We present International Ultraviolet Explorer (IUE) observations of the luminous, non- eclipsing, double lined spectroscopic binary system UX Ari over the period 1978-1996. Three spectra showing modulations in line fluxes at different times are presented. The ultraviolet spectra reveal emission lines originating in the chromosphere and transition region of the primary star. UX Ari has a periodic flaring activity in different wavelength bands each 7-9 years. The reddening of UX Ari determined from 2200 Å absorption feature to be E(B - V) = 0.14 ± 0.02. The calculated fluxes of CII 1335 Å , CIV 1550 Å & HeII 1640 Å emission lines showed a correlation with the orbital phase. The results confirmed that magnetic activity is the source and reason for emission lines and their changes. We determined the mass loss rate to be 10–6 M⨀ yr-1, the temperature of the emitting region is 104 K ± 220 K, and the ultraviolet luminosity is 8·1029 erg s-1. The results agree with the inhomogeneous gyro-synchrotron model.
Similar content being viewed by others
References
R. C. Carlo and D. M. Popper, Publ. Astron. Soc. Pacif., 83, 504, 1971.
B. Haisch, K. T. Strong, and M. Rodono, ARA&A, 29, 275, 1991.
C. J. Schrijver and C. Zwaan, Camb. Astrophys. Ser., 34, 2000.
B. R. Pettersen, Astron. Astrophys., 97, 199, 1989.
D. Garcia Alvarez, Irish, Astron. J., 27, 117, 2000.
D. P. Huenemoerder, D. L. Buzasi, and L. W. Ramsey, Astron. J., 98, 1398, 1989.
S. S. Vogt and A. P. Hatzes, IAUC, 130, 297, 1991.
F. Ekmekci, PASA, 27, 1, 2009.
C. A. Hummel, J. D. Monnier, E. M. Roettenbacher et al., Astrophys. J., 844, 115H, 2017.
P. M. Rodriguez-Pascual, R. R. Gonzalez, N. Schartel et al., Astron. Astrophys. Suppl., 139, 183R, 1999.
C. Dong-Tao and G. Sheng-Hong, RAA, 17, 6, 2017.
G. Zhao and H. B. Li, ChJAA, 1, 555, 2001.
T. Yohko, K. Yamazaki, Y. Sugawara et al., PASJ, 68, 90, 2016.
W. Iwakiri, R. Sasaki, K. Gendreau et al., ATel, 12248, 11, 2018.
F. Ekmekci, PASA, 27, 1E, 2010.
S. -H. Gu, H. -S. Tan, H. -G. Shan et al., Astron. Astrophys., 388, 889, 2002.
R. G. Athay, Astrophys. J., 142, 755, 1965.
C. Jordan, Mon. Not. Roy. Astron. Soc., 170, 429, 1975.
H. Zirin, Astrophys. J., 208, 414, 1976.
M. Rego, R. R. Gonzalez, and M. J. Fernández-Figueroa, Astron. Astrophys., 119, 227, 1983.
V. Aarum Ulvas and O. Engvold, Astron. Astrophys., 399, L11, 2003a.
A. M. Geller, E. M. Leiner, A. Bellini et al., arXiv:1703. 10167, 2017.
E. Leiner, R. D. Mathieu, A. M. Geller, arXiv:1703. 10181, 2017.
R. L. Mutel, D. H. Morris, D. J. Doiron et al., Astron. J., 93, 1220, 1987.
V. Aarum Ulvas and O. Engvold, Astron. Astrophys., 402, 1043, 2003b.
H. Nieuwenhuizen and C. de Jager, Astron. Astrophys., 231, 134, 1990.
Author information
Authors and Affiliations
Corresponding author
Additional information
Published in Astrofizika, Vol. 64, No. 3, pp. 357-368 (August 2021).
Rights and permissions
About this article
Cite this article
Sanad, M.R., Zead, I. & Abdel-Sabour, M.A. Ultraviolet Spectral Behavior of UX Ari with Periodic Flaring Activity. Astrophysics 64, 316–326 (2021). https://doi.org/10.1007/s10511-021-09692-1
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10511-021-09692-1