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The photospheric spectrum of the pre-FUor V1331 CYG: Is it a star or a disk?

  • Galaxy Stars
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Bulletin of the Crimean Astrophysical Observatory

Abstract

The T Tauri variable V1331 Cyg is characterized by an intensive emission spectrum, by signatures of a high rate of mass loss, and also by presence of a circular reflection nebula. According to these characteristics, the star can be considered as a possible pre-FUor star. Up to the present the photospheric spectrum of the star has not been recorded. In this work we analyze the high-resolution spectra of V1331 Cyg that were obtained by G.H. Herbig with the HIRES spectrograph at the Keck-1 telescope in 2004 and 2007. For the first time the numerous photospheric lines of the star have been detected and the spectral class has been estimated, viz., G7-K0 IV. It is revealed that the projection of the rotation velocity is lower than the width of instrumental profile (vsini < 6 km/s); this means that the angle between the stellar axis of rotation and the line of sight is small. The radial velocity of the star derived from the photospheric lines is RV = −15.0 ± 0.3 km/s. The difference in radial velocities for 2004 and 2007 is lower than the measurement error. The photospheric spectrum is veiled considerably, but the amount of veiling is not the same in different lines. This depends on the line strength in the template spectrum of the G7 IV star: in the weakest lines (EW = 5–10 mÅ in the template spectrum) VF ≈ 1 and it increases up to 4–5 in stronger lines. The Hα and Hβ lines demonstrate classical P Cyg profiles, which testifies to an intensive wind with a maximal velocity of about 400 km/s. In addition, the emission lines of Fe II, Mg I and K I and of several other elements are accompanied by a narrow blue-shifted absorption at −150...−250 km/s. The emission spectrum of V1331 Cyg is rich in the narrow (FWHM = 30–50 km/s) lines of neutral and ionized metals showing the excitation temperature T exc = 3800 ± 300 K. The stellar mass M* ≈ 2.8M and radius R* ≈ 5R are estimated.

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References

  • Beristain, G., Edwards, S., and Kwan, J., Astrophys. J., 1998, vol. 499, p. 828.

    Article  ADS  Google Scholar 

  • Bouvier, J., Alencar, S.H.P., Harries, T.J., Johns-Krull, C.M., and Romanova, M.M., in Protostars and Planets V, Reipurth, B., Jewitt, D., and Keil, K., Eds., Tuscon: Univ. Arizona Press, 2007, p. 479.

  • Cabrit, S., Edards, S., Strom, S.E., and Strom, K.M., Astrophys. J., 1990, vol. 354, p. 687.

    Article  ADS  Google Scholar 

  • Chavarria, K., Astron. Astrophys., 1981, vol. 101, no. 1, p. 105.

    ADS  Google Scholar 

  • Cohen, V. and Kuhi, L., Astron. Astrophys. Suppl. Ser., 1979, vol. 41, p. 743.

    Article  ADS  Google Scholar 

  • Dodin, A.V. and Lamzin, S.A., Astron. Lett., 2012, vol. 38, no. 10, p. 649.

    Article  ADS  Google Scholar 

  • Goodrich, R.W., Publ. Astron. Soc. Pacific, 1987, vol. 99, p. 16.

    Article  ADS  Google Scholar 

  • Guenter, H.M., Astron. Nachr., 2013, vol. 334, no. 1, p. 1.

    Google Scholar 

  • Hamann, F. and Persson, S.E., Astrophys. J., 1992, vol. 82, p. 247.

    Article  ADS  Google Scholar 

  • Hartigan, P., Edwards, S., and Ghandour, L., Astrophys. J., 1995, vol. 452, p. 736.

    Article  ADS  Google Scholar 

  • Hartmann, L. and Kenyon, S.J., Ann. Rev. Astron. Astrophys., 1996, vol. 34, p. 207.

    Article  ADS  Google Scholar 

  • Henning, Th., Burkert, A., Launhardt, R., Leinert, Ch., and Stecklum, B., Astron. Astrophys., 1998, vol. 336, p. 565.

    ADS  Google Scholar 

  • Herbig, G.H., Astrophys. J., 1977, vol. 217, no. 1, p. 693.

