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A collimated, high-speed outflow from the dying star V Hydrae

Abstract

Stars with masses in the range 1–8 solar masses (M) live ordinary lives for 109–1010 years, but die extraordinary deaths. First, during their death throes as asymptotic giant branch (AGB) stars they eject, over 104–105 years, half or more of their mass in slowly expanding, spherical winds, and then, in a short (a few 100–1,000 years) and poorly understood phase, they are transformed into aspherical planetary nebula. Recent studies support the idea that high-speed, jet-like flows play a crucial role in this transformation1. Evidence for such outflows is indirect, however; this phase is so short that few nearby stars are likely to be caught in the act. Here we report the discovery of a newly launched, high-speed jet-like outflow in the nearby AGB star, V Hydrae. We have detected both proper motions and ongoing evolution in the jet. These results support a model in which the jet is driven by an accretion disk around an unseen, compact companion. We also find a central, dense equatorial disk-like structure which may enable and/or enhance the formation of the accretion disk.

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Figure 1: Optical line emission from a high-velocity, jet-like, knotty outflow in the carbon star V Hya.
Figure 2: A geometrical model of the high-velocity knotty jet and the central continuum source in V Hya.
Figure 3: Observations and geometrical model of a central, dense, equatorial disk in V Hya.
Figure 4: Maps of the CO J = 1–0 emission from V Hya.

References

  1. 1

    Sahai, R. & Trauger, J. T. Multipolar bubbles and jets in low-excitation planetary nebulae: toward a new understanding of the formation and shaping of planetary nebulae. Astron. J. 116, 1357–1366 (1998)

    ADS  Article  Google Scholar 

  2. 2

    Kahane, C., Maizels (Barnbaum), C. & Jura, M. The bipolar outflow from the rotating carbon star, V Hydrae. Astrophys. J. 328, L25–L28 (1988)

    ADS  CAS  Article  Google Scholar 

  3. 3

    Sahai, R. & Wannier, P. Discovery of very high velocity outflow in V Hydra—Wind from an accretion disk in a binary? Astron. Astrophys. 201, L9–L12 (1988)

    ADS  CAS  Google Scholar 

  4. 4

    Sugerman, B., Sahai, R. & Hinkle, K. in CO: Twenty-Five Years of Millimeter-Wave Spectroscopy (eds Latter, W. B., Radford, S. J. E., Jewell, P. R., Magnum, J. G. & Bally, J.) 108–111 (IAU Symp. Vol. 170, Kluwer Academic, Dordrecht, 1996)

    Google Scholar 

  5. 5

    Kahane, C., Audinos, P., Barnbaum, C. & Morris, M. V Hydrae: the missing link between spherical red giants and bipolar planetary nebulae? Radio observations of the molecular envelope. Astron. Astrophys. 314, 871–882 (1996)

    ADS  Google Scholar 

  6. 6

    Knapp, G. R., Jorissen, A. & Young, K. A 200 km/sec molecular wind in the carbon star V Hya. Astron. Astrophys. 326, 318–328 (1997)

    ADS  Google Scholar 

  7. 7

    Lloyd Evans, T. Optical spectroscopy of the jet in V Hydrae. Mon. Not. R. Astron. Soc. 248, 479–482 (1991)

    ADS  Article  Google Scholar 

  8. 8

    Knapp, G. R. et al. The light curve and evolutionary status of the carbon star V Hya. Astron. Astrophys. 351, 97–102 (1999)

    ADS  CAS  Google Scholar 

  9. 9

    Barnbaum, C., Morris, M. & Kahane, C. Evidence for rapid rotation of the carbon star V Hydrae. Astrophys. J. 450, 862–875 (1995)

    ADS  CAS  Article  Google Scholar 

  10. 10

    Lee, C-F. & Sahai, R. Shaping proto-planetary and young planetary nebulae with collimated fast winds. Astrophys. J. 586, 319–337 (2003)

