Skip to main content Accessibility help
×
×
Home

VLBA observations of the 7mm SiO masers in TX Cam and R Cas

  • Jiyune Yi (a1), Roy S. Booth (a1), John E. Conway (a1), Anders Winnberg (a1) and Phillip J. Diamond (a2)...

Abstract

Simultaneous VLBI observations of the SiO masers of the J = 1 → 0 rotational line in the v = 1 and v = 2 vibrational levels toward Mira variables are presented. Because SiO maser lines are formed deep in circumstellar envelopes they serve as a unique tool to study the innermost envelopes of evolved stars. Although the first interpretation of SiO maser emission was made in 1974, observational features are only partially explained by models which have been suggested since then. Positional coincidence of the J = 1 → 0 masers of v = 1 and v = 2 has been argued as a way to distinguish among the maser pumping models, but it requires simultaneous observations of the two lines using high resolution. We have developed the technique for such observations during the last few years and here we report successful results of our simultaneous observations of the SiO v = 1 and v = 2 J = 1 → 0 masers using the Very Long Baseline Array (VLBA). We discuss the pumping mechanism in terms of our observational results.

    • 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.

      VLBA observations of the 7mm SiO masers in TX Cam and R Cas
      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.

      VLBA observations of the 7mm SiO masers in TX Cam and R Cas
      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.

      VLBA observations of the 7mm SiO masers in TX Cam and R Cas
      Available formats
      ×

Copyright

References

Hide All
Diamond, P.J. & Kemball, A.J. 1999, in IAU Symp. 191, Asymptotic Giant Branch Stars, eds. Le Bertre, T. et al. (ASP)
Gray, M.D. & Humphreys, E.M.L. 2000, New Ast., 5, 155
Humphreys, E.M.L., Gray, M.D., Yates, J.A., Field, D., Bowen, G., & Diamond, P.J. 1996, MNRAS, 282, 1359
Kwan, J., & Scovill, N. 1974, ApJ, 194, L97
Miyoshi, M., Matsumoto, K., Kameno, S., Takaba, H., & Iwata, T. 1994, Nature, 371, 395
Yi, Jiyune, Booth, R.S., Conway, J.E., Diamond, P.J., & Winnberg, A. 2000, in Pro. The 5th EVN Symposium, eds. Conway, J.E. et al. (Chalmers University of Technology)
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Proceedings of the International Astronomical Union
  • ISSN: -
  • EISSN: 0074-1809
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

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