    Article  ADS  Google Scholar 

  • Herbig, G.H., Proc. ESO Workshop on Low Mass Star Formation and Pre-Main Sequence Objects, 1989, p. 233.

    Google Scholar 

  • Herbig, G.H., Astrophys. J., 1990, vol. 360, p. 639.

    Article  ADS  Google Scholar 

  • Herbig, G.H., Petrov, P.P., and Duemmler, R., Astrophys. J., 2003, vol. 595, p. 384.

    Article  ADS  Google Scholar 

  • Herbig, G.H., Astrophys. J., 2009, vol. 138, p. 448.

    ADS  Google Scholar 

  • Koenigl, A., Astrophys. J., 1991, vol. 370, p. L39.

    Article  ADS  Google Scholar 

  • Kolotilov, E.A., Pis’ma Astron. Zh., 1983, vol. 9, p. 552.

    ADS  Google Scholar 

  • Kuhi, L.V., Astrophys. J., 1964, vol. 140, p. 1409.

    Article  ADS  Google Scholar 

  • Kupka, F., Piskunov, N.E., Ryabchikova, T.A., Stempels, H.C., and Weiss, W.W., Astron. Astrophys. Suppl. Ser., 1999, vol. 138, p. 119.

    Article  ADS  Google Scholar 

  • Matt, S. and Pudritz, R.E., Astrophys. J., 2005, vol. 632, p. L135.

    Article  ADS  Google Scholar 

  • McMuldroch, S., Sargent, A.I., and Blake, G.A., Astrophys. J., 1993, vol. 106, p. 2477.

    ADS  Google Scholar 

  • Mundt, R., Appenzeller, I., Bertout, C., Krautter, J., and Chavarria, C., Astron. Astrophys., 1981, vol. 93, nos. 1–2, p. 412.

    ADS  Google Scholar 

  • Mundt, R., Astophys. J, 1984, vol. 280, p. 749.

    Article  ADS  Google Scholar 

  • Mundt, R. and Eisloffel, J., Astrophys. J., 1998, vol. 116, p. 860.

    ADS  Google Scholar 

  • Muzerolle, J., Calvet, N., and Hartmann, L., Astrophys. J., 2001, vol. 550, p. 944.

    Article  ADS  Google Scholar 

  • Petrov, P.P., Astrofizika, 2003, vol. 46, no. 4, p. 506.

    Google Scholar 

  • Petrov, P.P. and Herbig, G.H., Astron. J., 2008, vol. 136, p. 676.

    Article  ADS  Google Scholar 

  • Petrov, P.P., Gahm, G.F., Stempels, H.C., Walter, F.M., and Artemenko, S.A., Astron. Astrophys., 2011, vol. 535, p. 6.

    Article  ADS  Google Scholar 

  • Quanz, S.P., Apai, D., and Henning, Th., Astrophys. J., 2007, vol. 656, p. 287.

    Article  ADS  Google Scholar 

  • Shu, F., Najita, J., Ostriker, E., Wilkin, F., Ruden, S., and Lizano, S., Astrophys. J., 1994, vol. 429, no. 2, p. 781.

    Article  ADS  Google Scholar 

  • Siess, L., Dofur, E., and Forestini, M., Astron. Astrophys., 2000, vol. 358, p. 593.

    ADS  Google Scholar 

  • Welin, G., Astron. Astrophys., 1976, vol. 49, p. 145.

    ADS  Google Scholar 

  • Zaitseva, G.V., Peremen. Zvezdy, 1968, vol. 16, p. 435.

    ADS  Google Scholar 

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Correspondence to P. P. Petrov.

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Original Russian Text © P.P. Petrov, E.V. Babina, 2014, published in Izvestiya Krymskoi Astrofizicheskoi Observatorii, 2014, Vol. 110, pp. 5–15.

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Petrov, P.P., Babina, E.V. The photospheric spectrum of the pre-FUor V1331 CYG: Is it a star or a disk?. Bull.Crim. Astrophys. Observ. 110, 1–8 (2014). https://doi.org/10.3103/S0190271714010203

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  • DOI: https://doi.org/10.3103/S0190271714010203

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