    ADS  Article  Google Scholar 

  11. 11

    Lloyd Evans, T. in The Carbon Star Phenomenon (ed. Wing, R. F.) Vol. 177, 367–376 (IAU Symp., Kluwer, Dordrecht, 2000)

    Google Scholar 

  12. 12

    Hartigan, P., Raymond, J. & Hartmann, L. Radiative bow shock models of Herbig-Haro objects. Astrophys. J. 316, 323–348 (1987)

    ADS  CAS  Article  Google Scholar 

  13. 13

    Livio, M. in Accretion Phenomena and Related Outflows (eds Wickramasinghe, D. T., Bicknell, G. V. & Ferrario, L.) 845–860 (ASP Conf. Ser. 121, IAU Colloq. 163, Astronomical Society of the Pacific, San Francisco, 1997)

    Google Scholar 

  14. 14

    Morris, M. Mechanisms for mass loss from cool stars. Publ. Astron. Soc. Pacif. 99, 1115–1122 (1987)

    ADS  CAS  Article  Google Scholar 

  15. 15

    Soker, N. & Rappaport, S. The formation of very narrow waist bipolar planetary nebulae. Astrophys. J. 538, 241–259 (2000)

    ADS  CAS  Article  Google Scholar 

  16. 16

    Soker, N. Jet formation in the transition from the asymptotic giant branch to planetary nebulae. Astrophys. J. 389, 628–634 (1992)

    ADS  CAS  Article  Google Scholar 

  17. 17

    Alcolea, J., Bujarrabal, V., Sánchez Contreras, C., Neri, R. & Zweigle, J. The highly collimated bipolar outflow of OH 231.8 + 4.2. Astron. Astrophys. 373, 932–949 (2001)

    ADS  CAS  Article  Google Scholar 

  18. 18

    Imai, H., Obara, K., Diamond, P. J., Omodaka, T. & Sasao, T. A. A collimated jet of molecular gas from a star on the asymptotic giant branch. Nature 417, 829–831 (2002)

    ADS  CAS  Article  Google Scholar 

  19. 19

    Kastner, J. H. et al. Compact X-ray source and possible X-ray jets within the planetary nebula Menzel 3. Astrophys. J. 591, L37–L40 (2003)

    ADS  Article  Google Scholar 

  20. 20

    Kellogg, E., Pedelty, J. A. & Lyon, R. G. The X-ray system R Aquarii: A two-sided jet and central source. Astrophys. J. 563, L151–L155 (2001)

    ADS  CAS  Article  Google Scholar 

  21. 21

    Bally, J. in Accretion Phenomena and Related Outflows (eds Wickramasinghe, D. T., Bicknell, G. V. & Ferrario, L.) 3–13 (ASP Conf. Ser. 121, IAU Colloq. 163, Astronomical Society of the Pacific, San Francisco, 1997)

    Google Scholar 

  22. 22

    Reipurth, B., Heathcote, S., Morse, J., Hartigan, P. & Bally, J. Hubble Space Telescope images of the HH 34 jet and bow shock: Structure and proper motions. Astron. J. 123, 362–381 (2002)

    ADS  Article  Google Scholar 

  23. 23

    Soker, N. Pairs of bubbles in planetary nebulae and clusters of galaxies. Publ. Astron. Soc. Pacif. 115, 1296–1300 (2003)

    ADS  Article  Google Scholar 

Download references

Acknowledgements

We thank H. Imai for commenting on an earlier version of this paper. We are grateful to NASA for partial financial support, obtained through: the Long Term Space Astrophysics programme for R.S. and M.M.; and grants for R.S. from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under a NASA contract.

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Correspondence to R. Sahai.

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Sahai, R., Morris, M., Knapp, G. et al. A collimated, high-speed outflow from the dying star V Hydrae. Nature 426, 261–264 (2003). https://doi.org/10.1038/nature02086

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