.S., Pallavicini, R., White, S.M. 1995b, in prereparation
Pakull, M.W. 1981, A&A, 104, 33
Rucinski, S.M. 1982, Inf. Bull. Var. Stars, 2203
Rucinski, S.M. 1985, MNRAS, 215, 591
Rumph, T., Bowyer, S. & Vennes, S. 1994, AJ, 107, 2108
Schrijver, C.J., Mewe, R., Van Den Oord, G.H.J., Kaastra, J.S. 1995, A&A, in press
Vilhu, O., Gustafsson, B. & Edvardson, B. 1987, ApJ, 320, 850
Vilhu, O., Tsuru, T., Collier, , Cameron, A., Budding, E., Banks, T., Slee, O.B., Ehrenfreund, P. & Foing, B.H. 1993, A&A, 278, 467
Vilhu, O. & Walter, F.M. 1987, ApJ, 321, 958
White, S.M., Lim, J., Rucinski, S., Roberts, G., Ryan, S., Prado, P., Kilkenny, D., & Kundu, M.R. 1985a, ApJ, in prereparation
White, S.M., Pallavicini, R., & LiM, J. 1995b, ApJ, in prereparation

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed